ast.d

// Written in the D programming language.

/**
 * This module defines an Abstract Syntax Tree for the D language
 *
 * Examples:
 * ---
 * // TODO
 * ---
 *
 * Copyright: Brian Schott 2013
 * License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt Boost, License 1.0)
 * Authors: Brian Schott
 */

module dparse.ast;

import dparse.lexer;
import std.algorithm;
import std.array;
import std.string;
import std.traits;

private immutable uint[TypeInfo] typeMap;

shared static this()
{
    typeMap[typeid(AddExpression)] = 1;
    typeMap[typeid(AndAndExpression)] = 2;
    typeMap[typeid(AndExpression)] = 3;
    typeMap[typeid(AsmAddExp)] = 4;
    typeMap[typeid(AsmAndExp)] = 5;
    typeMap[typeid(AsmBrExp)] = 6;
    typeMap[typeid(AsmExp)] = 7;
    typeMap[typeid(AsmEqualExp)] = 8;
    typeMap[typeid(AsmLogAndExp)] = 9;
    typeMap[typeid(AsmLogOrExp)] = 10;
    typeMap[typeid(AsmMulExp)] = 11;
    typeMap[typeid(AsmOrExp)] = 12;
    typeMap[typeid(AsmRelExp)] = 13;
    typeMap[typeid(AsmUnaExp)] = 14;
    typeMap[typeid(AsmShiftExp)] = 15;
    typeMap[typeid(AsmXorExp)] = 16;
    typeMap[typeid(AssertExpression)] = 17;
    typeMap[typeid(AssignExpression)] = 18;
    typeMap[typeid(CmpExpression)] = 19;
    typeMap[typeid(DeleteExpression)] = 20;
    typeMap[typeid(EqualExpression)] = 21;
    typeMap[typeid(Expression)] = 22;
    typeMap[typeid(FunctionCallExpression)] = 23;
    typeMap[typeid(FunctionLiteralExpression)] = 24;
    typeMap[typeid(IdentityExpression)] = 25;
    typeMap[typeid(ImportExpression)] = 26;
    typeMap[typeid(IndexExpression)] = 27;
    typeMap[typeid(InExpression)] = 28;
    typeMap[typeid(IsExpression)] = 29;
    typeMap[typeid(MixinExpression)] = 30;
    typeMap[typeid(MulExpression)] = 31;
    typeMap[typeid(NewAnonClassExpression)] = 32;
    typeMap[typeid(NewExpression)] = 33;
    typeMap[typeid(OrExpression)] = 34;
    typeMap[typeid(OrOrExpression)] = 35;
    typeMap[typeid(PowExpression)] = 36;
    typeMap[typeid(PragmaExpression)] = 37;
    typeMap[typeid(PrimaryExpression)] = 38;
    typeMap[typeid(RelExpression)] = 39;
    typeMap[typeid(ShiftExpression)] = 40;
    typeMap[typeid(Index)] = 41;
    typeMap[typeid(TemplateMixinExpression)] = 42;
    typeMap[typeid(TernaryExpression)] = 43;
    typeMap[typeid(TraitsExpression)] = 44;
    typeMap[typeid(TypeidExpression)] = 45;
    typeMap[typeid(TypeofExpression)] = 46;
    typeMap[typeid(UnaryExpression)] = 47;
    typeMap[typeid(XorExpression)] = 48;
    typeMap[typeid(InterpolatedStringExpression)] = 49;
    typeMap[typeid(InterpolatedStringText)] = 50;
}

/// Describes which syntax was used in a list of declarations in the containing AST node
enum DeclarationListStyle : ubyte
{
    /// A declaration directly after the containing AST node making it the only child
    single,
    /// A colon (`:`) was used in the containing AST node meaning all following declarations are part here.
    colon,
    /// The declarations have been specified in a block denoted by starting `{` and ending `}` tokens.
    block
}

/**
 * Implements the $(LINK2 http://en.wikipedia.org/wiki/Visitor_pattern, Visitor Pattern)
 * for the various AST classes
 */
abstract class ASTVisitor
{
    deprecated("Don't use or override visit(ExpressionNode). For usage: dynamicDispatch(ExpressionNode) is equivalent; "
        ~ "for overriding: you should probably override more specific cases. If you need to override to inject some "
        ~ "before/after code for all cases, make sure to call `super.dynamicDispatch(n)` instead of `n.accept(this)`!")
    void visit(const ExpressionNode n)
    {
        dynamicDispatch(n);
    }

    /**
     * Looks at the runtime type of `n`, then calls the appropriate `visit`
     * method at runtime.
     *
     * Rule of thumb: when the type is an abstract class, use `dynamicDispatch`,
     * otherwise use `visit`.
     *
     * For templated calls:
     * ---
     * static if (__traits(isAbstractClass, typeof(node)))
     *   visitor.dynamicDispatch(node);
     * else
     *   visitor.visit(node);
     * ---
     */
    void dynamicDispatch(const ExpressionNode n)
    {
        switch (typeMap.get(typeid(n), 0))
        {
        case 1: visit(cast(AddExpression) n); break;
        case 2: visit(cast(AndAndExpression) n); break;
        case 3: visit(cast(AndExpression) n); break;
        case 4: visit(cast(AsmAddExp) n); break;
        case 5: visit(cast(AsmAndExp) n); break;
        case 6: visit(cast(AsmBrExp) n); break;
        case 7: visit(cast(AsmExp) n); break;
        case 8: visit(cast(AsmEqualExp) n); break;
        case 9: visit(cast(AsmLogAndExp) n); break;
        case 10: visit(cast(AsmLogOrExp) n); break;
        case 11: visit(cast(AsmMulExp) n); break;
        case 12: visit(cast(AsmOrExp) n); break;
        case 13: visit(cast(AsmRelExp) n); break;
        case 14: visit(cast(AsmUnaExp) n); break;
        case 15: visit(cast(AsmShiftExp) n); break;
        case 16: visit(cast(AsmXorExp) n); break;
        case 17: visit(cast(AssertExpression) n); break;
        case 18: visit(cast(AssignExpression) n); break;
        case 19: visit(cast(CmpExpression) n); break;
        case 20: visit(cast(DeleteExpression) n); break;
        case 21: visit(cast(EqualExpression) n); break;
        case 22: visit(cast(Expression) n); break;
        case 23: visit(cast(FunctionCallExpression) n); break;
        case 24: visit(cast(FunctionLiteralExpression) n); break;
        case 25: visit(cast(IdentityExpression) n); break;
        case 26: visit(cast(ImportExpression) n); break;
        case 27: visit(cast(IndexExpression) n); break;
        case 28: visit(cast(InExpression) n); break;
        case 29: visit(cast(IsExpression) n); break;
        case 30: visit(cast(MixinExpression) n); break;
        case 31: visit(cast(MulExpression) n); break;
        case 32: visit(cast(NewAnonClassExpression) n); break;
        case 33: visit(cast(NewExpression) n); break;
        case 34: visit(cast(OrExpression) n); break;
        case 35: visit(cast(OrOrExpression) n); break;
        case 36: visit(cast(PowExpression) n); break;
        case 37: visit(cast(PragmaExpression) n); break;
        case 38: visit(cast(PrimaryExpression) n); break;
        case 39: visit(cast(RelExpression) n); break;
        case 40: visit(cast(ShiftExpression) n); break;
        case 41: visit(cast(Index) n); break;
        case 42: visit(cast(TemplateMixinExpression) n); break;
        case 43: visit(cast(TernaryExpression) n); break;
        case 44: visit(cast(TraitsExpression) n); break;
        case 45: visit(cast(TypeidExpression) n); break;
        case 46: visit(cast(TypeofExpression) n); break;
        case 47: visit(cast(UnaryExpression) n); break;
        case 48: visit(cast(XorExpression) n); break;
        // skip 49, 50 (used for InterpolatedStringPart)
        default: assert(false, __MODULE__ ~ " has a bug");
        }
    }

    /// ditto
    void dynamicDispatch(const InterpolatedStringPart n)
    {
        switch (typeMap.get(typeid(n), 0))
        {
        case 49: visit(cast(InterpolatedStringExpression) n); break;
        case 50: visit(cast(InterpolatedStringText) n); break;
        default: assert(false, __MODULE__ ~ " has a bug");
        }
    }

    /** */ void visit(const AddExpression addExpression) { addExpression.accept(this); }
    /** */ void visit(const AliasDeclaration aliasDeclaration) { aliasDeclaration.accept(this); }
    /** */ void visit(const AliasAssign aliasAssign) { aliasAssign.accept(this); }
    /** */ void visit(const AliasInitializer aliasInitializer) { aliasInitializer.accept(this); }
    /** */ void visit(const AliasThisDeclaration aliasThisDeclaration) { aliasThisDeclaration.accept(this); }
    /** */ void visit(const AlignAttribute alignAttribute) { alignAttribute.accept(this); }
    /** */ void visit(const AndAndExpression andAndExpression) { andAndExpression.accept(this); }
    /** */ void visit(const AndExpression andExpression) { andExpression.accept(this); }
    /** */ void visit(const AnonymousEnumDeclaration anonymousEnumDeclaration) { anonymousEnumDeclaration.accept(this); }
    /** */ void visit(const AnonymousEnumMember anonymousEnumMember) { anonymousEnumMember.accept(this); }
    /** */ void visit(const ArgumentList argumentList) { argumentList.accept(this); }
    /** */ void visit(const Arguments arguments) { arguments.accept(this); }
    /** */ void visit(const ArrayInitializer arrayInitializer) { arrayInitializer.accept(this); }
    /** */ void visit(const ArrayLiteral arrayLiteral) { arrayLiteral.accept(this); }
    /** */ void visit(const ArrayMemberInitialization arrayMemberInitialization) { arrayMemberInitialization.accept(this); }
    /** */ void visit(const AsmAddExp asmAddExp) { asmAddExp.accept(this); }
    /** */ void visit(const AsmAndExp asmAndExp) { asmAndExp.accept(this); }
    /** */ void visit(const AsmBrExp asmBrExp) { asmBrExp.accept(this); }
    /** */ void visit(const AsmEqualExp asmEqualExp) { asmEqualExp.accept(this); }
    /** */ void visit(const AsmExp asmExp) { asmExp.accept(this); }
    /** */ void visit(const AsmInstruction asmInstruction) { asmInstruction.accept(this); }
    /** */ void visit(const AsmLogAndExp asmLogAndExp) { asmLogAndExp.accept(this); }
    /** */ void visit(const AsmLogOrExp asmLogOrExp) { asmLogOrExp.accept(this); }
    /** */ void visit(const AsmMulExp asmMulExp) { asmMulExp.accept(this); }
    /** */ void visit(const AsmOrExp asmOrExp) { asmOrExp.accept(this); }
    /** */ void visit(const AsmPrimaryExp asmPrimaryExp) { asmPrimaryExp.accept(this); }
    /** */ void visit(const AsmRelExp asmRelExp) { asmRelExp.accept(this); }
    /** */ void visit(const AsmShiftExp asmShiftExp) { asmShiftExp.accept(this); }
    /** */ void visit(const AsmStatement asmStatement) { asmStatement.accept(this); }
    /** */ void visit(const AsmTypePrefix asmTypePrefix) { asmTypePrefix.accept(this); }
    /** */ void visit(const AsmUnaExp asmUnaExp) { asmUnaExp.accept(this); }
    /** */ void visit(const AsmXorExp asmXorExp) { asmXorExp.accept(this); }
    /** */ void visit(const AssertArguments assertArguments) { assertArguments.accept(this); }
    /** */ void visit(const AssertExpression assertExpression) { assertExpression.accept(this); }
    /** */ void visit(const AssignExpression assignExpression) { assignExpression.accept(this); }
    /** */ void visit(const AssocArrayLiteral assocArrayLiteral) { assocArrayLiteral.accept(this); }
    /** */ void visit(const AtAttribute atAttribute) { atAttribute.accept(this); }
    /** */ void visit(const Attribute attribute) { attribute.accept(this); }
    /** */ void visit(const AttributeDeclaration attributeDeclaration) { attributeDeclaration.accept(this); }
    /** */ void visit(const AutoDeclaration autoDeclaration) { autoDeclaration.accept(this); }
    /** */ void visit(const AutoDeclarationPart autoDeclarationPart) { autoDeclarationPart.accept(this); }
    /** */ void visit(const BlockStatement blockStatement) { blockStatement.accept(this); }
    /** */ void visit(const BreakStatement breakStatement) { breakStatement.accept(this); }
    /** */ void visit(const BaseClass baseClass) { baseClass.accept(this); }
    /** */ void visit(const BaseClassList baseClassList) { baseClassList.accept(this); }
    /** */ void visit(const BitfieldWidth bitfieldWidth) { bitfieldWidth.accept(this); }
    /** */ void visit(const CaseRangeStatement caseRangeStatement) { caseRangeStatement.accept(this); }
    /** */ void visit(const CaseStatement caseStatement) { caseStatement.accept(this); }
    /** */ void visit(const CastExpression castExpression) { castExpression.accept(this); }
    /** */ void visit(const CastQualifier castQualifier) { castQualifier.accept(this); }
    /** */ void visit(const Catch catch_) { catch_.accept(this); }
    /** */ void visit(const Catches catches) { catches.accept(this); }
    /** */ void visit(const ClassDeclaration classDeclaration) { classDeclaration.accept(this); }
    /** */ void visit(const CmpExpression cmpExpression) { cmpExpression.accept(this); }
    /** */ void visit(const CompileCondition compileCondition) { compileCondition.accept(this); }
    /** */ void visit(const ConditionalDeclaration conditionalDeclaration) { conditionalDeclaration.accept(this); }
    /** */ void visit(const ConditionalStatement conditionalStatement) { conditionalStatement.accept(this); }
    /** */ void visit(const Constraint constraint) { constraint.accept(this); }
    /** */ void visit(const Constructor constructor) { constructor.accept(this); }
    /** */ void visit(const ContinueStatement continueStatement) { continueStatement.accept(this); }
    /** */ void visit(const DebugCondition debugCondition) { debugCondition.accept(this); }
    /** */ void visit(const DebugSpecification debugSpecification) { debugSpecification.accept(this); }
    /** */ void visit(const Declaration declaration) { declaration.accept(this); }
    /** */ void visit(const DeclarationOrStatement declarationsOrStatement) { declarationsOrStatement.accept(this); }
    /** */ void visit(const DeclarationsAndStatements declarationsAndStatements) { declarationsAndStatements.accept(this); }
    /** */ void visit(const Declarator declarator) { declarator.accept(this); }
    /** */ void visit(const DefaultStatement defaultStatement) { defaultStatement.accept(this); }
    /** */ void visit(const DeleteExpression deleteExpression) { deleteExpression.accept(this); }
    /** */ void visit(const DeleteStatement deleteStatement) { deleteStatement.accept(this); }
    /** */ void visit(const Deprecated deprecated_) { deprecated_.accept(this); }
    /** */ void visit(const Destructor destructor) { destructor.accept(this); }
    /** */ void visit(const DoStatement doStatement) { doStatement.accept(this); }
    /** */ void visit(const EnumBody enumBody) { enumBody.accept(this); }
    /** */ void visit(const EnumDeclaration enumDeclaration) { enumDeclaration.accept(this); }
    /** */ void visit(const EnumMember enumMember) { enumMember.accept(this); }
    /** */ void visit(const EnumMemberAttribute enumMemberAttribute) { enumMemberAttribute.accept(this); }
    /** */ void visit(const EponymousTemplateDeclaration eponymousTemplateDeclaration) { eponymousTemplateDeclaration.accept(this); }
    /** */ void visit(const EqualExpression equalExpression) { equalExpression.accept(this); }
    /** */ void visit(const Expression expression) { expression.accept(this); }
    /** */ void visit(const ExpressionStatement expressionStatement) { expressionStatement.accept(this); }
    /** */ void visit(const FinalSwitchStatement finalSwitchStatement) { finalSwitchStatement.accept(this); }
    /** */ void visit(const Finally finally_) { finally_.accept(this); }
    /** */ void visit(const ForStatement forStatement) { forStatement.accept(this); }
    /** */ void visit(const ForeachStatement foreachStatement) { foreachStatement.accept(this); }
    /** */ void visit(const StaticForeachDeclaration staticForeachDeclaration) { staticForeachDeclaration.accept(this); }
    /** */ void visit(const StaticForeachStatement staticForeachStatement) { staticForeachStatement.accept(this); }
    /** */ void visit(const ForeachType foreachType) { foreachType.accept(this); }
    /** */ void visit(const ForeachTypeList foreachTypeList) { foreachTypeList.accept(this); }
    /** */ void visit(const FunctionAttribute functionAttribute) { functionAttribute.accept(this); }
    /** */ void visit(const FunctionBody functionBody) { functionBody.accept(this); }
    /** */ void visit(const FunctionCallExpression functionCallExpression) { functionCallExpression.accept(this); }
    /** */ void visit(const FunctionContract functionContract) { functionContract.accept(this); }
    /** */ void visit(const FunctionDeclaration functionDeclaration) { functionDeclaration.accept(this); }
    /** */ void visit(const FunctionLiteralExpression functionLiteralExpression) { functionLiteralExpression.accept(this); }
    /** */ void visit(const GccAsmInstruction gccAsmInstruction) { gccAsmInstruction.accept(this); }
    /** */ void visit(const GccAsmOperandList gccAsmOperands) { gccAsmOperands.accept(this); }
    /** */ void visit(const GccAsmOperand gccAsmOperand) { gccAsmOperand.accept(this); }
    /** */ void visit(const GotoStatement gotoStatement) { gotoStatement.accept(this); }
    /** */ void visit(const IdentifierChain identifierChain) { identifierChain.accept(this); }
    /** */ void visit(const DeclaratorIdentifierList identifierList) { identifierList.accept(this); }
    /** */ void visit(const IdentifierOrTemplateChain identifierOrTemplateChain) { identifierOrTemplateChain.accept(this); }
    /** */ void visit(const IdentifierOrTemplateInstance identifierOrTemplateInstance) { identifierOrTemplateInstance.accept(this); }
    /** */ void visit(const IdentityExpression identityExpression) { identityExpression.accept(this); }
    /** */ void visit(const IfStatement ifStatement) { ifStatement.accept(this); }
    /** */ void visit(const IfCondition ifCondition) { ifCondition.accept(this); }
    /** */ void visit(const ImportBind importBind) { importBind.accept(this); }
    /** */ void visit(const ImportBindings importBindings) { importBindings.accept(this); }
    /** */ void visit(const ImportDeclaration importDeclaration) { importDeclaration.accept(this); }
    /** */ void visit(const ImportExpression importExpression) { importExpression.accept(this); }
    /** */ void visit(const IndexExpression indexExpression) { indexExpression.accept(this); }
    /** */ void visit(const InContractExpression inContractExpression) { inContractExpression.accept(this); }
    /** */ void visit(const InExpression inExpression) { inExpression.accept(this); }
    /** */ void visit(const InOutContractExpression inOutContractExpression) { inOutContractExpression.accept(this); }
    /** */ void visit(const InOutStatement inOutStatement) { inOutStatement.accept(this); }
    /** */ void visit(const InStatement inStatement) { inStatement.accept(this); }
    /** */ void visit(const Initialize initialize) { initialize.accept(this); }
    /** */ void visit(const Initializer initializer) { initializer.accept(this); }
    /** */ void visit(const InterfaceDeclaration interfaceDeclaration) { interfaceDeclaration.accept(this); }
    /** */ void visit(const InterpolatedString interpolatedString) { interpolatedString.accept(this); }
    /** */ void visit(const InterpolatedStringExpression interpolatedStringExpression) { interpolatedStringExpression.accept(this); }
    /** */ void visit(const InterpolatedStringText interpolatedStringText) { interpolatedStringText.accept(this); }
    /** */ void visit(const Invariant invariant_) { invariant_.accept(this); }
    /** */ void visit(const IsExpression isExpression) { isExpression.accept(this); }
    /** */ void visit(const KeyValuePair keyValuePair) { keyValuePair.accept(this); }
    /** */ void visit(const KeyValuePairs keyValuePairs) { keyValuePairs.accept(this); }
    /** */ void visit(const LabeledStatement labeledStatement) { labeledStatement.accept(this); }
    /** */ void visit(const LastCatch lastCatch) { lastCatch.accept(this); }
    /** */ void visit(const LinkageAttribute linkageAttribute) { linkageAttribute.accept(this); }
    /** */ void visit(const MemberFunctionAttribute memberFunctionAttribute) { memberFunctionAttribute.accept(this); }
    /** */ void visit(const MissingFunctionBody missingFunctionBody) { missingFunctionBody.accept(this); }
    /** */ void visit(const MixinDeclaration mixinDeclaration) { mixinDeclaration.accept(this); }
    /** */ void visit(const MixinExpression mixinExpression) { mixinExpression.accept(this); }
    /** */ void visit(const MixinTemplateDeclaration mixinTemplateDeclaration) { mixinTemplateDeclaration.accept(this); }
    /** */ void visit(const MixinTemplateName mixinTemplateName) { mixinTemplateName.accept(this); }
    /** */ void visit(const Module module_) { module_.accept(this); }
    /** */ void visit(const ModuleDeclaration moduleDeclaration) { moduleDeclaration.accept(this); }
    /** */ void visit(const MulExpression mulExpression) { mulExpression.accept(this); }
    /** */ void visit(const NamedArgument argument) { argument.accept(this); }
    /** */ void visit(const NamedArgumentList argument) { argument.accept(this); }
    /** */ void visit(const NamedTemplateArgumentList namedTemplateArgumentList) { namedTemplateArgumentList.accept(this); }
    /** */ void visit(const NamedTemplateArgument namedTemplateArgument) { namedTemplateArgument.accept(this); }
    /** */ void visit(const NamespaceList namespaceList) { namespaceList.accept(this); }
    /** */ void visit(const NewAnonClassExpression newAnonClassExpression) { newAnonClassExpression.accept(this); }
    /** */ void visit(const NewExpression newExpression) { newExpression.accept(this); }
    /** */ void visit(const NonVoidInitializer nonVoidInitializer) { nonVoidInitializer.accept(this); }
    /** */ void visit(const Operands operands) { operands.accept(this); }
    /** */ void visit(const OrExpression orExpression) { orExpression.accept(this); }
    /** */ void visit(const OrOrExpression orOrExpression) { orOrExpression.accept(this); }
    /** */ void visit(const OutContractExpression outContractExpression) { outContractExpression.accept(this); }
    /** */ void visit(const OutStatement outStatement) { outStatement.accept(this); }
    /** */ void visit(const ParameterAttribute parameterAttribute) { parameterAttribute.accept(this); }
    /** */ void visit(const Parameter parameter) { parameter.accept(this); }
    /** */ void visit(const Parameters parameters) { parameters.accept(this); }
    /** */ void visit(const Postblit postblit) { postblit.accept(this); }
    /** */ void visit(const PowExpression powExpression) { powExpression.accept(this); }
    /** */ void visit(const PragmaDeclaration pragmaDeclaration) { pragmaDeclaration.accept(this); }
    /** */ void visit(const PragmaStatement pragmaStatement) { pragmaStatement.accept(this); }
    /** */ void visit(const PragmaExpression pragmaExpression) { pragmaExpression.accept(this); }
    /** */ void visit(const PrimaryExpression primaryExpression) { primaryExpression.accept(this); }
    /** */ void visit(const Register register) { register.accept(this); }
    /** */ void visit(const RelExpression relExpression) { relExpression.accept(this); }
    /** */ void visit(const ReturnStatement returnStatement) { returnStatement.accept(this); }
    /** */ void visit(const ScopeGuardStatement scopeGuardStatement) { scopeGuardStatement.accept(this); }
    /** */ void visit(const SharedStaticConstructor sharedStaticConstructor) { sharedStaticConstructor.accept(this); }
    /** */ void visit(const SharedStaticDestructor sharedStaticDestructor) { sharedStaticDestructor.accept(this); }
    /** */ void visit(const ShiftExpression shiftExpression) { shiftExpression.accept(this); }
    /** */ void visit(const ShortenedFunctionBody shortenedFunctionBody) { shortenedFunctionBody.accept(this); }
    /** */ void visit(const SingleImport singleImport) { singleImport.accept(this); }
    /** */ void visit(const Index index) { index.accept(this); }
    /** */ void visit(const SpecifiedFunctionBody specifiedFunctionBody) { specifiedFunctionBody.accept(this); }
    /** */ void visit(const Statement statement) { statement.accept(this); }
    /** */ void visit(const StatementNoCaseNoDefault statementNoCaseNoDefault) { statementNoCaseNoDefault.accept(this); }
    /** */ void visit(const StaticAssertDeclaration staticAssertDeclaration) { staticAssertDeclaration.accept(this); }
    /** */ void visit(const StaticAssertStatement staticAssertStatement) { staticAssertStatement.accept(this); }
    /** */ void visit(const StaticConstructor staticConstructor) { staticConstructor.accept(this); }
    /** */ void visit(const StaticDestructor staticDestructor) { staticDestructor.accept(this); }
    /** */ void visit(const StaticIfCondition staticIfCondition) { staticIfCondition.accept(this); }
    /** */ void visit(const StorageClass storageClass) { storageClass.accept(this); }
    /** */ void visit(const StringLiteralList stringLiteralList) { stringLiteralList.accept(this); }
    /** */ void visit(const StructBody structBody) { structBody.accept(this); }
    /** */ void visit(const StructDeclaration structDeclaration) { structDeclaration.accept(this); }
    /** */ void visit(const StructInitializer structInitializer) { structInitializer.accept(this); }
    /** */ void visit(const StructMemberInitializer structMemberInitializer) { structMemberInitializer.accept(this); }
    /** */ void visit(const StructMemberInitializers structMemberInitializers) { structMemberInitializers.accept(this); }
    /** */ void visit(const SwitchStatement switchStatement) { switchStatement.accept(this); }
    /** */ void visit(const Symbol symbol) { symbol.accept(this); }
    /** */ void visit(const SynchronizedStatement synchronizedStatement) { synchronizedStatement.accept(this); }
    /** */ void visit(const TemplateAliasParameter templateAliasParameter) { templateAliasParameter.accept(this); }
    /** */ void visit(const TemplateArgument templateArgument) { templateArgument.accept(this); }
    /** */ void visit(const TemplateArgumentList templateArgumentList) { templateArgumentList.accept(this); }
    /** */ void visit(const TemplateArguments templateArguments) { templateArguments.accept(this); }
    /** */ void visit(const TemplateDeclaration templateDeclaration) { templateDeclaration.accept(this); }
    /** */ void visit(const TemplateInstance templateInstance) { templateInstance.accept(this); }
    /** */ void visit(const TemplateMixinExpression templateMixinExpression) { templateMixinExpression.accept(this); }
    /** */ void visit(const TemplateParameter templateParameter) { templateParameter.accept(this); }
    /** */ void visit(const TemplateParameterList templateParameterList) { templateParameterList.accept(this); }
    /** */ void visit(const TemplateParameters templateParameters) { templateParameters.accept(this); }
    /** */ void visit(const TemplateSingleArgument templateSingleArgument) { templateSingleArgument.accept(this); }
    /** */ void visit(const TemplateThisParameter templateThisParameter) { templateThisParameter.accept(this); }
    /** */ void visit(const TemplateTupleParameter templateTupleParameter) { templateTupleParameter.accept(this); }
    /** */ void visit(const TemplateTypeParameter templateTypeParameter) { templateTypeParameter.accept(this); }
    /** */ void visit(const TemplateValueParameter templateValueParameter) { templateValueParameter.accept(this); }
    /** */ void visit(const TemplateValueParameterDefault templateValueParameterDefault) { templateValueParameterDefault.accept(this); }
    /** */ void visit(const TernaryExpression ternaryExpression) { ternaryExpression.accept(this); }
    /** */ void visit(const ThrowExpression throwExpression) { throwExpression.accept(this); }
    /** */ void visit(const Token) { }
    /** */ void visit(const TraitsExpression traitsExpression) { traitsExpression.accept(this); }
    /** */ void visit(const TryStatement tryStatement) { tryStatement.accept(this); }
    /** */ void visit(const Type type) { type.accept(this); }
    /** */ void visit(const TypeIdentifierPart typeIdentChain) { typeIdentChain.accept(this); }
    /** */ void visit(const Type2 type2) { type2.accept(this); }
    /** */ void visit(const TypeSpecialization typeSpecialization) { typeSpecialization.accept(this); }
    /** */ void visit(const TypeSuffix typeSuffix) { typeSuffix.accept(this); }
    /** */ void visit(const TypeidExpression typeidExpression) { typeidExpression.accept(this); }
    /** */ void visit(const TypeofExpression typeofExpression) { typeofExpression.accept(this); }
    /** */ void visit(const UnaryExpression unaryExpression) { unaryExpression.accept(this); }
    /** */ void visit(const UnionDeclaration unionDeclaration) { unionDeclaration.accept(this); }
    /** */ void visit(const Unittest unittest_) { unittest_.accept(this); }
    /** */ void visit(const VariableDeclaration variableDeclaration) { variableDeclaration.accept(this); }
    /** */ void visit(const Vector vector) { vector.accept(this); }
    /** */ void visit(const VersionCondition versionCondition) { versionCondition.accept(this); }
    /** */ void visit(const VersionSpecification versionSpecification) { versionSpecification.accept(this); }
    /** */ void visit(const WhileStatement whileStatement) { whileStatement.accept(this); }
    /** */ void visit(const WithStatement withStatement) { withStatement.accept(this); }
    /** */ void visit(const XorExpression xorExpression) { xorExpression.accept(this); }
}

interface ASTNode
{
    /** */ void accept(ASTVisitor visitor) const;
}

template visitIfNotNull(fields ...)
{
    static if (fields.length > 1)
        immutable visitIfNotNull = visitIfNotNull!(fields[0]) ~ visitIfNotNull!(fields[1..$]);
    else
    {
        static if (typeof(fields[0]).stringof[$ - 2 .. $] == "[]")
        {
            static if (__traits(isAbstractClass, typeof(fields[0][0])))
                immutable visitIfNotNull = "foreach (i; " ~ fields[0].stringof ~ ") if (i !is null) visitor.dynamicDispatch(i);\n";
            else static if (__traits(hasMember, typeof(fields[0][0]), "classinfo"))
                immutable visitIfNotNull = "foreach (i; " ~ fields[0].stringof ~ ") if (i !is null) visitor.visit(i);\n";
            else
                immutable visitIfNotNull = "foreach (i; " ~ fields[0].stringof ~ ") visitor.visit(i);\n";
        }
        else static if (__traits(isAbstractClass, typeof(fields[0])))
            immutable visitIfNotNull = "if (" ~ fields[0].stringof ~ " !is null) visitor.dynamicDispatch(" ~ fields[0].stringof ~ ");\n";
        else static if (__traits(hasMember, typeof(fields[0]), "classinfo"))
            immutable visitIfNotNull = "if (" ~ fields[0].stringof ~ " !is null) visitor.visit(" ~ fields[0].stringof ~ ");\n";
        else static if (is(Unqual!(typeof(fields[0])) == Token))
            immutable visitIfNotNull = "if (" ~ fields[0].stringof ~ ` != tok!""` ~ ") visitor.visit(" ~ fields[0].stringof ~ ");\n";
        else
            immutable visitIfNotNull = "visitor.visit(" ~ fields[0].stringof ~ ");\n";
    }
}

private mixin template OpEquals(extraFields...)
{
    override bool opEquals(Object other) const
    {
        if (auto obj = cast(typeof(this)) other)
        {
            foreach (i, field; this.tupleof)
            {
                if (typeof(this).tupleof[i].stringof.among(
                    "comment", "line", "column", "endLocation", "startLocation",
                    "index", "dotLocation"
                ))
                    continue;

                if (field != obj.tupleof[i])
                    return false;
            }
            static foreach (field; extraFields)
                if (mixin("this." ~ field ~ " != obj." ~ field))
                    return false;
            return true;
        }
        return false;
    }
}

unittest
{
    auto lhs = new AddExpression();
    auto rhs = new AddExpression();
    assert(lhs == rhs);
    lhs.line = 4;
    assert(lhs == rhs);
    lhs.operator = tok!"-";
    assert(lhs != rhs);
    rhs.operator = tok!"-";
    assert(lhs == rhs);
}

unittest
{
    auto lhs = new AssertArguments();
    auto rhs = new AssertArguments();
    lhs.assertion = new AddExpression();
    rhs.assertion = new AddExpression();
    lhs.messageParts = [new NewExpression(), new AddExpression()];
    rhs.messageParts = [new NewExpression(), new AddExpression()];
    assert(lhs == rhs);
    lhs.messageParts = [new NewExpression(), new AddExpression()];
    rhs.messageParts = [new AddExpression(), new NewExpression()];
    assert(lhs != rhs);
}

abstract class BaseNode : ASTNode
{
    /** List of tokens consumed by this AST node */ const(Token)[] tokens;

    abstract void accept(ASTVisitor visitor) const;
}

abstract class ExpressionNode : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        assert (false);
    }
}

mixin template BinaryExpressionBody()
{
    ExpressionNode left;
    ExpressionNode right;
    size_t line;
    size_t column;
}

///
final class AddExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin OpEquals;
    /** */ IdType operator;
    mixin BinaryExpressionBody;
}

///
final class AliasDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(storageClasses, type, declaratorIdentifierList,
            initializers, parameters, memberFunctionAttributes));
    }
    mixin OpEquals;
    /** Old syntax `storageClasses type declaratorIdentifierList` */
    StorageClass[] storageClasses;
    /** ditto */
    Type type;
    /** ditto */
    DeclaratorIdentifierList declaratorIdentifierList;
    /** New syntax e.g. `ident = Type` */
    AliasInitializer[] initializers;
    /** */ string comment;
    /** Old syntax `(parameters) memberFunctionAttributes` after a single identifier */
    Parameters parameters;
    /** ditto */
    MemberFunctionAttribute[] memberFunctionAttributes;
}

///
final class AliasAssign : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, type));
    }
    mixin OpEquals;
    /** */ Token identifier;
    /** */ Type type;
    /** */ string comment;
}

/**
 * `name(templateParameters)`
 * * `= storageClasses type`
 * * `= storageClasses type(parameters) memberFunctionAttributes`
 * * `= functionLiteralExpression`
 */
final class AliasInitializer : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(name, templateParameters, storageClasses, type,
                functionLiteralExpression));
    }
    mixin OpEquals;
    /** */ Token name;
    /** */ StorageClass[] storageClasses;
    /** */ TemplateParameters templateParameters;
    /** */ Type type;
    /** */ FunctionLiteralExpression functionLiteralExpression;
    /** */ Parameters parameters;
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
}

///
final class AliasThisDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier));
    }
    mixin OpEquals;
    /** */ Token identifier;
    /** */ string comment;
}

///
final class AlignAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assignExpression));
    }
    mixin OpEquals;
    /** */ ExpressionNode assignExpression;
}

///
final class AndAndExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin OpEquals;
    mixin BinaryExpressionBody;
}

///
final class AndExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin OpEquals;
    mixin BinaryExpressionBody;
}

///
final class AnonymousEnumDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(baseType, members));
    }
    mixin OpEquals;
    /** */ Type baseType;
    /** */ AnonymousEnumMember[] members;
}

///
final class AnonymousEnumMember : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, name, assignExpression));
    }
    /** */ Type type;
    /** */ Token name;
    /** */ ExpressionNode assignExpression;
    /** */ string comment;
}

///
final class NamedArgument : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(name, assignExpression));
    }
    mixin OpEquals;
    /** */ Token name;
    /** */ ExpressionNode assignExpression;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
}

///
final class NamedArgumentList : BaseNode
{
	override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    mixin OpEquals;
    /** */ NamedArgument[] items;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
}

///
final class ArgumentList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    mixin OpEquals;
    /** */ ExpressionNode[] items;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
}

///
final class Arguments : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(namedArgumentList));
    }
    mixin OpEquals;
    /** */ NamedArgumentList namedArgumentList;
}

///
final class ArrayInitializer : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(arrayMemberInitializations));
    }
    mixin OpEquals;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
    /** */ ArrayMemberInitialization[] arrayMemberInitializations;
}

///
final class ArrayLiteral : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(argumentList));
    }
    mixin OpEquals;
    /** */ ArgumentList argumentList;
}

///
final class ArrayMemberInitialization : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assignExpression, nonVoidInitializer));
    }
    mixin OpEquals;
    /** */ ExpressionNode assignExpression;
    /** */ NonVoidInitializer nonVoidInitializer;
}

///
final class AsmAddExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin OpEquals;
    /** */ IdType operator;
    mixin BinaryExpressionBody;
}

///
final class AsmAndExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin OpEquals;
    mixin BinaryExpressionBody;
}

///
final class AsmBrExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(asmBrExp, asmExp, asmUnaExp));
    }
    mixin OpEquals;
    size_t line;
    size_t column;
    /** */ AsmBrExp asmBrExp;
    /** */ ExpressionNode asmExp;
    /** */ AsmUnaExp asmUnaExp;
}

///
final class AsmEqualExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
    /** */ IdType operator;
}

///
final class AsmExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, middle, right));
    }
    mixin OpEquals;
    /** */ ExpressionNode left;
    /** */ ExpressionNode middle;
    /** */ ExpressionNode right;
}

///
final class AsmInstruction : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifierOrIntegerOrOpcode, asmInstruction, operands));
    }
    mixin OpEquals;
    /** */ Token identifierOrIntegerOrOpcode;
    /** */ bool hasAlign;
    /** */ bool isLabel;
    /** */ AsmInstruction asmInstruction;
    /** */ Operands operands;
}

///
final class AsmLogAndExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class AsmLogOrExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class AsmMulExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ IdType operator;
    mixin BinaryExpressionBody;
    mixin OpEquals;

}

///
final class AsmOrExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class AsmPrimaryExp : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token, register, asmExp, identifierChain,
            segmentOverrideSuffix));
    }
    /** */ ExpressionNode asmExp;
    /** */ IdentifierChain identifierChain;
    /** */ Register register;
    /** */ ExpressionNode segmentOverrideSuffix;
    /** */ Token token;
    mixin OpEquals;
}

///
final class AsmRelExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    /** */ IdType operator;
    mixin OpEquals;
}

///
final class AsmShiftExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    /** */ IdType operator;
    mixin OpEquals;
}

///
final class AsmStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(functionAttributes, asmInstructions, gccAsmInstructions));
    }
    /** */ AsmInstruction[] asmInstructions;
    /** */ GccAsmInstruction[] gccAsmInstructions;
    /** */ FunctionAttribute[] functionAttributes;
    mixin OpEquals;
}

///
final class AsmTypePrefix : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ Token left;
    /** */ Token right;
    mixin OpEquals;
}

///
final class AsmUnaExp : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(prefix, asmTypePrefix, asmExp, asmPrimaryExp, asmUnaExp));
    }
    /** */ AsmTypePrefix asmTypePrefix;
    /** */ ExpressionNode asmExp;
    /** */ Token prefix;
    /** */ AsmPrimaryExp asmPrimaryExp;
    /** */ AsmUnaExp asmUnaExp;
    mixin OpEquals;
}

///
final class AsmXorExp : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class AssertArguments : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assertion, messageParts));
    }

    /** */ ExpressionNode assertion;
    /** */ ExpressionNode[] messageParts;
    mixin OpEquals;

    deprecated("use firstMessage or process all messageParts instead")
    alias message = firstMessage;

    /// Returns `messageParts[0]` or `null` if no messageParts.
    inout(ExpressionNode) firstMessage() inout nothrow pure @nogc @safe
    {
        return messageParts.length ? messageParts[0] : null;
    }
}

///
final class AssertExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assertArguments));
    }
    /** */ size_t line;
    /** */ size_t column;
    /** */ AssertArguments assertArguments;
    mixin OpEquals;
}

///
final class AssignExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(ternaryExpression, expression));
    }
    /** */ ExpressionNode ternaryExpression;
    /** */ ExpressionNode expression;
    /** */ IdType operator;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;
}

///
final class AssocArrayLiteral : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(keyValuePairs));
    }
    /** */ KeyValuePairs keyValuePairs;
    mixin OpEquals;
}

/// User-defined `@attribute` attributes. Also includes `@disable`, `@nogc`,
/// `@live`, etc. by simply having them be regular identifiers.
final class AtAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateInstance, argumentList, templateSingleArgument));
    }

    /// Set for all of `@identifier(argumentList)`,
    /// `@templateInstance!T(argumentList)` and `@(argumentListInParens)`.
    ArgumentList argumentList;
    /// When there is at least one template argument (`@id!T` or `@id!(T, U)`,
    /// etc.), this is set instead of $(LREF identifier).
    /// For regular `@identifier` or `@fn(args)` UDAs without template arguments,
    /// `identifier` is set instead.
    TemplateInstance templateInstance;
    /// True for `@(argumentList)` code, as well as
    /// `@templateInstance!T(argumentList)` and `@identifier(argumentList)`.
    bool useParen;
    /// For `@identifier`, the identifier part.
    /// Not set for `@identifer!templateArgs`, see $(LREF templateInstance) for that.
    /// This is however set for `@identifier(regularArguments)`.
    Token identifier;
    /// For `@int` or `@5`, the part after the `@`. May only be a single token,
    /// may not be identifier (see $(LREF identifier) for that).
    /// Introduced with DMD 2.104.0
    TemplateSingleArgument templateSingleArgument;

    /** */ size_t startLocation;
    /** */ size_t endLocation;
    mixin OpEquals;

    /// Returns either $(LREF identifier) or $(LREF templateSingleArgument),
    /// whichever is set, otherwise `Token.init`.
    ///
    /// This is the single token after the `@` for `@identifier`, `@5`,
    /// `@"string literal"`, etc.
    ///
    /// Not set if parens are used, e.g. not set for `@("string in parens")`.
    Token token() const nothrow pure @nogc @safe scope
    {
        return identifier != tok!""
            ? identifier
            : templateSingleArgument
                ? templateSingleArgument.token
                : Token.init;
    }
}

///
final class Attribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(pragmaExpression, deprecated_, atAttribute,
            alignAttribute, identifierChain, linkageAttribute));
    }
    /** */ PragmaExpression pragmaExpression;
    /** */ Deprecated deprecated_;
    /** */ AtAttribute atAttribute;
    /** */ AlignAttribute alignAttribute;
    /** */ LinkageAttribute linkageAttribute;
    /** */ Token attribute;
    /** */ IdentifierChain identifierChain;
    mixin OpEquals;
}

///
final class AttributeDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(attribute));
    }
    /** */ Attribute attribute;
    /** */ size_t line;
    mixin OpEquals;
}

///
final class AutoDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        foreach (sc; storageClasses)
            visitor.visit(sc);
        foreach (part; parts)
            visitor.visit(part);
    }
    /** */ AutoDeclarationPart[] parts;
    /** */ StorageClass[] storageClasses;
    /** */ string comment;
    mixin OpEquals;
}

final class AutoDeclarationPart : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        if (templateParameters !is null)
            visitor.visit(templateParameters);
        visitor.visit(initializer);
    }

    /** */ Token identifier;
    /** */ Initializer initializer;
    /** */ TemplateParameters templateParameters;
}

///
final class BlockStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declarationsAndStatements));
    }

    /**
     * Byte position of the opening brace
     */
    size_t startLocation;

    /**
     * Byte position of the closing brace
     */
    size_t endLocation;

    /** */ DeclarationsAndStatements declarationsAndStatements;
    mixin OpEquals;
}

///
final class BreakStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(label));
    }
    /** */ Token label;
    mixin OpEquals;
}

///
final class BaseClass : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type2));
    }
    /** */ Type2 type2;
    mixin OpEquals;
}

///
final class BaseClassList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    /** */ BaseClass[] items;
    mixin OpEquals;
}

///
final class CaseRangeStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(low, high, declarationsAndStatements));
    }
    /** */ ExpressionNode low;
    /** */ ExpressionNode high;
    /** */ DeclarationsAndStatements declarationsAndStatements;
    /** */ size_t colonLocation;
    mixin OpEquals;
}

///
final class CaseStatement: BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(argumentList, declarationsAndStatements));
    }
    /** */ ArgumentList argumentList;
    /** */ DeclarationsAndStatements declarationsAndStatements;
    /** */ size_t colonLocation;
    mixin OpEquals;
}

///
final class CastExpression: BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, castQualifier, unaryExpression));
    }
    /** */ Type type;
    /** */ CastQualifier castQualifier;
    /** */ UnaryExpression unaryExpression;
    mixin OpEquals;
}

///
final class CastQualifier: BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(first, second));
    }
    /** */ Token first;
    /** */ Token second;
    mixin OpEquals;
}

///
final class Catches: BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(catches, lastCatch));
    }
    /** */ Catch[] catches;
    /** */ LastCatch lastCatch;
    mixin OpEquals;
}

///
final class Catch: BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, identifier, declarationOrStatement));
    }
    /** */ Type type;
    /** */ Token identifier;
    /** */ DeclarationOrStatement declarationOrStatement;
    mixin OpEquals;
}

///
final class ClassDeclaration: BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateParameters, constraint, baseClassList,
            structBody));
    }

    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ Constraint constraint;
    /** */ BaseClassList baseClassList;
    /** */ StructBody structBody;
    /** */ string comment;
    mixin OpEquals;
}

///
final class CmpExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(shiftExpression, equalExpression,
            identityExpression, relExpression, inExpression));
    }
    /** */ ExpressionNode shiftExpression;
    /** */ ExpressionNode equalExpression;
    /** */ ExpressionNode identityExpression;
    /** */ ExpressionNode relExpression;
    /** */ ExpressionNode inExpression;
    mixin OpEquals;
}

///
final class CompileCondition : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(versionCondition, debugCondition, staticIfCondition));
    }
    /** */ VersionCondition versionCondition;
    /** */ DebugCondition debugCondition;
    /** */ StaticIfCondition staticIfCondition;
    mixin OpEquals;
}

///
final class ConditionalDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(compileCondition, trueDeclarations, falseDeclarations));
    }
    /** */ CompileCondition compileCondition;
    /** */ Declaration[] trueDeclarations;
    /** */ Declaration[] falseDeclarations;
    /** */ bool hasElse;
    /** */ DeclarationListStyle trueStyle;
    /** */ DeclarationListStyle falseStyle;
    mixin OpEquals;
}

///
final class ConditionalStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(compileCondition, trueStatement, falseStatement));
    }
    /** */ CompileCondition compileCondition;
    /** */ DeclarationOrStatement trueStatement;
    /** */ DeclarationOrStatement falseStatement;
    mixin OpEquals;
}

///
final class Constraint : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression));
    }
    /** */ Expression expression;
    /** */ size_t location;
    mixin OpEquals;
}

///
final class Constructor : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(parameters, templateParameters, constraint,
            memberFunctionAttributes, functionBody));
    }
    /** */ Parameters parameters;
    /** */ FunctionBody functionBody;
    /** */ Constraint constraint;
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ TemplateParameters templateParameters;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    /** */ string comment;
    mixin OpEquals;
}

///
final class ContinueStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(label));
    }
    /** */ Token label;
    mixin OpEquals;
}

///
final class DebugCondition : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifierOrInteger));
    }
    /** */ size_t debugIndex;
    /** */ Token identifierOrInteger;
    mixin OpEquals;
}

///
final class DebugSpecification : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifierOrInteger));
    }
    /** */ Token identifierOrInteger;
    mixin OpEquals;
}

///
final class Declaration : BaseNode
{

    override void accept(ASTVisitor visitor) const
    {

        foreach (attr; attributes)
            visitor.visit(attr);
        foreach (dec; declarations)
            visitor.visit(dec);
        foreach (Type; DeclarationTypes)
        {
            const(Type)* value = storage.peek!Type;
            if (value !is null)
            {
                static if (isArray!Type)
                    foreach (item; *(cast(Type*) value))
                        visitor.visit(item);
                else if (*value !is null)
                    visitor.visit(*(cast(Type*) value));
            }
        }
    }

    import std.typetuple : TypeTuple;
    import std.variant : Algebraic;

    alias DeclarationTypes = TypeTuple!(AliasDeclaration, AliasAssign, AliasThisDeclaration,
        AnonymousEnumDeclaration, AttributeDeclaration,
        ClassDeclaration, ConditionalDeclaration, Constructor, DebugSpecification,
        Destructor, EnumDeclaration, EponymousTemplateDeclaration,
        FunctionDeclaration, ImportDeclaration, InterfaceDeclaration, Invariant,
        MixinDeclaration, MixinTemplateDeclaration, Postblit, PragmaDeclaration,
        SharedStaticConstructor, SharedStaticDestructor, StaticAssertDeclaration,
        StaticConstructor, StaticDestructor, StructDeclaration,
        TemplateDeclaration, UnionDeclaration, Unittest, VariableDeclaration,
        VersionSpecification, StaticForeachDeclaration);

    private Algebraic!(DeclarationTypes) storage;

    private static string generateProperty(string type, string name)
    {
        return "const(" ~ type ~ ") " ~ name ~ "() const @property { auto p = storage.peek!" ~ type ~ "; return p is null? null : *p;}\n"
            ~ "const(" ~ type ~ ") " ~ name ~ "(" ~ type ~ " node) @property { storage = node; return node; }";
    }

    /** */ Attribute[] attributes;
    /** */ Declaration[] declarations;

    mixin(generateProperty("AliasDeclaration", "aliasDeclaration"));
    mixin(generateProperty("AliasAssign", "aliasAssign"));
    mixin(generateProperty("AliasThisDeclaration", "aliasThisDeclaration"));
    mixin(generateProperty("AnonymousEnumDeclaration", "anonymousEnumDeclaration"));
    mixin(generateProperty("AttributeDeclaration", "attributeDeclaration"));
    mixin(generateProperty("ClassDeclaration", "classDeclaration"));
    mixin(generateProperty("ConditionalDeclaration", "conditionalDeclaration"));
    mixin(generateProperty("Constructor", "constructor"));
    mixin(generateProperty("DebugSpecification", "debugSpecification"));
    mixin(generateProperty("Destructor", "destructor"));
    mixin(generateProperty("EnumDeclaration", "enumDeclaration"));
    mixin(generateProperty("EponymousTemplateDeclaration", "eponymousTemplateDeclaration"));
    mixin(generateProperty("FunctionDeclaration", "functionDeclaration"));
    mixin(generateProperty("ImportDeclaration", "importDeclaration"));
    mixin(generateProperty("InterfaceDeclaration", "interfaceDeclaration"));
    mixin(generateProperty("Invariant", "invariant_"));
    mixin(generateProperty("MixinDeclaration", "mixinDeclaration"));
    mixin(generateProperty("MixinTemplateDeclaration", "mixinTemplateDeclaration"));
    mixin(generateProperty("Postblit", "postblit"));
    mixin(generateProperty("PragmaDeclaration", "pragmaDeclaration"));
    mixin(generateProperty("SharedStaticConstructor", "sharedStaticConstructor"));
    mixin(generateProperty("SharedStaticDestructor", "sharedStaticDestructor"));
    mixin(generateProperty("StaticAssertDeclaration", "staticAssertDeclaration"));
    mixin(generateProperty("StaticConstructor", "staticConstructor"));
    mixin(generateProperty("StaticDestructor", "staticDestructor"));
    mixin(generateProperty("StructDeclaration", "structDeclaration"));
    mixin(generateProperty("TemplateDeclaration", "templateDeclaration"));
    mixin(generateProperty("UnionDeclaration", "unionDeclaration"));
    mixin(generateProperty("Unittest", "unittest_"));
    mixin(generateProperty("VariableDeclaration", "variableDeclaration"));
    mixin(generateProperty("VersionSpecification", "versionSpecification"));
    mixin(generateProperty("StaticForeachDeclaration", "staticForeachDeclaration"));

    override bool opEquals(Object other) const
    {
        auto otherDeclaration = cast(Declaration) other;
        if (otherDeclaration is null)
            return false;
        return attributes == otherDeclaration.attributes
            && declarations == otherDeclaration.declarations
            && storage == otherDeclaration.storage;
    }
}

///
final class DeclarationsAndStatements : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declarationsAndStatements));
    }

    /** */ DeclarationOrStatement[] declarationsAndStatements;
    mixin OpEquals;
}

///
final class DeclarationOrStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declaration, statement));
    }

    /** */ Declaration declaration;
    /** */ Statement statement;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
    mixin OpEquals;
}

///
final class Declarator : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateParameters, bitfieldWidth, initializer));
    }
    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ BitfieldWidth bitfieldWidth;
    /** */ Initializer initializer;
    /** */ TypeSuffix[] cstyle;
    /** */ string comment;
    mixin OpEquals;
}

///
final class BitfieldWidth : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression));
    }
    /** */ ExpressionNode expression;
    mixin OpEquals;
}

///
final class DeclaratorIdentifierList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifiers));
    }
    /** */ Token[] identifiers;
    mixin OpEquals;
}

///
final class DefaultStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declarationsAndStatements));
    }
    /** */ DeclarationsAndStatements declarationsAndStatements;
    /** */ size_t colonLocation;
    mixin OpEquals;
}

///
final class DeleteExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(unaryExpression));
    }
    /** */ UnaryExpression unaryExpression;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;
}

///
final class DeleteStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(deleteExpression));
    }
    /** */ DeleteExpression deleteExpression;
    mixin OpEquals;
}

///
final class Deprecated : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assignExpression));
    }
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}

///
final class Destructor : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(memberFunctionAttributes, functionBody));
    }
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ FunctionBody functionBody;
    /** */ size_t line;
    /** */ size_t column;
    /** */ size_t index;
    /** */ string comment;
    mixin OpEquals;
}

///
final class DoStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression, statementNoCaseNoDefault));
    }
    /** */ StatementNoCaseNoDefault statementNoCaseNoDefault;
    /** */ Expression expression;
    mixin OpEquals;
}

///
final class EnumBody : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(enumMembers));
    }
    /** */ EnumMember[] enumMembers;

    /**
     * Byte position of the opening brace
     */
    size_t startLocation;

    /**
     * Byte position of the closing brace
     */
    size_t endLocation;
    mixin OpEquals;
}

///
final class EnumDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, enumBody));
    }
    /** */ Token name;
    /** */ Type type;
    /** */ EnumBody enumBody;
    /** */ string comment;
    mixin OpEquals;
}

final class EnumMemberAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(deprecated_, atAttribute));
    }
    /** */ Deprecated deprecated_;
    /** */ AtAttribute atAttribute;
    mixin OpEquals;
}

///
final class EnumMember : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(enumMemberAttributes, name, type, assignExpression));
    }
    /** */ EnumMemberAttribute[] enumMemberAttributes;
    /** */ Token name;
    /** */ Type type;
    /** */ ExpressionNode assignExpression;
    /** */ string comment;
    mixin OpEquals;
}

///
final class EponymousTemplateDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(name, templateParameters, assignExpression));
    }
    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ ExpressionNode assignExpression;
    /** */ Type type;
    /** */ string comment;
    mixin OpEquals;
}

///
final class EqualExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ IdType operator;
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class Expression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    /** */ ExpressionNode[] items;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;
}

///
final class ExpressionStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression));
    }
    /** */ Expression expression;
    mixin OpEquals;
}

///
final class FinalSwitchStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(switchStatement));
    }
    /** */ SwitchStatement switchStatement;
    mixin OpEquals;
}

///
final class Finally : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declarationOrStatement));
    }
    /** */ DeclarationOrStatement declarationOrStatement;
    mixin OpEquals;
}

///
final class ForStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(initialization, test, increment,
            declarationOrStatement));
    }
    /** */ DeclarationOrStatement initialization;
    /** */ Expression test;
    /** */ Expression increment;
    /** */ DeclarationOrStatement declarationOrStatement;
    /** */ size_t startIndex;
    mixin OpEquals;
}


///
final class Foreach(bool declOnly) : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(foreachType, foreachTypeList, low, high));
        static if (declOnly)
            mixin (visitIfNotNull!(declarations));
        else
            mixin (visitIfNotNull!(declarationOrStatement));
    }
    /** */ IdType type;
    /** */ ForeachTypeList foreachTypeList;
    /** */ ForeachType foreachType;
    /** */ Expression low;
    /** */ Expression high;
    /** */ size_t startIndex;
    static if (declOnly)
    {
        /** */ Declaration[] declarations;
        /** */ DeclarationListStyle style;
    }
    else
    {
        /** */ DeclarationOrStatement declarationOrStatement;
    }
    mixin OpEquals;
}

///
alias StaticForeachDeclaration = Foreach!true;

///
alias ForeachStatement = Foreach!false;

///
final class StaticForeachStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(foreachStatement));
    }
    /** */ ForeachStatement foreachStatement;
    mixin OpEquals;
}

///
final class ForeachType : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, identifier));
    }
    /** */ bool isAlias;
    /** */ bool isEnum;
    /** */ bool isRef;
    /** */ bool isScope;
    /** */ IdType[] typeConstructors;
    /** */ Type type;
    /** */ Token identifier;
    mixin OpEquals;
}

///
final class ForeachTypeList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    /** */ ForeachType[] items;
    mixin OpEquals;
}

///
final class FunctionAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token, atAttribute));
    }
    /** */ Token token;
    /** */ AtAttribute atAttribute;
    mixin OpEquals;
}

///
final class FunctionBody : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(specifiedFunctionBody, missingFunctionBody, shortenedFunctionBody));
    }

    /** */ size_t endLocation;
    /** */ SpecifiedFunctionBody specifiedFunctionBody;
    /** */ MissingFunctionBody missingFunctionBody;
    /** */ ShortenedFunctionBody shortenedFunctionBody;
    mixin OpEquals;
}

///
final class FunctionCallExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, unaryExpression, templateArguments, arguments));
    }
    /** */ Type type;
    /** */ UnaryExpression unaryExpression;
    /** */ TemplateArguments templateArguments;
    /** */ Arguments arguments;
    mixin OpEquals;
}

///
final class FunctionContract : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(inOutContractExpression, inOutStatement));
    }
    /** */ InOutContractExpression inOutContractExpression;
    /** */ InOutStatement inOutStatement;
    mixin OpEquals;
}

///
final class FunctionDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(attributes, storageClasses, returnType, parameters,
            templateParameters, constraint, memberFunctionAttributes,
            functionBody));
    }
    /** */ bool hasAuto;
    /** */ bool hasRef;
    /** */ Type returnType;
    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ Parameters parameters;
    /** */ Constraint constraint;
    /** */ FunctionBody functionBody;
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ string comment;
    /** */ Attribute[] attributes;
    /** */ StorageClass[] storageClasses;
    mixin OpEquals;
}

///
final class FunctionLiteralExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(returnType, parameters, functionAttributes,
                memberFunctionAttributes, specifiedFunctionBody, assignExpression));
    }
    /** */ ExpressionNode assignExpression;
    /** */ FunctionAttribute[] functionAttributes;
    /** */ SpecifiedFunctionBody specifiedFunctionBody;
    /** */ IdType functionOrDelegate;
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ Parameters parameters;
    /** */ Token identifier;
    /** */ Type returnType;
    /** */ ReturnRefType returnRefType;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;

    deprecated("Use returnRefType") bool isReturnRef() const
    {
        return returnRefType == ReturnRefType.ref_
            || returnRefType == ReturnRefType.autoRef;
    }
}

///
enum ReturnRefType : ubyte
{
    noRef = 0,
    ref_ = 1,
    autoRef = 2
}

///
final class GccAsmInstruction : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assemblerTemplate, inputOperands, outputOperands, registers, gotos));
    }

    /** */ Expression assemblerTemplate;
    /** */ GccAsmOperandList inputOperands;
    /** */ GccAsmOperandList outputOperands;
    /** */ StringLiteralList registers;
    /** */ DeclaratorIdentifierList gotos;
    mixin OpEquals;
}

///
final class GccAsmOperand : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression, constraint, symbolicName));
    }

    /** */ Token symbolicName;
    /** */ Token constraint;
    /** */ ExpressionNode expression;
    mixin OpEquals;
}

///
final class GccAsmOperandList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }

    /** */ GccAsmOperand[] items;
    mixin OpEquals;
}

///
final class GotoStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(label, expression));
    }
    /** */ Expression expression;
    /** */ Token label;
    mixin OpEquals;
}

///
final class IdentifierChain : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifiers));
    }
    /** */ Token[] identifiers;
    mixin OpEquals;
}

///
final class TypeIdentifierPart : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifierOrTemplateInstance, typeIdentifierPart,
            indexer));
    }
    /** */ bool dot;
    /** */ IdentifierOrTemplateInstance identifierOrTemplateInstance;
    /** */ TypeIdentifierPart typeIdentifierPart ;
    /** */ ExpressionNode indexer;
    mixin OpEquals;
}

///
final class IdentifierOrTemplateChain : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifiersOrTemplateInstances));
    }

    /** */ IdentifierOrTemplateInstance[] identifiersOrTemplateInstances;
    mixin OpEquals;
}

///
final class IdentifierOrTemplateInstance : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, templateInstance));
    }

    /** */ Token identifier;
    /** */ TemplateInstance templateInstance;
    mixin OpEquals;
}

///
final class IdentityExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ bool negated;
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class IfStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(condition, thenStatement, elseStatement));
    }
    /** */ IfCondition condition;
    /** */ DeclarationOrStatement thenStatement;
    /** */ DeclarationOrStatement elseStatement;
    /** */ size_t startIndex;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;

    deprecated("use condition.typeCtors") inout(IdType[]) typeCtors() inout @property
    {
        if (!condition)
            return null;
        return condition.typeCtors;
    }

    deprecated("use condition.type") inout(Type) type() inout @property
    {
        if (!condition)
            return null;
        return condition.type;
    }

    deprecated("use condition.identifier") inout(Token) identifier() inout @property
    {
        if (!condition)
            return Token.init;
        return condition.identifier;
    }

    deprecated("use condition.expression") inout(Expression) expression() inout @property
    {
        if (!condition)
            return null;
        return condition.expression;
    }
}

/**
In an if (or while) condition this represents:
```
if (auto x = readln)
    ^^^^^^^^^^^^^^^

if (a == b || c == d)
    ^^^^^^^^^^^^^^^^
```
*/
final class IfCondition : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, identifier, expression));
    }
    /// In an assignment-condition, these are the optional type constructors
    IdType[] typeCtors;
    /// In an assignment-condition, this is the optional explicit type
    Type type;
    /// In an assignment-condition, in `if (auto x = ...)` this is the `x`
    Token identifier;
    /**
    In an assignment-condition, this is true if `scope` is used to construct
    the variable.
    */
    bool scope_;
    /**
    In an assignment-condition, this is the part after the equals sign.
    Otherwise this is any other expression that is evaluated to be a boolean.
    (e.g. UnaryExpression, AndAndExpression, CmpExpression, etc.)
    */
    Expression expression;
    mixin OpEquals;
}

///
final class ImportBind : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ Token left;
    /** */ Token right;
    mixin OpEquals;
}

///
final class ImportBindings : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(singleImport, importBinds));
    }
    /** */ SingleImport singleImport;
    /** */ ImportBind[] importBinds;
    mixin OpEquals;
}

///
final class ImportDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(singleImports, importBindings));
    }
    /** */ SingleImport[] singleImports;
    /** */ ImportBindings importBindings;
    /** */ size_t startIndex;
    /** */ size_t endIndex;
    mixin OpEquals;
}

///
final class ImportExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assignExpression));
    }
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}

///
final class Index : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(low, high));
    }
    /** */ ExpressionNode low;
    /** */ ExpressionNode high;
    mixin OpEquals;
}

///
final class IndexExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(unaryExpression, indexes));
    }
    /** */ UnaryExpression unaryExpression;
    /** */ Index[] indexes;
    mixin OpEquals;
}

///
final class InContractExpression : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assertArguments));
    }
    /** */ size_t inTokenLocation;
    /** */ AssertArguments assertArguments;
    mixin OpEquals;
}

///
final class InExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    bool negated;
    mixin OpEquals;
}

///
final class InOutContractExpression : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(inContractExpression, outContractExpression));
    }
    /** */ InContractExpression inContractExpression;
    /** */ OutContractExpression outContractExpression;
    mixin OpEquals;
}

///
final class InOutStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(inStatement, outStatement));
    }
    /** */ InStatement inStatement;
    /** */ OutStatement outStatement;
    mixin OpEquals;
}

///
final class InStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(blockStatement));
    }
    /** */ size_t inTokenLocation;
    /** */ BlockStatement blockStatement;
    mixin OpEquals;
}

///
final class Initialize : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(statementNoCaseNoDefault));
    }
    /** */ StatementNoCaseNoDefault statementNoCaseNoDefault;
    mixin OpEquals;
}

///
final class Initializer : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(nonVoidInitializer));
    }
    /** */ NonVoidInitializer nonVoidInitializer;
    mixin OpEquals;
}

///
final class InterfaceDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateParameters, constraint, baseClassList,
            structBody));
    }
    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ Constraint constraint;
    /** */ BaseClassList baseClassList;
    /** */ StructBody structBody;
    /** */ string comment;
    mixin OpEquals;
}

///
final class InterpolatedString : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(parts));
    }

    /** */ InterpolatedStringPart[] parts;

    inout(Token) startQuote() inout pure nothrow @nogc @safe scope
    {
        return tokens.length ? tokens[0] : Token.init;
    }

    inout(Token) endQuote() inout pure nothrow @nogc @safe scope
    {
        return tokens.length && tokens[$ - 1].type == tok!"istringLiteralEnd"
            ? tokens[$ - 1]
            : Token.init;
    }

    /// '\0'/'c'/'w'/'d' for `i""`, `i""c`, `i""w` and `i""d` respectively.
    char postfixType() inout pure nothrow @nogc @safe scope
    {
        auto end = endQuote.text;
        auto endChar = end.length ? end[$ - 1] : ' ';
        switch (endChar)
        {
        case 'c':
        case 'w':
        case 'd':
            return endChar;
        default:
            return '\0';
        }
    }

    mixin OpEquals!("startQuote.text", "postfixType");
}

/// AST nodes within an interpolated string
abstract class InterpolatedStringPart : BaseNode
{
}

/// Just plain text inside the interpolated string
final class InterpolatedStringText : InterpolatedStringPart
{
    override void accept(ASTVisitor visitor) const
    {
    }

    /// The token containing the plain text part in its `.text` property.
    inout(Token) text() inout pure nothrow @nogc @safe scope
    {
        return tokens.length ? tokens[0] : Token.init;
    }

    mixin OpEquals!("text.text");
}

/// A $(...) interpolation sequence
final class InterpolatedStringExpression : InterpolatedStringPart
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression));
    }

    /** */ Expression expression;

    /// The dollar token.
    inout(Token) dollar() inout pure nothrow @nogc @safe scope
    {
        return tokens.length ? tokens[0] : Token.init;
    }

    mixin OpEquals;
}

///
final class Invariant : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(blockStatement, assertArguments));
    }
    /** */ BlockStatement blockStatement;
    /** */ AssertArguments assertArguments;
    /** */ bool useParen;
    /** */ string comment;
    size_t line;
    size_t index;
    mixin OpEquals;
}

///
final class IsExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, identifier, typeSpecialization,
            templateParameterList));
    }
    /** */ Type type;
    /** */ Token identifier;
    /** */ TypeSpecialization typeSpecialization;
    /** */ TemplateParameterList templateParameterList;
    /** */ IdType equalsOrColon;
    mixin OpEquals;
}

///
final class KeyValuePair : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(key, value));
    }
    /** */ ExpressionNode key;
    /** */ ExpressionNode value;
    mixin OpEquals;
}

///
final class KeyValuePairs : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(keyValuePairs));
    }
    /** */ KeyValuePair[] keyValuePairs;
    mixin OpEquals;
}

///
final class LabeledStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, declarationOrStatement));
    }
    /** */ Token identifier;
    /** */ DeclarationOrStatement declarationOrStatement;
    mixin OpEquals;
}

///
final class LastCatch : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(statementNoCaseNoDefault));
    }
    /** */ StatementNoCaseNoDefault statementNoCaseNoDefault;
    size_t line;
    size_t column;
    mixin OpEquals;
}

///
final class LinkageAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, typeIdentifierPart, cppNamespaces));
    }
    /** */ Token identifier;
    /** */ bool hasPlusPlus;
    /** */ TypeIdentifierPart typeIdentifierPart;
    /** */ IdType classOrStruct;
    /** */ NamespaceList cppNamespaces;
    mixin OpEquals;
}

///
final class MemberFunctionAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(atAttribute));
    }
    /** */ IdType tokenType;
    /** */ AtAttribute atAttribute;
    mixin OpEquals;
}

///
final class MissingFunctionBody : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(functionContracts));
    }
    /** */ FunctionContract[] functionContracts;
    mixin OpEquals;
}

///
final class MixinDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(mixinExpression, templateMixinExpression));
    }
    /** */ MixinExpression mixinExpression;
    /** */ TemplateMixinExpression templateMixinExpression;
    mixin OpEquals;
}

///
final class MixinExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(argumentList));
    }
    /** */ ArgumentList argumentList;
    mixin OpEquals;
}

///
final class MixinTemplateDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateDeclaration));
    }
    /** */ TemplateDeclaration templateDeclaration;
    mixin OpEquals;
}

///
final class MixinTemplateName : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(symbol, typeofExpression, identifierOrTemplateChain));
    }
    /** */ Symbol symbol;
    /** */ IdentifierOrTemplateChain identifierOrTemplateChain;
    /** */ TypeofExpression typeofExpression;
    mixin OpEquals;
}

///
final class Module : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(scriptLine, moduleDeclaration, declarations));
    }
    /** */ Token scriptLine;
    /** */ ModuleDeclaration moduleDeclaration;
    /** */ Declaration[] declarations;
    mixin OpEquals;
}

///
final class ModuleDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(atAttributes, deprecated_, moduleName));
    }
    /** */ AtAttribute[] atAttributes;
    /** */ Deprecated deprecated_;
    /** */ IdentifierChain moduleName;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
    /** */ string comment;
    mixin OpEquals;
}


///
final class MulExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ IdType operator;
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class NamespaceList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    mixin OpEquals;
    /** */ TernaryExpression[] items;
}

///
final class NewAnonClassExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(allocatorArguments, constructorArguments,
            baseClassList, structBody));
    }
    /** */ Arguments allocatorArguments;
    /** */ Arguments constructorArguments;
    /** */ BaseClassList baseClassList;
    /** */ StructBody structBody;
    mixin OpEquals;
}

///
final class NewExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(newAnonClassExpression, type, arguments,
            assignExpression));
    }
    /** */ Type type;
    /** */ NewAnonClassExpression newAnonClassExpression;
    /** */ Arguments arguments;
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}


///
final class StatementNoCaseNoDefault : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(labeledStatement, blockStatement, ifStatement,
            whileStatement, doStatement, forStatement, foreachStatement,
            switchStatement, finalSwitchStatement, continueStatement,
            breakStatement, returnStatement, gotoStatement, withStatement,
            synchronizedStatement, tryStatement,
            scopeGuardStatement, asmStatement, pragmaStatement,
            conditionalStatement, staticAssertStatement, versionSpecification,
            debugSpecification, expressionStatement, staticForeachStatement));
    }
    /** */ LabeledStatement labeledStatement;
    /** */ BlockStatement blockStatement;
    /** */ IfStatement ifStatement;
    /** */ WhileStatement whileStatement;
    /** */ DoStatement doStatement;
    /** */ ForStatement forStatement;
    /** */ ForeachStatement foreachStatement;
    /** */ StaticForeachStatement staticForeachStatement;
    /** */ SwitchStatement switchStatement;
    /** */ FinalSwitchStatement finalSwitchStatement;
    /** */ ContinueStatement continueStatement;
    /** */ BreakStatement breakStatement;
    /** */ ReturnStatement returnStatement;
    /** */ GotoStatement gotoStatement;
    /** */ WithStatement withStatement;
    /** */ SynchronizedStatement synchronizedStatement;
    /** */ TryStatement tryStatement;
    /** */ ScopeGuardStatement scopeGuardStatement;
    /** */ AsmStatement asmStatement;
    /** */ PragmaStatement pragmaStatement;
    /** */ ConditionalStatement conditionalStatement;
    /** */ StaticAssertStatement staticAssertStatement;
    /** */ VersionSpecification versionSpecification;
    /** */ DebugSpecification debugSpecification;
    /** */ ExpressionStatement expressionStatement;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
    mixin OpEquals;
}

///
final class NonVoidInitializer : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assignExpression, arrayInitializer,
            structInitializer));
    }
    /** */ ExpressionNode assignExpression;
    /** */ ArrayInitializer arrayInitializer;
    /** */ StructInitializer structInitializer;

    mixin OpEquals;
}

///
final class Operands : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(operands));
    }
    /** */ ExpressionNode[] operands;
    mixin OpEquals;
}

///
final class OrExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class OrOrExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class OutContractExpression : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(parameter, assertArguments));
    }
    /** */ size_t outTokenLocation;
    /** */ Token parameter;
    /** */ AssertArguments assertArguments;
    mixin OpEquals;
}

///
final class OutStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(parameter, blockStatement));
    }
    /** */ size_t outTokenLocation;
    /** */ Token parameter;
    /** */ BlockStatement blockStatement;
    mixin OpEquals;
}

final class ParameterAttribute : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(atAttribute));
    }
    /** */ IdType idType;
    /** */ AtAttribute atAttribute;
}

///
final class Parameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, name, default_));
    }

    /** */ ParameterAttribute[] parameterAttributes;
    /** */ Type type;
    /** */ Token name;
    /** */ bool vararg;
    /** */ ExpressionNode default_;
    /** */ TypeSuffix[] cstyle;

    mixin OpEquals;
}

///
final class Parameters : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(parameters));
    }

    /** */ Parameter[] parameters;
    /** */ bool hasVarargs;
    /** */ ParameterAttribute[] varargsAttributes;
    mixin OpEquals;
}

///
final class Postblit : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(functionBody));
    }
    /** */ FunctionBody functionBody;
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;
}

///
final class PowExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class PragmaDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(pragmaExpression));
    }
    /** */ PragmaExpression pragmaExpression;
    mixin OpEquals;
}

///
final class PragmaExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, argumentList));
    }
    /** */ Token identifier;
    /** */ ArgumentList argumentList;
    mixin OpEquals;
}

///
final class PragmaStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(pragmaExpression, statement, blockStatement));
    }
    /** */ PragmaExpression pragmaExpression;
    /** */ Statement statement;
    /** */ BlockStatement blockStatement;
    mixin OpEquals;
}

///
final class PrimaryExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin(visitIfNotNull!(basicType, typeConstructor, type, primary,
                typeofExpression, typeidExpression, arrayLiteral, assocArrayLiteral,
                expression, dot, identifierOrTemplateInstance, isExpression,
                functionLiteralExpression,traitsExpression, mixinExpression,
                importExpression, vector, arguments, interpolatedString));
    }
    /** */ Token dot;
    /** */ Token primary;
    /** */ IdentifierOrTemplateInstance identifierOrTemplateInstance;
    /** */ Token basicType;
    /** */ TypeofExpression typeofExpression;
    /** */ TypeidExpression typeidExpression;
    /** */ ArrayLiteral arrayLiteral;
    /** */ AssocArrayLiteral assocArrayLiteral;
    /** */ Expression expression;
    /** */ IsExpression isExpression;
    /** */ FunctionLiteralExpression functionLiteralExpression;
    /** */ TraitsExpression traitsExpression;
    /** */ MixinExpression mixinExpression;
    /** */ ImportExpression importExpression;
    /** */ Vector vector;
    /** */ Type type;
    /** */ Token typeConstructor;
    /** */ Arguments arguments;
    /** */ InterpolatedString interpolatedString;
    mixin OpEquals;

    IdType builtinType() inout @property @safe nothrow @nogc pure
    {
        if (type)
            if (auto t2 = type.type2)
                return t2.builtinType ? t2.builtinType : IdType.init;
        return IdType.init;
    }
}

///
final class Register : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, intLiteral));
    }
    /** */ Token identifier;
    /** */ Token intLiteral;
    /** */ bool hasIntegerLiteral;
    mixin OpEquals;
}

///
final class RelExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ IdType operator;
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class ReturnStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression));
    }
    /** */ Expression expression;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
    mixin OpEquals;
}

///
final class ScopeGuardStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, declarationOrStatement));
    }
    /** */ Token identifier;
    /** */ DeclarationOrStatement declarationOrStatement;
    mixin OpEquals;

    deprecated("Scope guards may also contain declarations")
    inout(StatementNoCaseNoDefault) statementNoCaseNoDefault() inout @safe pure nothrow @nogc
    {
        if (!declarationOrStatement || !declarationOrStatement.statement)
            return null;

        return declarationOrStatement.statement.statementNoCaseNoDefault;
    }
}

///
final class SharedStaticConstructor : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(memberFunctionAttributes, functionBody));
    }
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ FunctionBody functionBody;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    /** */ string comment;
    mixin OpEquals;
}

///
final class SharedStaticDestructor : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(memberFunctionAttributes, functionBody));
    }
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ FunctionBody functionBody;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    /** */ string comment;
    mixin OpEquals;
}

///
final class ShiftExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    /** */ IdType operator;
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

///
final class SingleImport : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(rename, identifierChain));
    }
    /** */ Token rename;
    /** */ IdentifierChain identifierChain;
    mixin OpEquals;
}

///
final class SpecifiedFunctionBody : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(functionContracts, blockStatement));
    }
    /** */ FunctionContract[] functionContracts;
    /** */ BlockStatement blockStatement;
    /** */ bool hasDo;
    mixin OpEquals;
}

///
final class ShortenedFunctionBody : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin(visitIfNotNull!(functionContracts, expression));
    }

    /** */ FunctionContract[] functionContracts;
    /** */ Expression expression;
    mixin OpEquals;
}

///
final class Statement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(statementNoCaseNoDefault, caseStatement,
            caseRangeStatement, defaultStatement));
    }
    /** */ StatementNoCaseNoDefault statementNoCaseNoDefault;
    /** */ CaseStatement caseStatement;
    /** */ CaseRangeStatement caseRangeStatement;
    /** */ DefaultStatement defaultStatement;
    mixin OpEquals;
}

///
final class StaticAssertDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(staticAssertStatement));
    }
    /** */ StaticAssertStatement staticAssertStatement;
    mixin OpEquals;
}

///
final class StaticAssertStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assertExpression));
    }
    /** */ AssertExpression assertExpression;
    mixin OpEquals;
}

///
final class StaticConstructor : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(memberFunctionAttributes, functionBody));
    }
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ FunctionBody functionBody;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    /** */ string comment;
    mixin OpEquals;
}

///
final class StaticDestructor : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(memberFunctionAttributes, functionBody));
    }
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    /** */ FunctionBody functionBody;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    /** */ string comment;
    mixin OpEquals;
}

///
final class StaticIfCondition : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(assignExpression));
    }
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}

///
final class StorageClass : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token, alignAttribute, linkageAttribute,
            atAttribute, deprecated_));
    }
    /** */ AlignAttribute alignAttribute;
    /** */ LinkageAttribute linkageAttribute;
    /** */ AtAttribute atAttribute;
    /** */ Deprecated deprecated_;
    /** */ Token token;
    mixin OpEquals;
}

///
final class StringLiteralList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }

    /** */ Token[] items;
    mixin OpEquals;
}

///
final class StructBody : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declarations));
    }

    /**
     * Byte position of the opening brace
     */
    size_t startLocation;

    /**
     * Byte position of the closing brace
     */
    size_t endLocation;
    /** */ Declaration[] declarations;
    mixin OpEquals;
}

///
final class StructDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateParameters, constraint, structBody));
    }
    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ Constraint constraint;
    /** */ StructBody structBody;
    /** */ string comment;
    mixin OpEquals;
}

///
final class StructInitializer : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(structMemberInitializers));
    }
    /** */ StructMemberInitializers structMemberInitializers;
    /** */ size_t startLocation;
    /** */ size_t endLocation;
    mixin OpEquals;
}

///
final class StructMemberInitializer : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, nonVoidInitializer));
    }
    /** */ Token identifier;
    /** */ NonVoidInitializer nonVoidInitializer;
    mixin OpEquals;
}

///
final class StructMemberInitializers : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(structMemberInitializers));
    }
    /** */ StructMemberInitializer[] structMemberInitializers;
    mixin OpEquals;
}

///
final class SwitchStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(condition, statement));
    }
    /** */ IfCondition condition;
    /** */ Statement statement;
    mixin OpEquals;

    deprecated("use condition.expression") inout(Expression) expression() inout @property @safe nothrow @nogc pure
    {
        if (!condition)
            return null;
        return condition.expression;
    }
}

///
final class Symbol : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifierOrTemplateChain));
    }

    /** */ IdentifierOrTemplateChain identifierOrTemplateChain;
    /** */ bool dot;
    mixin OpEquals;
}

///
final class SynchronizedStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression, statementNoCaseNoDefault));
    }
    /** */ Expression expression;
    /** */ StatementNoCaseNoDefault statementNoCaseNoDefault;
    mixin OpEquals;
}

///
final class TemplateAliasParameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, identifier, colonType, colonExpression,
            assignType, assignExpression));
    }
    /** */ Type type;
    /** */ Token identifier;
    /** */ Type colonType;
    /** */ ExpressionNode colonExpression;
    /** */ Type assignType;
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}

///
final class NamedTemplateArgument : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(name, type, assignExpression));
    }
    /** */ Token name;
    /** */ Type type;
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}

///
final class NamedTemplateArgumentList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    /** */ NamedTemplateArgument[] items;
    mixin OpEquals;
}

///
final class TemplateArgument : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, assignExpression));
    }
    /** */ Type type;
    /** */ ExpressionNode assignExpression;
    mixin OpEquals;
}

///
final class TemplateArgumentList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    /** */ TemplateArgument[] items;
    mixin OpEquals;
}

///
final class TemplateArguments : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(namedTemplateArgumentList, templateSingleArgument));
    }
    /** */ NamedTemplateArgumentList namedTemplateArgumentList;
    /** */ TemplateSingleArgument templateSingleArgument;
    mixin OpEquals;
}

///
final class TemplateDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(name, templateParameters, constraint,
            declarations));
    }
    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ Constraint constraint;
    /** */ Declaration[] declarations;
    /** */ string comment;
    /**
     * Byte position of the opening brace
     */
    size_t startLocation;

    /**
     * Byte position of the closing brace
     */
    size_t endLocation;
    mixin OpEquals;
}

///
final class TemplateInstance : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, templateArguments));
    }
    /** */ Token identifier;
    /** */ TemplateArguments templateArguments;
    mixin OpEquals;
}

///
final class TemplateMixinExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, templateArguments, mixinTemplateName));
    }
    /** */ Token identifier;
    /** */ TemplateArguments templateArguments;
    /** */ MixinTemplateName mixinTemplateName;
    mixin OpEquals;
}

///
final class TemplateParameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateTypeParameter, templateValueParameter,
            templateAliasParameter, templateTupleParameter,
            templateThisParameter));
    }
    /** */ TemplateTypeParameter templateTypeParameter;
    /** */ TemplateValueParameter templateValueParameter;
    /** */ TemplateAliasParameter templateAliasParameter;
    /** */ TemplateTupleParameter templateTupleParameter;
    /** */ TemplateThisParameter templateThisParameter;
    mixin OpEquals;
}

///
final class TemplateParameterList : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(items));
    }
    /** */ TemplateParameter[] items;
    mixin OpEquals;
}

///
final class TemplateParameters : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateParameterList));
    }
    /** */ TemplateParameterList templateParameterList;
    mixin OpEquals;
}

///
final class TemplateSingleArgument : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token, istring));
    }
    /** */ Token token;
    /** */ InterpolatedString istring;
    mixin OpEquals;
}

///
final class TemplateThisParameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(templateTypeParameter));
    }
    /** */ TemplateTypeParameter templateTypeParameter;
    mixin OpEquals;
}

///
final class TemplateTupleParameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier));
    }
    /** */ Token identifier;
    mixin OpEquals;
}

///
final class TemplateTypeParameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, colonType, assignType));
    }
    /** */ Token identifier;
    /** */ Type colonType;
    /** */ Type assignType;
    mixin OpEquals;
}

///
final class TemplateValueParameter : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, identifier, assignExpression,
            templateValueParameterDefault));
    }
    /** */ Type type;
    /** */ Token identifier;
    /** */ ExpressionNode assignExpression;
    /** */ TemplateValueParameterDefault templateValueParameterDefault;
    mixin OpEquals;
}

///
final class TemplateValueParameterDefault : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token, assignExpression));
    }
    /** */ ExpressionNode assignExpression;
    /** */ Token token;
    mixin OpEquals;
}

///
final class TernaryExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(orOrExpression, expression, ternaryExpression));
    }
    /** */ ExpressionNode orOrExpression;
    /** */ ExpressionNode expression;
    /** */ ExpressionNode ternaryExpression;
    /// Store this so that we know where the ':' is
    Token colon;
    mixin OpEquals;
}

deprecated("Replaced by ExpressionStatement + ThrowExpression")
alias ThrowStatement = ThrowExpression;

///
final class ThrowExpression: ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression));
    }

    /** */ ExpressionNode expression;
    mixin OpEquals;
}

///
final class TraitsExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(identifier, templateArgumentList));
    }
    /** */ Token identifier;
    /** */ TemplateArgumentList templateArgumentList;
    mixin OpEquals;
}

///
final class TryStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(declarationOrStatement, catches, finally_));
    }
    /** */ DeclarationOrStatement declarationOrStatement;
    /** */ Catches catches;
    /** */ Finally finally_;
    mixin OpEquals;
}

///
final class Type : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type2, typeSuffixes));
    }

    /** */ IdType[] typeConstructors;
    /** */ TypeSuffix[] typeSuffixes;
    /** */ Type2 type2;
    mixin OpEquals;
}

///
final class Type2 : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(typeofExpression, typeIdentifierPart, type,
            traitsExpression, vector, mixinExpression));
    }

    /** */ IdType builtinType;
    /** */ alias superOrThis = builtinType;
    /** */ TypeofExpression typeofExpression;
    /** */ TypeIdentifierPart typeIdentifierPart;
    /** */ IdType typeConstructor;
    /** */ Type type;
    /** */ TraitsExpression traitsExpression;
    /** */ Vector vector;
    /** */ MixinExpression mixinExpression;
    mixin OpEquals;
}

///
final class TypeSpecialization : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token, type));
    }
    /** */ Token token;
    /** */ Type type;
    mixin OpEquals;
}

///
final class TypeSuffix : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, low, high, delegateOrFunction, parameters,
            memberFunctionAttributes));
    }

    /** */ Token delegateOrFunction;
    /** */ Token star;
    /** */ bool array;
    /** */ Type type;
    /** */ ExpressionNode low;
    /** */ ExpressionNode high;
    /** */ Parameters parameters;
    /** */ MemberFunctionAttribute[] memberFunctionAttributes;
    mixin OpEquals;
}

///
final class TypeidExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type, expression));
    }
    /** */ Type type;
    /** */ Expression expression;
    mixin OpEquals;
}

///
final class TypeofExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression, return_));
    }
    /** */ Expression expression;
    /** */ Token return_;
    mixin OpEquals;
}

///
final class UnaryExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        // TODO prefix, postfix, unary
        mixin (visitIfNotNull!(primaryExpression, newExpression, deleteExpression,
            castExpression, functionCallExpression, unaryExpression,
            type, identifierOrTemplateInstance, assertExpression, throwExpression,
            indexExpression));
    }

    /** */ Type type;
    /** */ PrimaryExpression primaryExpression;
    /** */ Token prefix;
    /** */ Token suffix;
    /** */ UnaryExpression unaryExpression;
    /** */ NewExpression newExpression;
    /** */ DeleteExpression deleteExpression;
    /** */ CastExpression castExpression;
    /** */ FunctionCallExpression functionCallExpression;
    /** */ IdentifierOrTemplateInstance identifierOrTemplateInstance;
    /** */ AssertExpression assertExpression;
    /** */ ThrowExpression throwExpression;
    /** */ IndexExpression indexExpression;
    /** */ size_t dotLocation;
    mixin OpEquals;
}

///
final class UnionDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(name, templateParameters, constraint, structBody));
    }

    /** */ Token name;
    /** */ TemplateParameters templateParameters;
    /** */ Constraint constraint;
    /** */ StructBody structBody;
    /** */ string comment;
    mixin OpEquals;
}

///
final class Unittest : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(blockStatement));
    }
    /** */ BlockStatement blockStatement;
    /** */ string comment;
    /** */ size_t location;
    /** */ size_t line;
    /** */ size_t column;
    mixin OpEquals;
}

///
final class VariableDeclaration : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(storageClasses, type, declarators, autoDeclaration));
    }
    /** */ Type type;
    /** */ Declarator[] declarators;
    /** */ StorageClass[] storageClasses;
    /** */ AutoDeclaration autoDeclaration;
    /** */ string comment;
    mixin OpEquals;
}

///
final class Vector : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(type));
    }
    /** */ Type type;
    mixin OpEquals;
}

///
final class VersionCondition : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token));
    }
    /** */ size_t versionIndex;
    /** */ Token token;
    mixin OpEquals;
}

///
final class VersionSpecification : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(token));
    }
    /** */ Token token;
    mixin OpEquals;
}

///
final class WhileStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(condition, declarationOrStatement));
    }

    /** */ IfCondition condition;
    /** */ DeclarationOrStatement declarationOrStatement;
    /** */ size_t startIndex;
    mixin OpEquals;

    deprecated("use condition.expression") inout(Expression) expression() inout @property
    {
        if (!condition)
            return null;
        return condition.expression;
    }
}

///
final class WithStatement : BaseNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(expression, declarationOrStatement));
    }

    /** */ Expression expression;
    /** */ DeclarationOrStatement declarationOrStatement;
    mixin OpEquals;
}

///
final class XorExpression : ExpressionNode
{
    override void accept(ASTVisitor visitor) const
    {
        mixin (visitIfNotNull!(left, right));
    }
    mixin BinaryExpressionBody;
    mixin OpEquals;
}

unittest // issue #133
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;
    string src = q{module test133; void main(){}};
    final class TkTest : ASTVisitor
    {
        alias visit = ASTVisitor.visit;
        override void visit(const Token t){assert(t.text.length);}
    }
    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);
    Module m = ParserConfig(getTokensForParser(src, cf, &ca), "", &ra).parseModule();
    TkTest t = new TkTest;
    t.visit(m);
}

unittest // issue #165
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;
    string src = q{module test165; enum foo(T) = bar!T;};
    final class EpoTest : ASTVisitor
    {
        bool visited;
        alias visit = ASTVisitor.visit;
        override void visit(const EponymousTemplateDeclaration){visited = true;}
    }
    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);
    Module m = ParserConfig(getTokensForParser(src, cf, &ca), "", &ra).parseModule();
    EpoTest et = new EpoTest;
    et.visit(m);
    assert(et.visited);
}

unittest // issue #156
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    final class Test : ASTVisitor
    {
        bool arrIndex, arrValue, arrValueOnly, aaLiteral;
        alias visit = ASTVisitor.visit;
        override void visit(const ArrayInitializer ai)
        {
            if (ai.arrayMemberInitializations.length == 1)
            {
                arrIndex = ai.arrayMemberInitializations[0].assignExpression !is null;
                arrValue = ai.arrayMemberInitializations[0].nonVoidInitializer !is null;
                arrValueOnly = arrValue && !arrIndex;
            }
        }
        override void visit(const AssocArrayLiteral aal)
        {
            aaLiteral = true;
        }
    }

    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);

    {
        // no colon so array.
        string src1 = q{void main(){const arr = [[0]];}};
        Module m = parseModule(ParserConfig(getTokensForParser(src1, cf, &ca), "", &ra));
        Test t = new Test;
        t.visit(m);
        assert(t.arrValueOnly);
    }
    {
        // simple primary before colon, assume array.
        string src2 = q{void main(){const arr = [0:0];}};
        Module m = ParserConfig(getTokensForParser(src2, cf, &ca), "", &ra).parseModule();
        Test t = new Test;
        t.visit(m);
        assert(t.arrIndex);
        assert(t.arrValue);
        assert(!t.aaLiteral);
    }
    {
        // more complex exp before colon, assume AA.
        string src3 = q{void main(){const arr = [[0]:0];}};
        Module m = ParserConfig(getTokensForParser(src3, cf, &ca), "", &ra).parseModule();
        Test t = new Test;
        t.visit(m);
        assert(!t.arrIndex);
        assert(!t.arrValue);
        assert(t.aaLiteral);
    }
}

unittest // issue #170, issue #316
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    abstract class TestCase : ASTVisitor
    {
        string src;
        bool visited;
        this()
        {
            RollbackAllocator ra;
            LexerConfig cf = LexerConfig("", StringBehavior.source);
            StringCache ca = StringCache(16);
            Module m = ParserConfig(getTokensForParser(src, cf, &ca), "", &ra).parseModule();
            visit(m);
            assert(visited);
        }
    }

    class FunctionLiteralExpressionTestCase : TestCase
    {
        alias visit = ASTVisitor.visit;
        override void visit(const FunctionLiteralExpression){visited = true;}
    }

    class StructInitializerTestCase : TestCase
    {
        alias visit = ASTVisitor.visit;
        override void visit(const StructInitializer){visited = true;}
    }

    new class FunctionLiteralExpressionTestCase
    {this(){  TestCase.src = q{ void function() a = {call();};}; super(); }};

    new class FunctionLiteralExpressionTestCase
    {this(){  TestCase.src = q{ const a = {int i;};}; super(); }};

    new class FunctionLiteralExpressionTestCase
    {this(){  TestCase.src = q{ const a = {};}; super(); }};

    new class StructInitializerTestCase
    {this(){  TestCase.src = q{A a = {member : call()};}; super(); }};

    new class StructInitializerTestCase
    {this(){  TestCase.src = q{A a = {0};}; super(); }};
}

unittest // issue #193
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    final class Test193 : ASTVisitor
    {
        static string src = q{const(Type1[immutable(Type2)]) qualAarray;};
        size_t tc;
        alias visit = ASTVisitor.visit;
        override void visit(const TypeIdentifierPart tip)
        {
            tip.accept(this);
            assert(tip.indexer is null);
        }
        override void visit(const Type type)
        {
            tc++;
            if (tc == 1) //const(
            {
                assert(type.type2.typeConstructor == tok!"const");
                assert(type.type2.typeIdentifierPart is null);
            }
            else if (tc == 2) //const(Type1
            {
                assert(type.typeConstructors.length == 0);
                assert(type.type2.typeIdentifierPart.identifierOrTemplateInstance
                    .identifier.text == "Type1");
                assert(type.typeSuffixes.length == 1);
            }
            else if (tc == 3) // immutable(
            {
                assert(type.type2.typeConstructor == tok!"immutable");
                assert(type.type2.typeIdentifierPart is null);
            }
            else if (tc == 4) // immutable(Type2
            {
                assert(type.typeConstructors.length == 0);
                assert(type.type2.typeIdentifierPart.identifierOrTemplateInstance
                    .identifier.text == "Type2");
                assert(type.typeSuffixes.length == 0);
            }
            type.accept(this);
        }
    }

    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);

    Module m = ParserConfig(getTokensForParser(Test193.src, cf, &ca), "", &ra).parseModule();
    Test193 t193 = new Test193;
    t193.visit(m);
}

unittest // there used to be a small regression when adding the ParserConfig
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    auto src = q{module m;};

    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);

    Module m1 = parseModule(getTokensForParser(src, cf, &ca), "", &ra , null);
    Module m2 = parseModule(getTokensForParser(src, cf, &ca), "", &ra);
}

unittest //#318 : used to segfault
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    auto src = q{ auto a = new TestClass( };

    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);

    static void shut(string, size_t, size_t, string ,bool){}

    Module m1 = parseModule(getTokensForParser(src, cf, &ca), "", &ra , &shut);
}

unittest //#365 : used to segfault
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    auto src = " o[{scope(x ";

    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);

    static void shut(string, size_t, size_t, string ,bool){}

    Module m1 = parseModule(getTokensForParser(src, cf, &ca), "", &ra , &shut);
}

unittest // issue #398: Support extern(C++, <string expressions...>)
{
    import dparse.lexer : LexerConfig;
    import dparse.parser : parseModule, ParserConfig;
    import dparse.rollback_allocator : RollbackAllocator;

    RollbackAllocator ra;
    StringCache ca = StringCache(16);

    const(PrimaryExpression)[] getNamespaces(const string sourceCode)
    {
        final class Test398 : ASTVisitor
        {
            alias visit = ASTVisitor.visit;
            const(PrimaryExpression)[] namespaces;

            override void visit(const LinkageAttribute link)
            {
                assert(link.identifier.text == "C");
                assert(link.hasPlusPlus);
                assert(!link.typeIdentifierPart);
                assert(!link.classOrStruct);
                assert(link.cppNamespaces);
                super.visit(link);
            }

            override void visit(const NamespaceList list)
            {
                assert(list.items.length);
                assert(!namespaces);
                foreach (const entry; list.items)
                {
                    const prim = cast(PrimaryExpression) entry.expression;
                    assert(prim);
                    namespaces ~= prim;
                }
            }
        }

        LexerConfig cf = LexerConfig("", StringBehavior.source);
        Module m = ParserConfig(getTokensForParser(sourceCode, cf, &ca), "", &ra).parseModule();
        scope visitor = new Test398();
        visitor.visit(m);
        return visitor.namespaces;
    }

    void checkText(const PrimaryExpression pe, const string exp)
    {
        assert(pe);
        const act = pe.primary.text;
        assert(act == exp, '<' ~ act ~ '>');

    }

    auto ns = getNamespaces(`extern(C++, "foo") int i;`);
    assert(ns.length == 1);
    checkText(ns[0], `"foo"`);

    ns = getNamespaces(`extern(C++, "foo", "bar", "baz",) int i;`);
    assert(ns.length == 3);
    checkText(ns[0], `"foo"`);
    checkText(ns[1], `"bar"`);
    checkText(ns[2], `"baz"`);
}

unittest // issue #526
{
    import dparse.formatter, dparse.lexer, dparse.parser, dparse.rollback_allocator;
    string src = q{enum E : int*[0] { a = int*[0].init }};
    final class Test : ASTVisitor
    {
    }
    RollbackAllocator ra;
    auto cf = LexerConfig("", StringBehavior.source);
    auto ca = StringCache(16);
    Module m = ParserConfig(getTokensForParser(src, cf, &ca), "", &ra).parseModule();
    auto t = new Test;
    t.visit(m);
    assert(m.declarations.length == 1);
    auto ed = m.declarations[0].enumDeclaration;
    assert(ed);
    auto type = ed.type;
    auto app = appender!string();
    auto formatter = new Formatter!(typeof(app))(app);
    formatter.format(type);
    assert(app[] == "int*[0]");
    assert(ed.type.typeSuffixes.length == 2);
}

unittest // Differentiate between no and empty DDOC comments, e.g. for DDOC unittests
{
    import dparse.lexer, dparse.parser, dparse.rollback_allocator;

    auto src = q{
        ///
        unittest {}

        ///
        @safe pure unittest {}

        /****/ unittest {}

        /++++/ unittest {}

        /// This is a comment!
        unittest {}

        unittest {}
    };

    RollbackAllocator ra;
    LexerConfig cf = LexerConfig("", StringBehavior.source);
    StringCache ca = StringCache(16);
    Module m = parseModule(getTokensForParser(src, cf, &ca), "", &ra);

    final class UnittestVisitor : ASTVisitor
    {
        alias visit = ASTVisitor.visit;
        bool[size_t] found;

        override void visit(const Unittest test)
        {
            assert(test.line !in found);
            found[test.line] = true;

            switch (test.line)
            {
                case 3, 6, 8, 10:
                    assert(test.comment !is null);
                    assert(test.comment == "");
                    break;

                case 13:
                    assert(test.comment == "This is a comment!");
                    break;

                case 15:
                    assert(test.comment is null);
                    break;

                default:
                    assert(false, format("Unknown line: %d", test.line));
            }
        }
    }

    scope visitor = new UnittestVisitor();
    visitor.visit(m);
    assert(visitor.found.length == 6);
}

unittest // Support GCC-sytle asm statements
{
    static void verify(T)(const string code, void function(scope const T) handler)
    {
        import dparse.lexer, dparse.parser, dparse.rollback_allocator;

        RollbackAllocator ra;
        LexerConfig cf = LexerConfig("", StringBehavior.source);
        StringCache ca = StringCache(16);
        Module m = parseModule(getTokensForParser("void main() { " ~ code ~ '}', cf, &ca), "", &ra);

        final class AsmVisitor : ASTVisitor
        {
            alias visit = ASTVisitor.visit;
            bool found;

            override void visit(const T node)
            {
                assert(!found);
                found = true;
                handler(node);
            }
        }

        scope visitor = new AsmVisitor();
        visitor.visit(m);
        assert(visitor.found);
    }

    static void first(scope const AsmStatement stmt)
    {
        assert(stmt.asmInstructions.length == 0);
        assert(stmt.gccAsmInstructions.length == 1);
        with (stmt.gccAsmInstructions[0])
        {
            assert(assemblerTemplate);
            assert(assemblerTemplate.tokens.length == 1);
            assert(assemblerTemplate.tokens[0].type == tok!"stringLiteral");
            assert(assemblerTemplate.tokens[0].text == `"mov %0, EAX"`);

            assert(outputOperands);
            assert(outputOperands.items.length == 1);
            with (outputOperands.items[0])
            {
                assert(constraint.type == tok!"stringLiteral");
                assert(constraint.text == `"=r"`);

                auto una = cast(UnaryExpression) expression;
                assert(una);
                assert(una.primaryExpression.identifierOrTemplateInstance.identifier.text == "var1");
            }
        }
    }

    verify(q{ asm { "mov %0, EAX" : "=r" (var1) ; } }, &first);

    static void second(scope const AsmStatement stmt)
    {
        first(stmt);

        with (stmt.gccAsmInstructions[0])
        {
            assert(inputOperands);
            assert(inputOperands.items.length == 2);
            with (inputOperands.items[0])
            {
                assert(symbolicName.type == tok!"identifier");
                assert(symbolicName.text == "xy");

                assert(constraint.type == tok!"stringLiteral");
                assert(constraint.text == `"=w"`);

                auto una = cast(UnaryExpression) expression;
                assert(una);
                assert(una.primaryExpression.identifierOrTemplateInstance.identifier.text == "var2");
            }

            with (inputOperands.items[1])
            {
                assert(constraint.type == tok!"stringLiteral");
                assert(constraint.text == `"g"`);

                auto una = cast(UnaryExpression) expression;
                assert(una);
                assert(una.primaryExpression.identifierOrTemplateInstance.identifier.text == "var3");
            }
        }
    }

    verify(q{ asm { "mov %0, EAX" : "=r" (var1) : [xy] "=w" (var2), "g" (var3); } }, &second);

    verify(q{ asm { "mov %0, EAX" : "=r" (var1) : [xy] "=w" (var2), "g" (var3) : "r0" ; } }, (scope const AsmStatement stmt)
    {
        second(stmt);

        with (stmt.gccAsmInstructions[0])
        {
            assert(registers);
            assert(registers.items.length == 1);
            assert(registers.items[0].type == tok!"stringLiteral");
            assert(registers.items[0].text == `"r0"`);
        }
    });

    verify(q{ asm { "mov EBX, EAX" : : : "r0", "r1" ; } }, (scope const GccAsmInstruction instr)
    {
        with (instr)
        {
            assert(registers);
            assert(registers.items.length == 2);
            assert(registers.items[0].type == tok!"stringLiteral");
            assert(registers.items[0].text == `"r0"`);
            assert(registers.items[1].type == tok!"stringLiteral");
            assert(registers.items[1].text == `"r1"`);
        }
    });

    verify(q{ asm { "jmp LEnd" : : : : LEnd ; } }, (scope const GccAsmInstruction instr)
    {
        with (instr)
        {
            assert(gotos);
            assert(gotos.identifiers.length == 1);
            assert(gotos.identifiers[0].type == tok!"identifier");
            assert(gotos.identifiers[0].text == `LEnd`);
        }
    });
}