Fix named error paremeter encoding order in IR codegen

Author: nikola-matic

Changelog.md

@@ -12,6 +12,7 @@ Compiler Features:
 * Yul EVM Code Transform: Improve stack shuffler performance by fixing a BFS deduplication issue.
 
 Bugfixes:
+* Yul IR Code Generation: Encode custom error named parameters in declaration order instead of call-site order.
 
 
 ### 0.8.34 (2026-02-18)

libsolidity/codegen/ir/IRGeneratorForStatements.cpp

@@ -1168,7 +1168,7 @@ void IRGeneratorForStatements::endVisit(FunctionCall const& _functionCall)
 		{
 			auto const& errorConstructorCall = dynamic_cast<FunctionCall const&>(*arguments[1]);
 			appendCode() << m_utils.requireWithErrorFunction(errorConstructorCall) << "(" <<IRVariable(*arguments[0]).name();
-			for (auto argument: errorConstructorCall.arguments())
+			for (auto argument: errorConstructorCall.sortedArguments())
 				if (argument->annotation().type->sizeOnStack() > 0)
 					appendCode() << ", " << IRVariable(*argument).commaSeparatedList();
 			appendCode() << ")\n";

test/libsolidity/semanticTests/errors/require_error_named_parameters.sol

@@ -0,0 +1,24 @@
+error NamedArgsError2(uint256 a, uint256 b);
+error NamedArgsError3(uint256 a, uint256 b, uint256 c);
+error NamedArgsError4(uint256 a, string b, uint256 c, bool d);
+
+contract C {
+    function trigger1() external pure {
+        require(false, NamedArgsError2({a: 2, b: 7}));
+    }
+    function trigger2() external pure {
+        require(false, NamedArgsError2({b: 7, a: 2}));
+    }
+    function trigger3() external pure {
+        require(false, NamedArgsError3({c: 9, a: 2, b: 7}));
+    }
+    function trigger4() external pure {
+        require(false, NamedArgsError4({b: "error", a: 2, c: 9, d: true}));
+    }
+}
+
+// ----
+// trigger1() -> FAILURE, hex"59f176a3", 2, 7
+// trigger2() -> FAILURE, hex"59f176a3", 2, 7
+// trigger3() -> FAILURE, hex"b912b8d4", 2, 7, hex"0000000000000000000000000000000000000000000000000000000000000009"
+// trigger4() -> FAILURE, hex"8ae9981b", 2, hex"0000000000000000000000000000000000000000000000000000000000000080", 9, true, 5, hex"6572726f72000000000000000000000000000000000000000000000000000000"