Port #[prelude_import] to the attribute parser

Author: Ozzy1423

compiler/rustc_attr_parsing/src/attributes/rustc_internal.rs

@@ -1211,3 +1211,12 @@ impl<S: Stage> SingleAttributeParser<S> for RustcReservationImplParser {
         Some(AttributeKind::RustcReservationImpl(cx.attr_span, value_str))
     }
 }
+
+pub(crate) struct PreludeImportParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for PreludeImportParser {
+    const PATH: &[Symbol] = &[sym::prelude_import];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Use)]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::PreludeImport;
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -258,6 +258,7 @@ attribute_parsers!(
         Single<WithoutArgs<PassByValueParser>>,
         Single<WithoutArgs<PinV2Parser>>,
         Single<WithoutArgs<PointeeParser>>,
+        Single<WithoutArgs<PreludeImportParser>>,
         Single<WithoutArgs<ProcMacroAttributeParser>>,
         Single<WithoutArgs<ProcMacroParser>>,
         Single<WithoutArgs<ProfilerRuntimeParser>>,

compiler/rustc_hir/src/attrs/data_structures.rs

@@ -1053,6 +1053,9 @@ pub enum AttributeKind {
     /// Represents `#[pointee]`
     Pointee(Span),
 
+    /// Represents `#[prelude_import]`
+    PreludeImport,
+
     /// Represents `#[proc_macro]`
     ProcMacro(Span),
 

compiler/rustc_hir/src/attrs/encode_cross_crate.rs

@@ -82,6 +82,7 @@ impl AttributeKind {
             PatternComplexityLimit { .. } => No,
             PinV2(..) => Yes,
             Pointee(..) => No,
+            PreludeImport => No,
             ProcMacro(..) => No,
             ProcMacroAttribute(..) => No,
             ProcMacroDerive { .. } => No,

compiler/rustc_passes/src/check_attr.rs

@@ -282,6 +282,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     | AttributeKind::PatternComplexityLimit { .. }
                     | AttributeKind::PinV2(..)
                     | AttributeKind::Pointee(..)
+                    | AttributeKind::PreludeImport
                     | AttributeKind::ProfilerRuntime
                     | AttributeKind::RecursionLimit { .. }
                     | AttributeKind::ReexportTestHarnessMain(..)
@@ -394,7 +395,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                             // need to be fixed
                             | sym::deprecated_safe // FIXME(deprecated_safe)
                             // internal
-                            | sym::prelude_import
                             | sym::panic_handler
                             | sym::lang
                             | sym::default_lib_allocator