Port #[rustc_test_marker] to the attribute parser

compiler/rustc_attr_parsing/src/attributes/test_attrs.rs

@@ -257,3 +257,36 @@ impl<S: Stage> SingleAttributeParser<S> for TestRunnerParser {
         Some(AttributeKind::TestRunner(meta.path().0.clone()))
     }
 }
+
+pub(crate) struct RustcTestMarkerParser;
+
+impl<S: Stage> SingleAttributeParser<S> for RustcTestMarkerParser {
+    const PATH: &[Symbol] = &[sym::rustc_test_marker];
+    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepOutermost;
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
+        Allow(Target::Const),
+        Allow(Target::Fn),
+        Allow(Target::Static),
+    ]);
+    const TEMPLATE: AttributeTemplate = template!(NameValueStr: "test_path");
+
+    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser) -> Option<AttributeKind> {
+        let Some(name_value) = args.name_value() else {
+            cx.expected_name_value(cx.attr_span, Some(sym::rustc_test_marker));
+            return None;
+        };
+
+        let Some(value_str) = name_value.value_as_str() else {
+            cx.expected_string_literal(name_value.value_span, None);
+            return None;
+        };
+
+        if value_str.as_str().trim().is_empty() {
+            cx.expected_non_empty_string_literal(name_value.value_span);
+            return None;
+        }
+
+        Some(AttributeKind::RustcTestMarker(value_str))
+    }
+}

compiler/rustc_attr_parsing/src/context.rs

@@ -215,6 +215,7 @@ attribute_parsers!(
         Single<RustcScalableVectorParser>,
         Single<RustcSimdMonomorphizeLaneLimitParser>,
         Single<RustcSymbolName>,
+        Single<RustcTestMarkerParser>,
         Single<SanitizeParser>,
         Single<ShouldPanicParser>,
         Single<SkipDuringMethodDispatchParser>,

compiler/rustc_hir/src/attrs/data_structures.rs

@@ -1326,6 +1326,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_symbol_name]`
     RustcSymbolName(Span),
 
+    /// Represents `#[rustc_test_marker]`
+    RustcTestMarker(Symbol),
+
     /// Represents `#[rustc_then_this_would_need]`
     RustcThenThisWouldNeed(Span, ThinVec<Ident>),
 

compiler/rustc_hir/src/attrs/encode_cross_crate.rs

@@ -167,6 +167,7 @@ impl AttributeKind {
             RustcStdInternalSymbol(..) => No,
             RustcStrictCoherence(..) => Yes,
             RustcSymbolName(..) => Yes,
+            RustcTestMarker(..) => No,
             RustcThenThisWouldNeed(..) => No,
             RustcTrivialFieldReads => Yes,
             RustcUnsafeSpecializationMarker(..) => No,

compiler/rustc_passes/src/check_attr.rs

@@ -358,6 +358,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                     | AttributeKind::RustcStdInternalSymbol (..)
                     | AttributeKind::RustcStrictCoherence(..)
                     | AttributeKind::RustcSymbolName(..)
+                    | AttributeKind::RustcTestMarker(..)
                     | AttributeKind::RustcThenThisWouldNeed(..)
                     | AttributeKind::RustcTrivialFieldReads
                     | AttributeKind::RustcUnsafeSpecializationMarker(..)
@@ -404,7 +405,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                             | sym::rustc_on_unimplemented
                             | sym::rustc_do_not_const_check
                             | sym::rustc_doc_primitive
-                            | sym::rustc_test_marker
                             | sym::rustc_layout
                             | sym::rustc_proc_macro_decls
                             | sym::rustc_autodiff