port `#[no_core]` to the new attribute parsing infrastructure

2 files changed, 15 insertions, 2 deletions

diff --git a/compiler/rustc_attr_parsing/src/attributes/crate_level.rs b/compiler/rustc_attr_parsing/src/attributes/crate_level.rs
index d23a7ae72f8..d2e28ed97aa 100644
--- a/compiler/rustc_attr_parsing/src/attributes/crate_level.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/crate_level.rs
@@ -176,3 +176,15 @@ impl<S: Stage> SingleAttributeParser<S> for PatternComplexityLimitParser {
         })
     }
 }
+
+pub(crate) struct NoCoreParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for NoCoreParser {
+    const PATH: &[Symbol] = &[sym::no_core];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    // FIXME: recursion limit is allowed on all targets and ignored,
+    //        even though it should only be valid on crates of course
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(ALL_TARGETS);
+    const CREATE: fn(Span) -> AttributeKind = AttributeKind::NoCore;
+    const TYPE: AttributeType = AttributeType::CrateLevel;
+}
diff --git a/compiler/rustc_attr_parsing/src/context.rs b/compiler/rustc_attr_parsing/src/context.rs
index 98e86838a3a..3d532d432b5 100644
--- a/compiler/rustc_attr_parsing/src/context.rs
+++ b/compiler/rustc_attr_parsing/src/context.rs
@@ -25,8 +25,8 @@ use crate::attributes::codegen_attrs::{
 };
 use crate::attributes::confusables::ConfusablesParser;
 use crate::attributes::crate_level::{
-    CrateNameParser, MoveSizeLimitParser, PatternComplexityLimitParser, RecursionLimitParser,
-    TypeLengthLimitParser,
+    CrateNameParser, MoveSizeLimitParser, NoCoreParser, PatternComplexityLimitParser,
+    RecursionLimitParser, TypeLengthLimitParser,
 };
 use crate::attributes::deprecation::DeprecationParser;
 use crate::attributes::dummy::DummyParser;
@@ -222,6 +222,7 @@ attribute_parsers!(
         Single<WithoutArgs<MacroEscapeParser>>,
         Single<WithoutArgs<MarkerParser>>,
         Single<WithoutArgs<MayDangleParser>>,
+        Single<WithoutArgs<NoCoreParser>>,
         Single<WithoutArgs<NoImplicitPreludeParser>>,
         Single<WithoutArgs<NoMangleParser>>,
         Single<WithoutArgs<NonExhaustiveParser>>,