Rollup merge of #62735 - petrochenkov:galloc, r=alexcrichton

Turn `#[global_allocator]` into a regular attribute macro

It was a 99% macro with exception of some diagnostic details.

As a result of the change, `#[global_allocator]` now works in nested modules and even in nameless blocks.

Fixes https://github.com/rust-lang/rust/issues/44113
Fixes https://github.com/rust-lang/rust/issues/58072

1 files changed, 5 insertions, 2 deletions

diff --git a/src/libsyntax_ext/test_case.rs b/src/libsyntax_ext/test_case.rs
index 355f2428e08..ea4a8d541ab 100644
--- a/src/libsyntax_ext/test_case.rs
+++ b/src/libsyntax_ext/test_case.rs
@@ -9,10 +9,11 @@
 // We mark item with an inert attribute "rustc_test_marker" which the test generation
 // logic will pick up on.
 
+use syntax::ast;
+use syntax::attr::check_builtin_macro_attribute;
 use syntax::ext::base::*;
 use syntax::ext::build::AstBuilder;
 use syntax::ext::hygiene::SyntaxContext;
-use syntax::ast;
 use syntax::source_map::respan;
 use syntax::symbol::sym;
 use syntax_pos::Span;
@@ -20,9 +21,11 @@ use syntax_pos::Span;
 pub fn expand(
     ecx: &mut ExtCtxt<'_>,
     attr_sp: Span,
-    _meta_item: &ast::MetaItem,
+    meta_item: &ast::MetaItem,
     anno_item: Annotatable
 ) -> Vec<Annotatable> {
+    check_builtin_macro_attribute(ecx, meta_item, sym::test_case);
+
     if !ecx.ecfg.should_test { return vec![]; }
 
     let sp = attr_sp.with_ctxt(SyntaxContext::empty().apply_mark(ecx.current_expansion.id));