Handle attributes in expression macros

gcc/rust/ChangeLog:

	* expand/rust-macro-expand.cc (transcribe_expression): Parse any
	outer attributes before parsing an expression.
	* parse/rust-parse.h (Parser::parse_outer_attributes): Make
	public.

gcc/testsuite/ChangeLog:

	* rust/compile/attr-macro.rs: New test.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

Author: powerboat9

gcc/rust/expand/rust-macro-expand.cc

@@ -961,7 +961,8 @@ transcribe_expression (Parser<MacroInvocLexer> &parser)
   auto &lexer = parser.get_token_source ();
   auto start = lexer.get_offs ();
 
-  auto expr = parser.parse_expr ();
+  auto attrs = parser.parse_outer_attributes ();
+  auto expr = parser.parse_expr (std::move (attrs));
   if (expr == nullptr)
     return AST::Fragment::create_error ();
 

gcc/rust/parse/rust-parse.h

@@ -212,6 +212,11 @@ template <typename ManagedTokenSource> class Parser
   std::unique_ptr<AST::MacroInvocation>
   parse_macro_invocation (AST::AttrVec outer_attrs);
 
+  /*
+   * This has to be public for parsing expressions with outer attributes
+   */
+  AST::AttrVec parse_outer_attributes ();
+
 private:
   void skip_after_semicolon ();
   void skip_after_end ();
@@ -228,7 +233,6 @@ template <typename ManagedTokenSource> class Parser
 
   // AST-related stuff - maybe move or something?
   AST::Attribute parse_inner_attribute ();
-  AST::AttrVec parse_outer_attributes ();
   AST::Attribute parse_outer_attribute ();
   std::unique_ptr<AST::AttrInput> parse_attr_input ();
   std::tuple<AST::SimplePath, std::unique_ptr<AST::AttrInput>, location_t>

gcc/testsuite/rust/compile/attr-macro.rs

@@ -0,0 +1,7 @@
+macro_rules! foo {
+    () => { #[cfg(all())] 12 }
+}
+
+fn main() -> i32 {
+    foo!()
+}