Merge #998

998: Parse macro expansion properly r=CohenArthur a=CohenArthur

This PR adds a base for trying to parse statements or items in macro invocations. We are now able to parse multiple items / expressions / statements properly, but do not lower them properly, which is the last remaining task in #943 

New macro parsing logic:
```mermaid
flowchart TD;
    has_semi -- Yes --> stmt;
    has_semi -- No --> invocation;
    invocation -- Is Parens --> expr;
    invocation -- Is Square --> expr;
    invocation -- Is Curly --> stmt;
```

Closes #943 
Closes #959 
Closes #952 

Co-authored-by: Arthur Cohen <arthur.cohen@embecosm.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/gcc/rust/resolve/rust-ast-resolve-expr.h b/gcc/rust/resolve/rust-ast-resolve-expr.h
index d8bd203..a049ba1 100644
--- a/gcc/rust/resolve/rust-ast-resolve-expr.h
+++ b/gcc/rust/resolve/rust-ast-resolve-expr.h
@@ -62,8 +62,6 @@ public:
   static void go (AST::Expr *expr, NodeId parent, const CanonicalPath &prefix,
 		  const CanonicalPath &canonical_prefix);
 
-  void visit (AST::MacroInvocation &expr) override;
-
   void visit (AST::TupleIndexExpr &expr) override;
 
   void visit (AST::TupleExpr &expr) override;