gccrs: [E0658] Unstable langauge feature

gcc/rust/ChangeLog:

	* checks/errors/rust-const-checker.cc (ConstChecker::visit):
	Use of mutable reference in constant functions.
	* checks/errors/rust-feature-gate.cc (FeatureGate::gate):
	ErrorCode for intrinsics are subject to change.

Signed-off-by: Muhammad Mahad <[email protected]>

Author: MahadMuhammad

gcc/rust/checks/errors/rust-const-checker.cc

@@ -862,7 +862,7 @@ void
 ConstChecker::visit (ReferenceType &type)
 {
   if (const_context.is_in_context () && type.is_mut ())
-    rust_error_at (type.get_locus (),
+    rust_error_at (type.get_locus (), ErrorCode::E0658,
 		   "mutable references are not allowed in constant functions");
 }
 

gcc/rust/checks/errors/rust-feature-gate.cc

@@ -86,7 +86,7 @@ FeatureGate::gate (Feature::Name name, location_t loc,
 	{
 	  const char *fmt_str
 	    = "%s. add `#![feature(%s)]` to the crate attributes to enable.";
-	  rust_error_at (loc, fmt_str, error_msg.c_str (),
+	  rust_error_at (loc, ErrorCode::E0658, fmt_str, error_msg.c_str (),
 			 feature.as_string ().c_str ());
 	}
     }