Replace TupleType::iterate_fields with get_fields

Fixes #735

Signed-off-by: Connor Lane Smith <cls@lubutu.com>

Author: cls

gcc/rust/typecheck/rust-tyty.cc

@@ -788,11 +788,11 @@ std::string
 TupleType::as_string () const
 {
   std::string fields_buffer;
-  iterate_fields ([&] (BaseType *field) mutable -> bool {
-    fields_buffer += field->as_string ();
-    fields_buffer += ", ";
-    return true;
-  });
+  for (const TyVar &field : get_fields ())
+    {
+      fields_buffer += field.get_tyty ()->as_string ();
+      fields_buffer += ", ";
+    }
   return "(" + fields_buffer + ")";
 }
 

gcc/rust/typecheck/rust-tyty.h

@@ -642,14 +642,7 @@ class TupleType : public BaseType
     return true;
   }
 
-  void iterate_fields (std::function<bool (BaseType *)> cb) const
-  {
-    for (size_t i = 0; i < num_fields (); i++)
-      {
-	if (!cb (get_field (i)))
-	  return;
-      }
-  }
+  const std::vector<TyVar> &get_fields () const { return fields; }
 
   std::string get_name () const override final { return as_string (); }