diff -r 7975dbfdedb1 go/types.cc
--- a/go/types.cc	Tue Dec 21 13:12:12 2010 -0800
+++ b/go/types.cc	Tue Dec 21 14:29:10 2010 -0800
@@ -3698,6 +3698,8 @@
 void
 Struct_type::finalize_methods(Gogo* gogo)
 {
+  if (this->all_methods_ != NULL)
+    return;
   Type::finalize_methods(gogo, this, this->location_, &this->all_methods_);
 }
 
@@ -6615,6 +6617,9 @@
 void
 Named_type::finalize_methods(Gogo* gogo)
 {
+  if (this->all_methods_ != NULL)
+    return;
+
   if (this->local_methods_ != NULL
       && (this->points_to() != NULL || this->interface_type() != NULL))
     {