The Go language recently added a new predefined type, named "error", which is an interface type with a single method, Error. This patch, from Rémy Oudompheng, implements this type for gccgo. Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu. Committed to mainline.
Ian
diff -r 9f8ff21f7771 go/gogo.cc --- a/go/gogo.cc Mon Nov 28 22:51:39 2011 -0800 +++ b/go/gogo.cc Mon Nov 28 22:52:22 2011 -0800 @@ -97,6 +97,18 @@ this->add_named_type(Type::make_named_string_type()); + // "error" is interface { Error() string }. + { + Typed_identifier_list *methods = new Typed_identifier_list; + Typed_identifier_list *results = new Typed_identifier_list; + results->push_back(Typed_identifier("", Type::lookup_string_type(), loc)); + Type *method_type = Type::make_function_type(NULL, NULL, results, loc); + methods->push_back(Typed_identifier("Error", method_type, loc)); + Type *error_iface = Type::make_interface_type(methods, loc); + Named_type *error_type = Named_object::make_type("error", NULL, error_iface, loc)->type_value(); + this->add_named_type(error_type); + } + this->globals_->add_constant(Typed_identifier("true", Type::make_boolean_type(), loc),