https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95970
--- Comment #4 from Ian Lance Taylor <ian at airs dot com> --- I'm having a hard time parsing the warning. It says gcc/go/gofrontend/types.cc:1474:34: warning: ‘this’ pointer null [-Wnonnull] The line is return type->do_type_descriptor(gogo, NULL); Is this trying to say that "type" may be NULL? That's true, it can be. This does look like a bug. There must be some reason that this code is never executed.