clang-tests/gcc-4_2-testsuite/src/g++.dg/parse/error12.C

// { dg-do compile }
// Origin: Giovanni Bajo <giovannibajo at gcc dot gnu dot org>
// Make sure the error about '<:' can be turned into a warning
// { dg-options "-fpermissive" }

struct B;

template <class A>
struct Foo {};

Foo<::B> foo; // { dg-error "" }