gcc/testsuite/g++.dg/template/error17.C

// PR c++/20153

template <typename T>
void
foo()
{
  union { struct { }; }; // { dg-error "18:ISO C\\+\\+ prohibits anonymous struct" }
  // { dg-error "18:anonymous struct not inside" "not inside" { target *-*-* } .-1 }
}