modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/compile/pr48767.c (about)

     1  /* PR target/48767 */
     2  
     3  void
     4  foo (__builtin_va_list ap)
     5  {
     6    __builtin_va_arg (ap, void); /* { dg-error "second argument to .va_arg. is of incomplete type .void." } */
     7  }