gcc-4.9/gcc/testsuite/gcc.dg/struct-in-proto-1.c


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/* { dg-do compile } */
/* { dg-options "-w" } */
int foo(struct S { int i; } s) {
  return sizeof(struct S); /* { dg-bogus "incomplete type" "S visible here" } */
}
int bar(void) {
  return sizeof(struct S); /* { dg-error "incomplete type" "not here" } */
}