/* This used to ICE because there was no null check in   check_bitfield_type_and_width. */struct tree_common{  enum tree_code code : 8; /* { dg-error "ISO C forbids forward references to" "" } */  /* { dg-error "type of bit-field .code. is a GCC extension" "" { target *-*-* } 6 } */  /* { dg-warning "narrower than values of its type" "" { target *-*-* } 6 } */  /* { dg-error "incomplete type" "" { target *-*-* } 6 } */};