if (old_definition != NULL) {
if (!pp_definitions_equal(old_definition, new_definition)) {
warningf(&input.position, "multiple definition of macro '%Y' (first defined %P)",
if (old_definition != NULL) {
if (!pp_definitions_equal(old_definition, new_definition)) {
warningf(&input.position, "multiple definition of macro '%Y' (first defined %P)",