SYM_BAD
[SYM_BAD] = "SYM_BAD",
.type = SYM_BAD,
sym = alloc_symbol(expr->pos, SYM_BAD);
static int type_class[SYM_BAD + 1] = {
[SYM_BAD] = "bad.",
[SYM_BAD] = "bad"};
if (type <= SYM_BAD)