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fun/src/vm/strings/find.c

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case OP_FIND: {
Value needle = pop_value(vm);
Value hay = pop_value(vm);
if (hay.type != VAL_STRING || needle.type != VAL_STRING) {
fprintf(stderr, "Runtime type error: FIND expects (string, string)\n");
exit(1);
}
int idx = bi_find(&hay, &needle);
free_value(hay);
free_value(needle);
push_value(vm, make_int(idx));
break;
}