Function robustness_probe

tests/repro/repro_grammar_scientific.c:213–231

── Robustness probe ─────────────────────────────────────────────────────── * * Feed a deliberately malformed/truncated fixture through the single-file * extractor. The ONLY invariant here is liveness: the call must RETURN (a hard * crash would not). NULL or a result are both acceptable; if a result comes * back its ranges must still be well-formed (no negative/inverted lines). * Returns 0 o

 * Returns 0 on PASS (returned + ranges sane), 1 on FAIL.
 */
static int robustness_probe(const char *lang_tag, const char *bad_src,
                            CBMLanguage lang, const char *file) {
    const char *RED = tf_red();
    const char *RST = tf_reset();
    CBMFileResult *r = inv_rx(bad_src, lang, file);
    if (!r) {
        /* Returned cleanly with NULL -- acceptable, no crash. */
        return 0;
    }
    int bad_ranges = inv_count_bad_ranges(r);
    cbm_free_result(r);
    if (bad_ranges != 0) {
        printf("  %sFAIL%s  [%s] robustness: malformed input produced %d def(s) "
               "with invalid range\n",
               RED, RST, lang_tag, bad_ranges);
        return 1;
    }
    return 0;
}

/* ── GLSL ────────────────────────────────────────────────────────────────────
 * Shader; reuses C node types (c_func_types / c_call_types). Idiomatic: a helper