Gap analysis — c8 in decision #577

scry-mcdc · library/core/src/slice/cmp.rs:426 · branch 3975

Status: GAP

What you need

To prove condition c8 independently affects the decision, you need a row where c8 = F and the outcome differs from row 1332 (where c8 = T).

Required condition vector:

  c0 = *
  c1 = F
  c2 = *
  c3 = *
  c4 = T
  c5 = F
  c6 = T
  c7 = *
  c8 = F

Conditions marked * were short-circuited in the baseline row; the new test must drive inputs so they get evaluated to either T or F.

Suggested test stub

#[test]
fn closes_gap_d577_c8() {
    // Verdict: scry-mcdc
    // Source: library/core/src/slice/cmp.rs:426
    // Branch:  3975
    //
    // TODO: drive the function so condition c8 evaluates to the
    // value above and the resulting decision outcome differs from
    // the existing pair row.
    todo!("witness viz: gap drill-down for d#577/c8");
}

After adding the test, re-run: witness instrument && witness run --invoke run_row_NEW && witness report. The condition should flip from gap to proved.

← back to decision #577