Gap analysis — c4 in decision #609

scry-mcdc · lib.rs:4198 · branch 4041

Status: GAP

What you need

To prove condition c4 independently affects the decision, you need a row where c4 = T and the outcome differs from row 16743 (where c4 = F).

Required condition vector:

  c0 = T
  c1 = F
  c2 = *
  c3 = *
  c4 = T

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_d609_c4() {
    // Verdict: scry-mcdc
    // Source: lib.rs:4198
    // Branch:  4041
    //
    // TODO: drive the function so condition c4 evaluates to the
    // value above and the resulting decision outcome differs from
    // the existing pair row.
    todo!("witness viz: gap drill-down for d#609/c4");
}

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 #609