Gap analysis — c2 in decision #303

scry-mcdc · library/core/src/result.rs:2173 · branch 2064

Status: GAP

What you need

To prove condition c2 independently affects the decision, you need a row where c2 = T and the outcome differs from row 40922 (where c2 = F).

Required condition vector:

  c0 = *
  c1 = T
  c2 = 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_d303_c2() {
    // Verdict: scry-mcdc
    // Source: library/core/src/result.rs:2173
    // Branch:  2064
    //
    // TODO: drive the function so condition c2 evaluates to the
    // value above and the resulting decision outcome differs from
    // the existing pair row.
    todo!("witness viz: gap drill-down for d#303/c2");
}

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 #303