Gap analysis — c4 in decision #57
scry-mcdc · library/core/src/option.rs:2845 · branch 448
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 40285 (where c4 = F).
Required condition vector:
c0 = F c1 = F c2 = F c3 = F c4 = T c5 = F c6 = *
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_d57_c4() {
// Verdict: scry-mcdc
// Source: library/core/src/option.rs:2845
// Branch: 448
//
// 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#57/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.