Gap analysis — c3 in decision #838
scry-mcdc · malloc.c:4778 · branch 5905
Status: GAP
What you need
To prove condition c3 independently affects the decision, you need a row where c3 = F and the outcome differs from row 2233 (where c3 = T).
Required condition vector:
c0 = * c1 = * c2 = * c3 = F c4 = F c5 = 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_d838_c3() {
// Verdict: scry-mcdc
// Source: malloc.c:4778
// Branch: 5905
//
// TODO: drive the function so condition c3 evaluates to the
// value above and the resulting decision outcome differs from
// the existing pair row.
todo!("witness viz: gap drill-down for d#838/c3");
}
After adding the test, re-run: witness instrument && witness run --invoke run_row_NEW && witness report. The condition should flip from gap to proved.