Gap analysis — c2 in decision #286
scry-mcdc · library/alloc/src/fmt.rs:659 · branch 2245
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 785 (where c2 = F).
Required condition vector:
c0 = T c1 = * 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_d286_c2() {
// Verdict: scry-mcdc
// Source: library/alloc/src/fmt.rs:659
// Branch: 2245
//
// 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#286/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.