Gap analysis — c0 in decision #705
scry-mcdc · library/core/src/iter/traits/iterator.rs:2558 · branch 5057
Status: GAP
What you need
To prove condition c0 independently affects the decision, you need a row where c0 = T and the outcome differs from row 81142 (where c0 = F).
Required condition vector:
c0 = T c1 = *
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_d705_c0() {
// Verdict: scry-mcdc
// Source: library/core/src/iter/traits/iterator.rs:2558
// Branch: 5057
//
// TODO: drive the function so condition c0 evaluates to the
// value above and the resulting decision outcome differs from
// the existing pair row.
todo!("witness viz: gap drill-down for d#705/c0");
}
After adding the test, re-run: witness instrument && witness run --invoke run_row_NEW && witness report. The condition should flip from gap to proved.