Gap analysis — c9 in decision #518

scry-mcdc · library/core/src/slice/mod.rs:4326 · branch 3477

Status: GAP

What you need

To prove condition c9 independently affects the decision, you need a row where c9 = F and the outcome differs from row 789 (where c9 = T).

Required condition vector:

  c0 = *
  c1 = *
  c2 = *
  c3 = F
  c4 = F
  c5 = F
  c6 = F
  c7 = T
  c8 = *
  c9 = F
  c10 = *
  c11 = *
  c12 = *
  c13 = *

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_d518_c9() {
    // Verdict: scry-mcdc
    // Source: library/core/src/slice/mod.rs:4326
    // Branch:  3477
    //
    // TODO: drive the function so condition c9 evaluates to the
    // value above and the resulting decision outcome differs from
    // the existing pair row.
    todo!("witness viz: gap drill-down for d#518/c9");
}

After adding the test, re-run: witness instrument && witness run --invoke run_row_NEW && witness report. The condition should flip from gap to proved.

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