| Element | Missed Instructions | Cov. | Missed Branches | Cov. | Missed | Cxty | Missed | Lines | Missed | Methods |
| Total | 41 of 67 | 39% | 1 of 2 | 50% | 4 | 5 | 1 | 5 | 3 | 4 |
| prefixDecrementOperationToCeylon(Tree.DecrementOp, Callable) | | 62% | | 50% | 1 | 2 | 0 | 4 | 0 | 1 |
| prefixDecrementOperationToCeylon$update(Tree.DecrementOp) | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 | |
| prefixDecrementOperationToCeylon(Tree.DecrementOp) | | 0% | n/a | 1 | 1 | 1 | 1 | 1 | 1 | |
| prefixDecrementOperationToCeylon_() | | 0% | n/a | 1 | 1 | 0 | 0 | 1 | 1 |