| ### Compilation failed: | |
| error: 1: unknown identifier 'x' | |
| error: 2: unknown identifier 'x' | |
| error: 3: unknown identifier 'x' | |
| error: 4: unknown identifier 'x' | |
| error: 4: unknown identifier 'z' | |
| error: 6: unknown identifier 'f' | |
| error: 6: unknown identifier 'h' | |
| error: 7: unknown identifier 'j' | |
| 8 errors |