gh-138890: Add clearer message when deleting builtins with del
#4066
| Job | Run time |
|---|---|
| 9m 46s | |
| 11m 43s | |
| 20m 28s | |
| 17m 26s | |
| 19m 53s | |
| 22m 59s | |
| 14m 32s | |
| 11m 34s | |
| 17m 47s | |
| 12m 19s | |
| 18m 2s | |
| 10m 53s | |
| 5m 52s | |
| 8m 44s | |
| 13m 26s | |
| 7m 28s | |
| 3h 42m 52s |