In general "failing to run (successfully)" should per-see been seen as a bad signal.

It might still be:

- the closest to a correct solution the model can produce

- be helpful to find out what it wrong

- might be intended (e.g. in a typical very short red->green unit test dev approach you want to generate some code which doesn't run correctly _just yet_). Test for newly found bugs are supposed to fail (until the bug is fixed). Etc.

- if "making run" means removing sanity checks, doing something semantically completely different or similar it's like the OP author said on of the worst outcomes