I know what else it might find either, but I still think it's worth running property-based tests in CI to find out!  The demo I wrote for my language summit talk doesn't have any parser tests, but still would have caught this bug in the pull request that introduced it.


The specific reproducer here is odd, because it's reported as an internal error in Hypothesmith - I use the `compile()` builtin to check that strings valid against an approximate grammar are actually valid.

It's structurally less complex than typical outputs because it's only a fragment of the tree being generated, but because shrinking doesn't run for generation-time errors it's also much harder to interpret than usual.