Sample more directly inspired by the missing annotation on a `Map.compute` override itself.
Sample more directly inspired by the missing annotation on a `Map.compute` override itself.

This is similar to
https://github.com/jspecify/jspecify/commit/07cf26f9ac9f55b69880728d82fe352b11c68b13,
but this commit's sample is about the misdeclaration of the override.
The other commit's sample is about the resulting mismatch for a _call_
made inside the _implementation_ of that override.

jspecify/jspecify