hir-ty: add incremental tests checking for infer
invalidation
#19914
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This PR adds some tests that check that
infer
is invalidated when a DefMap is invalidated. These new tests will need to fixed and renamed #19837 by:adding_use_statement_invalidates_infer
toadding_use_statement_should_not_invalidate_infer
.events
assertion toassert!(!format!("{events:?}").contains("infer_shim"), "{events:#?}")
.(Full disclosure: I used Claude Sonnet 4 to write these tests. I am, of course, responsible for any code I submit for review, but it wasn't half bad at the job. I had to rename a few tests/example code in the tests, however.)