Backport "Heal occurrences of => T between ElimByName and Erasure" to LTS #20871
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There's a window of vulnerability between ElimByName and Erasure where some ExprTypes `=> T` that appear as parameters of function types are not yet converted to by-name functions `() ?=> T`. These would cause an assertion violation when used as operands of & or |. We fix this on the fly when forming these types in TypeComparer. As explained in ElimByName, we can't fix it beforehand by mapping all occurrences of `=> T` to `() ?=> T` since that could lead to cycles. Fixes #19548 [Cherry-picked 1ea4c86]
Avoids follow-up failures in Ycheck for the test case. [Cherry-picked 278beb8]
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No regressions detected in the community build up to lts-19605. |
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Backports #19558 to the LTS branch.
PR submitted by the release tooling.
[skip ci]