John McCall 9bf4e8c4a3 Remove a couple of over-eager assertions. ...

The best substitutions we can easily find in nested functions for
captured local variables are the forwarding substitutions of the
current environment.  These should be fine for type-substitution
purposes but do not necessarily match the generic signature of the
original variable's environment, which can trip these assertions.
Unfortunately, I can't think of an easy way to weaken these
assertions sufficiently to cover this case.

This should fix the source-compat suite regression reported in
rdar://107642925.

2023-04-14 02:04:47 -04:00

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