Joe Groff e46168c626 SILGen: Improve handling of copyable subpatterns in borrowing switches. ...

A `let` binding of a copyable subpattern can create an independent variable
which should be copyable and consumable without affecting a borrowed
move-only base. In the same way that `borrowing` parameters are
no-implicit-copy, though, explicitly `_borrowing` subpatterns of
copyable type should be no-implicit-copy as well.

2024-02-07 07:21:11 -08:00

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