Slava Pestov 290701cb4d Sema: Ban shadowing generic parameters from outer scopes ...

Code like that is usually indicative of programmer error, and does not
round-trip through module interface files since there is no source
syntax to refer to an outer generic parameter.

For source compatibility this is a warning, but becomes an error with
-swift-version 6.

Fixes rdar://problem/108385980 and https://github.com/apple/swift/issues/62767.

2023-04-25 17:41:23 -04:00

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