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Slava Pestov
6c211745f6
It looks like originally, we would only infer bindings from a KeyPath type, which has invariant generic arguments. However, nowadays we can infer a keypath root type from a function type as well, because we allow keypath to function conversions. So, if we inferred the key path root type through a function type, then in fact we cannot introduce it as an exact binding, and we must preserve variance. This fixes a test failure that appears with a subsequent change I'm making.