[swift-evolution] [Pitch] Support for pure functions. Part n + 1.

[Anton Zhilin]

Just let

@pure func foo(_ f: (Int) -> Int) -> Int

be the same as those two combined:

@pure func foo(_ f: @pure (Int) -> Int) -> Int
func foo(_ f: (Int) -> Int) -> Int

No need for anything like “re-pure” or ≃>.
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