Doug Gregor a9260f2d9a [GSB] Don't warn about redundancies due to inference from result types. ...

When we infer a requirement from the result type of a function, don't
warn if that requirement was also stated explicitly. This has been a
point of confusion since we introduced the redundancy warnings,
because users don't consider to result type to be an "input" to the
function in the way the compiler does. So, while technically it is
"correct" to warn, it's unintuitive---so stop.

Fixes SR-5072 / rdar://problem/31357967.

2017-06-16 13:45:07 -07:00

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