Open Radar

 
Summary:
Hello, this (minimal and artificial-looking) code won't compile, with an unexpected error message:

    protocol P1 { init() }
    protocol P2 { }

    extension Optional where Wrapped: P1 {
        func f() -> Wrapped {   // f1 variant
            return Wrapped()
        }
        func g() -> Wrapped {   // g1 variant
            return f()
        }
    }

    extension Optional where Wrapped: protocol<P1, P2> {
        func f() -> Wrapped {   // f2 variant
            return Wrapped()
        }
        func g() -> Wrapped {   // g2 variant
            return f()          // Expect f2 variant
        }
    }

Steps to Reproduce:
Compile the code above.

Expected Results:
The code compile, and the g2 variant of g() calls the f2 variant of f().

Actual Results:
The code does not compile, with the following error:

    Playground execution failed: playground.swift:18:16: error: ambiguous use of 'f()'
            return f()
                   ^
    playground.swift:5:10: note: found this candidate
        func f() -> Wrapped {
             ^
    playground.swift:14:10: note: found this candidate
        func f() -> Wrapped {
             ^


Version:
Xcode 7.0 (7A218
OSX 10.10.5 (14F27)