Open Radar

 
I’m not 100% sure that I have the syntax correct here, but no variation seems to work either.

With this parenthesization, the compiler seems to accept the function header line, but it appears to be confused about the actual types involved.

The intent: given an item of type A and a sequence of functions that map type A to type B, return an array containing the Bs generated by the functions in the sequence.

func multiTransform<A, B, S: SequenceType where S.Generator.Element == ((A)->(B))>(seq: S, elt: A) -> [B] {
    var results = [B]()
    for xformFunc in seq {
        var xformed: B
        var foo: A->B = xformFunc  // Error: S.Generator.Element is not convertible to A->b
        xformed = xformFunc(elt)  // Error: '(A) -> $T3' is not identical to 'S.Generator.Element'
        results.append(xformFunc(elt))  // Error: '(A) -> $T5' is not identical to S.Generator.Element'
        
    }
    return results
}