duplicates:

• SR-893 Compiler fails to infer return type of the transform closure in a map call

Issue Description:

When using ..< to generate the range to map over, the compiler can not resolve ..< when the closure is more complex.

The error is:

error: repl.swift:1:21: error: ambiguous reference to member '..<'
let result = (0 ..< 4).map {
^~~

Swift...<:14:13: note: found this candidate
public func ..<<Bound : Comparable>(minimum: Bound, maximum: Bound) -> Range<Bound>
^

Swift...<:14:13: note: found this candidate
public func ..<<Bound : _Strideable where Bound : Comparable, Bound.Stride : Integer>(minimum: Bound, maximum: Bound) -> CountableRange<Bound>

Code that works:

let result = (0 ..< 4).map {
$0
}

Code that doesn't work:

let result = (0 ..< 4).map {
let temp = $0
return temp
}

and

let result = (0 ..< 4).map { a in
let temp = a
return temp
}