Good catch. Seems like an issue with the diagnostic. Can you file a bug at
bugs.swift.org?
Jordan
> On Apr 18, 2016, at 13:45, David Sweeris via swift-dev <swift-dev@swift.org>
> wrote:
>
> I was updating some old code to Swift 2.2, and came across an unexpected
> tuple splat warning. This code is all you need to generate the deprecation
> warning:
> public class Value<T> {
> public typealias Element = T
> public typealias Ret = T
> }
> public class Expression<A, R> : Value<R> {
> public typealias Arg = A
> public var args: Arg! = nil
> public subscript(arg: Arg) -> Value<Ret> { return self }
> }
> public class Op<A, R> : Expression<A, R> {
> public typealias OpType = Arg -> Value<R>
> public let op: OpType
> init(op: OpType) {
> self.op = op
> super.init()
> }
> }
> public class BinaryOp<A1, A2, R> : Op<(A1, A2), R> {
> override init(op: OpType) {
> super.init(op: op)
> }
> override public subscript(x: Arg) -> Value<Ret> {
> return op(x) //Warning: Passing 2 arguments to a callee as a single
> tuple value is deprecated
> }
> }
>
> I don’t understand why the compiler thinks I’m trying to splat the tuple…
> `op` takes one argument of type `Arg` and I’m giving it one argument of type
> `Arg`. In the case of a `BinaryOp`, `Arg` does happen to be a tuple, but the
> proposal
> (https://github.com/apple/swift-evolution/blob/master/proposals/0029-remove-implicit-tuple-splat.md
>
> <https://github.com/apple/swift-evolution/blob/master/proposals/0029-remove-implicit-tuple-splat.md>)
> specifically says "it does not propose removing the ability to pass tuples
> as values to functions”.
>
> Am I missing something, or have I found a bug in Swift 2.2?
>
> - Dave Sweeris
>
> (PS, Sorry if this is the wrong list… I’m not sure where potential bug
> reports go.)
> _______________________________________________
> swift-dev mailing list
> swift-dev@swift.org
> https://lists.swift.org/mailman/listinfo/swift-dev
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