mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
687624e317
When gathering constraints for a type variable, we were gathering all of the constraints for the members of the equivalence class, and then for the adjacencies of the representative of the equivalence class, but not from the adjacencies of other members of the equivalence class. For example for: #3 = $T3 #4 = $T4 equivalent to $T3 #5 = $T5 as $T4.Element after binding $T3 we would collect the constraints related to $T3 and $T4, but not $T5. The end result can be that we finish examining all disjunctions and type bindings but still have inactive constraints in the constraint graph, which is treated as a failure in the solver. Fixes SR-5120 / rdar://problem/32618740.
39 lines
680 B
Swift
39 lines
680 B
Swift
// RUN: %target-swift-frontend -typecheck %s
|
|
|
|
// SR-5120 / rdar://problem/32618740
|
|
protocol InitCollection: Collection {
|
|
init(_ array: [Iterator.Element])
|
|
}
|
|
|
|
protocol InitAny {
|
|
init()
|
|
}
|
|
|
|
extension Array: InitCollection {
|
|
init(_ array: [Iterator.Element]) {
|
|
self = array
|
|
}
|
|
}
|
|
|
|
extension String: InitAny {
|
|
init() {
|
|
self = "bar"
|
|
}
|
|
}
|
|
|
|
class Foo {
|
|
func foo<T: InitCollection, U: InitAny>(of type: U.Type) -> T
|
|
where T.Iterator.Element == U
|
|
{
|
|
return T.init([U.init()])
|
|
}
|
|
|
|
func foo<T: InitCollection, U: InitAny>(of type: U.Type) -> T?
|
|
where T.Iterator.Element == U
|
|
{
|
|
return T.init([U.init()])
|
|
}
|
|
}
|
|
|
|
let _: [String] = Foo().foo(of: String.self)
|