| // RUN: %target-swift-frontend -typecheck -verify %s |
| |
| // rdar://problem/29954938 -- A bug in associated type inference exposed an |
| // order dependency where, if a type conformed to Collection in one extension |
| // then conformed to MutableCollection in a later extension, it would fail |
| // to type-check. |
| |
| struct Butz<Flubz: Comparable> { } |
| |
| extension Butz: Collection { |
| public var startIndex: Flubz { fatalError() } |
| public var endIndex: Flubz { fatalError() } |
| } |
| |
| extension Butz: MutableCollection { |
| public subscript (_ position: Flubz) -> Flubz { |
| get { fatalError() } |
| set { } |
| } |
| public func index(after i: Flubz) -> Flubz { fatalError() } |
| } |
