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Reference to `makeIterator` in for-in loop context needs to be treated as a reference to a witness of `Sequence#makeIterator` requirement, otherwise it could lead to problems with retroactive conformances.
37 lines
1.1 KiB
Swift
37 lines
1.1 KiB
Swift
// RUN: %target-swift-frontend -emit-silgen %s | %FileCheck %s
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// https://github.com/apple/swift/issues/60958
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// Make sure that `makeIterator` witness is picked over the non-witness.
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struct S: Sequence {
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private var _storage: [UInt8] = []
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func makeIterator() -> Array<UInt8>.Iterator {
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_storage.makeIterator()
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}
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typealias Element = UInt8
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class Iterator: IteratorProtocol {
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func next() -> UInt8? { 0 }
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typealias Element = UInt8
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}
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func makeIterator() -> Iterator {
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Iterator()
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}
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}
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extension S {
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// CHECK: sil hidden [ossa] @$s4main1SV1fyyF
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func f() {
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for elt in self {
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// CHECK: [[ITERATOR_VAR:%.*]] = project_box {{.*}} : ${ var S.Iterator }, 0
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// CHECK: [[MAKE_ITERATOR_REF:%.*]] = function_ref @$s4main1SV12makeIteratorAC0C0CyF : $@convention(method) (@guaranteed S) -> @owned S.Iterator
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// CHECK-NEXT: [[ITERATOR:%.*]] = apply [[MAKE_ITERATOR_REF]](%0) : $@convention(method) (@guaranteed S) -> @owned S.Iterator
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// CHECK-NEXT: store [[ITERATOR]] to [init] [[ITERATOR_VAR]] : $*S.Iterator
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print(elt)
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}
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}
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}
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