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c508ef56ac
We would only check conditioanlavailability once we had committed to a best witness. Instead, let's use this information to disambiguate among multiple best witnesses, if we have them. Access control and unconditional unavailability are still only checked once the witness is chosen. Fixes rdar://problem/77259046.
43 lines
1.6 KiB
Swift
43 lines
1.6 KiB
Swift
// RUN: %target-swift-frontend -emit-sil -verify %s | %FileCheck %s
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// REQUIRES: OS=macosx
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public protocol Potato {
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func eat()
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}
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public protocol Fried {}
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extension Potato {
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public func eat() {}
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}
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@available(macOS 100, *)
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extension Potato where Self : Fried {
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public func eat() {}
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}
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// We ought to pick the unconstrained Potato.eat(), not
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// the one from the extension, because the extension has
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// narrower availability than the conformance.
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public struct CurlyFries : Potato, Fried {}
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public struct TaterTots {}
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// This conformance on the other hand should use the
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// constrained Potato.eat(), since the generic signature
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// is more specific than the unconstrained protocol
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// extension.
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@available(macOS 100, *)
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extension TaterTots : Potato, Fried {}
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// We FileCheck the SILGen output to verify that the correct
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// witnesses were chosen above.
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// CHECK-LABEL: sil shared [transparent] [thunk] @$s37conformance_availability_disambiguate10CurlyFriesVAA6PotatoA2aDP3eatyyFTW : $@convention(witness_method: Potato) (@in_guaranteed CurlyFries) -> () {
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// CHECK: function_ref @$s37conformance_availability_disambiguate6PotatoPAAE3eatyyF : $@convention(method) <τ_0_0 where τ_0_0 : Potato> (@in_guaranteed τ_0_0) -> ()
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// CHECK: return
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// sil shared [transparent] [thunk] @$s37conformance_availability_disambiguate9TaterTotsVAA6PotatoA2aDP3eatyyFTW : $@convention(witness_method: Potato) (@in_guaranteed TaterTots) -> () {
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// CHECK: function_ref @$s37conformance_availability_disambiguate6PotatoPA2A5FriedRzrlE3eatyyF : $@convention(method) <τ_0_0 where τ_0_0 : Fried, τ_0_0 : Potato> (@in_guaranteed τ_0_0) -> ()
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// CHECK: return |