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3cbc08cc4e
Fixes assertion failures in SILGen and the optimizer with this
exotic setup:
protocol P {
associatedtype T : Q
}
protocol Q {
func requirement<U : P>(u: U) where U.T == Self
}
Here, we only have a U : P conformance, and not Self : Q,
because Self : Q is available as U.T : Q.
There were three problems here:
- The SIL verifier was too strict in verifying the generic signature.
All that matters is we can get the Self parameter conformance, not
that it's the first requirement, etc.
- GenericSignature::getSubstitutionMap() had a TODO concerning handling
of same-type constraints -- this is the first test-case I've found
that triggered the problem.
- GenericEnvironment::getSubstitutionMap() incorrectly ignored
same-type constraints where one of the two types was a generic
parameter.
Fixes <https://bugs.swift.org/browse/SR-3321>.
38 lines
898 B
Swift
38 lines
898 B
Swift
// RUN: %target-swift-frontend %s -emit-ir
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// RUN: %target-swift-frontend %s -emit-ir -O
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protocol ControllerB {
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associatedtype T: Controller
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}
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protocol Controller {
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associatedtype T
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func shouldSelect<S: ControllerB>(_ a: T, b: S) where S.T == Self
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}
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struct ControllerAImpl {}
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struct ControllerImpl : Controller {
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typealias T = ControllerAImpl
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func shouldSelect<S : ControllerB>(_ a: ControllerAImpl, b: S) where S.T == ControllerImpl {}
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}
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struct ControllerBImpl1 : ControllerB {
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typealias T = ControllerImpl
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}
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struct ControllerBImpl2<C : Controller> : ControllerB {
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typealias T = C
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}
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extension Controller {
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func didSelect<S: ControllerB>(_ a: T, b: S) where S.T == Self {
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shouldSelect(a, b: b)
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}
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}
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ControllerImpl().didSelect(ControllerAImpl(), b: ControllerBImpl1())
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ControllerImpl().didSelect(ControllerAImpl(), b: ControllerBImpl2<ControllerImpl>())
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