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Surprisingly, there are some situations where an extension can end up with _fewer_ constraints than the extended type. That was baked-in as an assertion in this new-ish method. I haven't figured out why that can happen in the reproducer only when using `-interpret` mode. It didn't trigger the assertion for me when compiling normally. The fix is simple: check all the requirements, rather than using a short-cut. resolves rdar://125659789 / https://github.com/apple/swift/issues/72719
18 lines
404 B
Swift
18 lines
404 B
Swift
// RUN: %target-swift-frontend -interpret %s
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// REQUIRES: executable_test
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// This only reproduced if you provide the -interpret flag!
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// https://github.com/apple/swift/issues/72719
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protocol D {}
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struct U: D, Equatable {}
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class Q<T> {}
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class R<V, E: D & Equatable> {}
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extension R where E == U {
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struct S<X> {}
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static func a<T>(_: T) -> R {
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let x = Q<S<T>>()
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fatalError()
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}
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}
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