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c0312b9c0e
`TypeVariableOptions` rather than using a separate data structure in the constraint system.
20 lines
712 B
Swift
20 lines
712 B
Swift
// RUN: %target-typecheck-verify-swift
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typealias Not<A> = (A) -> Never
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typealias And<A, B> = (left: A, right: B)
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indirect enum Or<A, B> {
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case inl(A)
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case inr(B)
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}
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func deMorgan<A, B>(_ ne: Not<Or<A, B>>) -> And<Not<A>, Not<B>> {
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// FIXME(diagnostics): The error message about initialization here is confusing
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return And<Not<A>, Not<B>>(
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Not<A> { a in ne(.left(a)) }, // expected-error {{type 'Not<A>' (aka '(A) -> Never') has no member 'init'}}
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// expected-error@-1 {{type 'Or<A, B>' has no member 'left'}}
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Not<B> { a in ne(.right(a)) } // expected-error {{type 'Not<B>' (aka '(B) -> Never') has no member 'init'}}
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// expected-error@-1 {{type 'Or<A, B>' has no member 'right'}}
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)
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}
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