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Set an upper bound on the number of chained lookups we attempt to avoid spinning while trying to recursively apply the same dynamic member lookup to itself. rdar://157288911
22 lines
625 B
Swift
22 lines
625 B
Swift
// RUN: %target-typecheck-verify-swift -dynamic-member-lookup-depth-limit=2
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@dynamicMemberLookup
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struct Lens<T> {
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init() {}
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subscript<U>(dynamicMember kp: KeyPath<T, U>) -> U {
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fatalError()
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}
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}
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struct S {
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var x: Int
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}
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_ = \Lens<S>.x // Fine
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_ = \Lens<Lens<S>>.x // Also fine
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_ = \Lens<Lens<Lens<S>>>.x // expected-error {{could not find member 'x'; exceeded the maximum number of nested dynamic member lookups}}
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_ = Lens<S>().x // Fine
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_ = Lens<Lens<S>>().x // Also fine
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_ = Lens<Lens<Lens<S>>>().x // expected-error {{could not find member 'x'; exceeded the maximum number of nested dynamic member lookups}}
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