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07a69c425f
Since opening closure body is now delayed until contextual type becomes available it's possible to infer anonymous parameters as being variadic based on context and propagate that information down to the closure body. Resolves: rdar://problem/41416758
40 lines
1.2 KiB
Swift
40 lines
1.2 KiB
Swift
// RUN: %target-typecheck-verify-swift
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func takeIntToInt(_ f: (Int) -> Int) { }
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func takeIntIntToInt(_ f: (Int, Int) -> Int) { }
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// Simple closures with anonymous arguments
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func simple() {
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takeIntToInt({return $0 + 1})
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takeIntIntToInt({return $0 + $1 + 1})
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}
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func takesIntArray(_: [Int]) { }
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func takesVariadicInt(_: (Int...) -> ()) { }
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func takesVariadicIntInt(_: (Int, Int...) -> ()) { }
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func takesVariadicGeneric<T>(_ f: (T...) -> ()) { } // expected-note {{in call to function 'takesVariadicGeneric'}}
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func variadic() {
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// These work
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takesVariadicInt({let _ = $0})
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takesVariadicInt({let _: [Int] = $0})
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let _: (Int...) -> () = {let _: [Int] = $0}
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takesVariadicInt({takesIntArray($0)})
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let _: (Int...) -> () = {takesIntArray($0)}
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takesVariadicGeneric({takesIntArray($0)})
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// FIXME: Problem here is related to multi-statement closure body not being type-checked together with
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// enclosing context. We could have inferred `$0` to be `[Int]` if `let` was a part of constraint system.
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takesVariadicGeneric({let _: [Int] = $0})
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// expected-error@-1 {{generic parameter 'T' could not be inferred}}
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takesVariadicIntInt({_ = $0; takesIntArray($1)})
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takesVariadicIntInt({_ = $0; let _: [Int] = $1})
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}
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