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30 lines
535 B
Swift
30 lines
535 B
Swift
// RUN: %target-run-simple-swift | %FileCheck %s
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// REQUIRES: executable_test
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protocol P {
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associatedtype T
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func foo(t: inout T)
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}
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struct S: P {
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func foo(t: inout () -> Void) {
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t()
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t = { print("new") }
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}
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}
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func doTheFoo<SomeP: P>(_ p: SomeP, _ value: SomeP.T) -> SomeP.T {
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var mutableValue = value
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p.foo(t: &mutableValue)
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return mutableValue
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}
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print("START")
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let newClosure = doTheFoo(S(), { print("old") })
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newClosure()
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print("DONE")
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// CHECK: START
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// CHECK-NEXT: old
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// CHECK-NEXT: new
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// CHECK-NEXT: DONE
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