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ed2cbca04f
SILGen introduces a copy of the capture, because the semantics of escaping partial_apply's requires the closure to take ownership of the parameters. We don't know when a closure is strictly nonescaping or its final lifetime until ClosureLifetimeFixup runs, but that replaces the consume of the copy with a borrow of the copy normally, hoping later passes fix it up. We can't wait that long for move-only types, which can't be copied, so try to remove the copy up front when the copy lives long enough and has no interfering uses other than the partial_apply. rdar://110137169
35 lines
558 B
Swift
35 lines
558 B
Swift
// RUN: %target-run-simple-swift
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// REQUIRES: executable_test
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internal func _myPrecondition(
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_ body: @autoclosure () -> Bool
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) {
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guard body() else {
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fatalError("condition failed")
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}
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}
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var deinitCounter = 0
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struct MyCounter<T>: ~Copyable {
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let expectedCount = 1
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let box: T
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init(_ t: T) {
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self.box = t
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}
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deinit {
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print("hello")
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deinitCounter += 1
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_myPrecondition(deinitCounter == self.expectedCount)
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}
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}
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func test() {
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_ = MyCounter(4343)
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}
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// CHECK: hello
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test()
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// CHECK-NEXT: great success
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print("great success")
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