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e6f1691122
Some notes: 1. I implemented this as a contextual keyword that can only apply directly to lvalues. This ensures that we can still call functions called copy, define variables named copy, etc. I added tests for both the c++ and swift-syntax based parsers to validate this. So there shouldn't be any source breaks. 2. I did a little bit of type checker work to ensure that we do not treat copy_expr's result as an lvalue. Otherwise, one could call mutating functions on it or assign to it, which we do not want since the result of copy_value is 3. As expected, by creating a specific expr, I was able to have much greater control of the SILGen codegen and thus eliminate extraneous copies and other weirdness than if we used a function and had to go through SILGenApply. rdar://101862423
12 lines
278 B
Swift
12 lines
278 B
Swift
// RUN: %target-typecheck-verify-swift -disable-availability-checking -enable-experimental-feature NoImplicitCopy
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class Klass {}
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func consumeKlass(_ x: __owned Klass) {}
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func testNoImplicitCopyWorks() {
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@_noImplicitCopy let x = Klass()
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let _ = copy x
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consumeKlass(x)
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}
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