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Commit 8b7088a

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Rollup merge of #139097 - m-ou-se:pin-tests, r=WaffleLapkin
Add more tests for pin!(). This adds the tests suggested by `@danielhenrymantilla` in this comment: #138717 (comment) by
2 parents 12165fc + 163ea4a commit 8b7088a

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‎library/coretests/tests/pin_macro.rs‎

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@@ -47,3 +47,14 @@ fn temp_lifetime() {
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}
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async fn foo(_: &mut usize) {}
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}
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#[test]
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fn transitive_extension() {
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async fn temporary() {}
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// `pin!` witnessed in the wild being used like this, even if it yields
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// a `Pin<&mut &mut impl Unpin>`; it does work because `pin!`
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// happens to transitively extend the lifespan of `temporary()`.
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let p = pin!(&mut temporary());
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let _use = p;
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}

‎tests/ui/pin-macro/pin_move.rs‎

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//@ edition:2024
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use core::marker::PhantomPinned;
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use core::pin::pin;
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fn a() {
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struct NotCopy<T>(T);
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#[allow(unused_mut)]
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let mut pointee = NotCopy(PhantomPinned);
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pin!(pointee);
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let _moved = pointee;
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//~^ ERROR use of moved value
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}
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fn b() {
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struct NotCopy<T>(T);
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let mut pointee = NotCopy(PhantomPinned);
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pin!(*&mut pointee);
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//~^ ERROR cannot move
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let _moved = pointee;
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}
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fn main() {
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a();
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b();
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}

‎tests/ui/pin-macro/pin_move.stderr‎

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error[E0382]: use of moved value: `pointee`
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--> $DIR/pin_move.rs:11:18
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|
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LL | let mut pointee = NotCopy(PhantomPinned);
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| ----------- move occurs because `pointee` has type `a::NotCopy<PhantomPinned>`, which does not implement the `Copy` trait
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LL | pin!(pointee);
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| ------- value moved here
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LL | let _moved = pointee;
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| ^^^^^^^ value used here after move
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|
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note: if `a::NotCopy<PhantomPinned>` implemented `Clone`, you could clone the value
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--> $DIR/pin_move.rs:7:5
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|
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LL | struct NotCopy<T>(T);
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| ^^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
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...
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LL | pin!(pointee);
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| ------- you could clone this value
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error[E0507]: cannot move out of a mutable reference
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--> $DIR/pin_move.rs:18:10
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|
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LL | pin!(*&mut pointee);
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| ^^^^^^^^^^^^^ move occurs because value has type `b::NotCopy<PhantomPinned>`, which does not implement the `Copy` trait
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|
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note: if `b::NotCopy<PhantomPinned>` implemented `Clone`, you could clone the value
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--> $DIR/pin_move.rs:16:5
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|
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LL | struct NotCopy<T>(T);
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| ^^^^^^^^^^^^^^^^^ consider implementing `Clone` for this type
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LL | let mut pointee = NotCopy(PhantomPinned);
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LL | pin!(*&mut pointee);
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| ------------- you could clone this value
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0382, E0507.
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For more information about an error, try `rustc --explain E0382`.

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