Added diagnostic for pin! macro in addition to Box::pin if Unpin isn't implemented #110259
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I made a PR earlier, but accidentally renamed a branch and that deleted the PR... sorry for the duplicate
Currently, if an operation on
Pin<T>
is performed that requiresT
to implementUnpin
, the diagnostic suggestion is to useBox::pin
("note: consider usingBox::pin
").This PR suggests pin! as well, as that's another valid way of pinning a value, and avoids a heap allocation. Appropriate diagnostic suggestions were included to highlight the difference in semantics (local pinning for pin! vs non-local for Box::pin).
Fixes #109964