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Rollup merge of #156936 - Darksonn:no-PinCoerceUnsized-for-UnsafePinned, r=Mark-Simulacrum
Remove FIXME about impl PinCoerceUnsized for UnsafePinned<T>
The `PinCoerceUnsized` trait may only be implemented for smart pointer types, but `UnsafePinned` has no indirection. Thus, it will not be correct to add this impl.
Follow-up to rust-lang/rust#137043
cc @Sky9x