Auto merge of #44932 - cuviper:unsized-ptr-is_null, r=alexcrichton

Remove `T: Sized` on pointer `as_ref()` and `as_mut()`

`NonZero::is_zero()` was already casting all pointers to thin `*mut u8` to check for null.  The same test on unsized fat pointers can also be used with `as_ref()` and `as_mut()` to get fat references.

(This PR formerly changed `is_null()` too, but checking just the data pointer is not obviously correct for trait objects, especially if `*const self` sorts of methods are ever allowed.)

0 files changed, 0 insertions, 0 deletions