Remove incorrect comments in Weak
#142700
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It is currently possible to create a dangling `Weak` to a DST by calling `Weak::new()` for a sized type, then doing an unsized coercion. Therefore, the comments are wrong. These comments were added in <rust-lang#73845>. As far as I can tell, the guarantee in the comment was only previously used in the `as_ptr` method. However, the current implementation of `as_ptr` no longer relies on this guarantee.
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It is currently possible to create a dangling
Weakto a DST by callingWeak::new()for a sized type, then doing an unsized coercion. Therefore, the comments are wrong.These comments were added in #73845. As far as I can tell, the guarantee in the comment was only previously used in the
as_ptrmethod. However, the current implementation ofas_ptrno longer relies on this guarantee.