Box::leak: tell people to avoid unleaking - #160323

Box::leak: tell people to avoid unleaking

r? @nia-e
Cc @rust-lang/opsem

Note that this goes against the advice given by clippy in rust-lang/rust-clippy#17336. I think clippy should be adjusted to recommend `Box::into_non_null` instead. @ArhanChaudhary wold be great if you could make a clippy PR for that. :)

…uwer

Rollup of 10 pull requests

Successful merges:

 - #157572 (stabilize size_of_val_raw, align_of_val_raw, Layout::for_value_raw)
 - #160012 (miri: ensure validity of references and pointers we dereference and cast)
 - #160294 (Update Enzyme to resolve one of the open bugs)
 - #159503 (allocations: document that they can be read-only)
 - #160250 (When issuing suggestions for missing trait items, label unstable items)
 - #160251 (Replace unsafe usage of `NonNull::new_unchecked` with `Box::into_non_null`)
 - #160311 (Remove final use of sealed traits from stdlib)
 - #160313 (Make the noundef-on-Cast size guard explicit)
 - #160323 (Box::leak: tell people to avoid unleaking)
 - #160328 (Move `check_track_caller` into the attribute parser)

…uwer

Rollup of 12 pull requests

Successful merges:

 - #157572 (stabilize size_of_val_raw, align_of_val_raw, Layout::for_value_raw)
 - #160012 (miri: ensure validity of references and pointers we dereference and cast)
 - #160294 (Update Enzyme to resolve one of the open bugs)
 - #159503 (allocations: document that they can be read-only)
 - #160179 (std: Update `wasip3` crate dependency)
 - #160250 (When issuing suggestions for missing trait items, label unstable items)
 - #160251 (Replace unsafe usage of `NonNull::new_unchecked` with `Box::into_non_null`)
 - #160311 (Remove final use of sealed traits from stdlib)
 - #160313 (Make the noundef-on-Cast size guard explicit)
 - #160323 (Box::leak: tell people to avoid unleaking)
 - #160328 (Move `check_track_caller` into the attribute parser)
 - #160333 (Remove itertools dependency from `rustc_ast_pretty`)

…uwer

Rollup of 12 pull requests

Successful merges:

 - rust-lang/rust#157572 (stabilize size_of_val_raw, align_of_val_raw, Layout::for_value_raw)
 - rust-lang/rust#160012 (miri: ensure validity of references and pointers we dereference and cast)
 - rust-lang/rust#160294 (Update Enzyme to resolve one of the open bugs)
 - rust-lang/rust#159503 (allocations: document that they can be read-only)
 - rust-lang/rust#160179 (std: Update `wasip3` crate dependency)
 - rust-lang/rust#160250 (When issuing suggestions for missing trait items, label unstable items)
 - rust-lang/rust#160251 (Replace unsafe usage of `NonNull::new_unchecked` with `Box::into_non_null`)
 - rust-lang/rust#160311 (Remove final use of sealed traits from stdlib)
 - rust-lang/rust#160313 (Make the noundef-on-Cast size guard explicit)
 - rust-lang/rust#160323 (Box::leak: tell people to avoid unleaking)
 - rust-lang/rust#160328 (Move `check_track_caller` into the attribute parser)
 - rust-lang/rust#160333 (Remove itertools dependency from `rustc_ast_pretty`)

…uwer

Rollup of 12 pull requests

Successful merges:

 - rust-lang/rust#157572 (stabilize size_of_val_raw, align_of_val_raw, Layout::for_value_raw)
 - rust-lang/rust#160012 (miri: ensure validity of references and pointers we dereference and cast)
 - rust-lang/rust#160294 (Update Enzyme to resolve one of the open bugs)
 - rust-lang/rust#159503 (allocations: document that they can be read-only)
 - rust-lang/rust#160179 (std: Update `wasip3` crate dependency)
 - rust-lang/rust#160250 (When issuing suggestions for missing trait items, label unstable items)
 - rust-lang/rust#160251 (Replace unsafe usage of `NonNull::new_unchecked` with `Box::into_non_null`)
 - rust-lang/rust#160311 (Remove final use of sealed traits from stdlib)
 - rust-lang/rust#160313 (Make the noundef-on-Cast size guard explicit)
 - rust-lang/rust#160323 (Box::leak: tell people to avoid unleaking)
 - rust-lang/rust#160328 (Move `check_track_caller` into the attribute parser)
 - rust-lang/rust#160333 (Remove itertools dependency from `rustc_ast_pretty`)