Auto merge of #50003 - kennytm:rollup, r=kennytm

Rollup of 8 pull requests

Successful merges:

 - #49555 (Inline most of the code paths for conversions with boxed slices)
 - #49606 (Prevent broken pipes causing ICEs)
 - #49646 (Use box syntax instead of Box::new in Mutex::remutex on Windows)
 - #49647 (Remove `underscore_lifetimes` and `match_default_bindings` from active feature list)
 - #49931 (Fix incorrect span in `&mut` suggestion)
 - #49959 (rustbuild: allow building tools with debuginfo)
 - #49965 (Remove warning about f64->f32 cast being potential UB)
 - #49994 (Remove unnecessary indentation in rustdoc book codeblock.)

Failed merges: