Rollup of 7 pull requests#102097

Merged

bors merged 15 commits intorust-lang:masterfrom

Dylan-DPC:rollup-gc75oh4

Sep 21, 2022

Commits on Aug 26, 2022

`alloc`: add unstable cfg features `no_rc` and `no_sync`
ojeda
committed

Commits on Sep 18, 2022

Add another example for `uN::carrying_mul`
scottmcm
committed

Commits on Sep 19, 2022

Adding ignore fuchsia tests for Backtrace, ErrorKind cases
andrewpollack
committed

Commits on Sep 21, 2022

Overhaul `-Zmeta-stats` output.
nnethercote
committed
Rollup merge of #89891 - ojeda:modular-alloc, r=Mark-Simulacrum
Dylan-DPC
authored
Rollup merge of #101995 - scottmcm:carrying-mul-example, r=Mark-Simulacrum
Dylan-DPC
authored
Rollup merge of #102031 - andrewpollack:compiler-tests-backtrace, r=tmandry
Dylan-DPC
authored
Rollup merge of #102041 - nnethercote:improve-meta-stats, r=bjorn3
Dylan-DPC
authored
Rollup merge of #102045 - RalfJung:const-prop-regression-fix, r=oli-obk
Dylan-DPC
authored
Rollup merge of #102058 - mqudsi:path_extension_docs, r=thomcc
Dylan-DPC
authored
Rollup merge of #102059 - compiler-errors:issue-101984, r=jackh726
Dylan-DPC
authored