Rollup of 5 pull requests
Successful merges:
- #85833 (Scrape code examples from examples/ directory for Rustdoc)
- #88041 (Make all proc-macro back-compat lints deny-by-default)
- #89829 (Consider types appearing in const expressions to be invariant)
- #90168 (Reset qualifs when a storage of a local ends)
- #90198 (Add caveat about changing parallelism and function call overhead)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
91b931926f