Auto merge of #90203 - matthiaskrgr:rollup-v215wew, r=matthiaskrgr

Auto merge of #90203 - matthiaskrgr:rollup-v215wew, r=matthiaskrgr

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