Rollup merge of #161329 - jakubadamw:e-needs-test, r=jackh726

Add regression tests for a few fixed issues with E-needs-test

Closes rust-lang/rust#45689.
Closes rust-lang/rust#66805.
Closes rust-lang/rust#82646.
Closes rust-lang/rust#99478.
Closes rust-lang/rust#146398.

LLM disclosure: I used an LLM to identify best candidate issues (labelled as E-needs-test, unclaimed, with sensible reproducible examples etc)

All the tests have been verified to pass in the current nightly and reproduce in the nightlies in which they were reported to fail in/released around the date of the issues’ creation.