Fix typos and stderr test output for rustc 1.92.

[slowsage]

Typos workflow was failing for #660. Investigated and found three issues:

• An actual typo in state.rs.
• Exceptions for intended typos in tests.
• transferrable typo in rustc's stderr. Fixed in rustc 1.92.

1.92 should be the default version in github workflows mid december or so. This PR can then be merged (if all else is ok). The stderr format will need to change to this output in any case for 1.92.