mangle does mangle quite aggressively.

Fairly straight forward bindings.

Just exports &errno.

• hardcodes ansi terminal sequences, though not an issue in practice

Fairly simple, generic core with tiny definitions for the cases, well tested.

Pretty straight forward parsers, with thorough testing.

Never seen so many warn(..) options.
Seems straight forward enough, pretty much what I expected.

I'm not too familiar with the Windows stuff.

Fairly simple wrapper around the Logos implementation generated by logos-derive.

Simple macros, well tested.

Spent most time on the "featureless" implementation.

It's just traits.

• hardcodes ansi escape sequences, though not an issue in practice

Relatively straight forward parsing of rustc --version, with pretty good tests.