Do not reformat on input error

[dhardy]

Could rustfmt not reformat on error, but with command-line option to override, please?

Rationale: I enter some invalid code (e.g. #![rustfmt::max_width(120)], which is not a valid rustfmt attribute), run cargo fmt, and get an error. Because rustfmt still changed the file in question I lose my editor's history (unless overriding its desire to reload a changed file), thus adjusting the invalid item becomes harder.

(BTW, is per-file/item configuration a thing? It would be nice sometimes.)

[calebcartwright]

(BTW, is per-file/item configuration a thing? It would be nice sometimes.)

AFAIK, inline config settings/overrides are not supported though that sounds like it could be a useful feature!

It's not per-file, but you can have multiple rustfmt config files though for different mods/directories if you want different settings for different files.