Note that while gofmt (and Go) has strong opinions on a lot of things, there is no hard rule about line length in the Go community as far as I’m aware. I’m an 80 column zealot, so I’ve always written Go in 80 columns and I use gofmt with no problems. I don’t see any reason why rustfmt couldn’t take a similarly unopinionated position.
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I think it would be trivial to force rustfmt to never exceed 80 columns if it didn’t have more than 80 before reformatting. Making it take less than 80 if you have more than 80 should be a no-no since it could be that the programmer wants to be bounded by 100.
Yes. This is exactly what I’m hoping will happen. 
I'm already aware that many people disagree with my style. You're also excluding everybody in the "fight" that comes to Rust after rustfmt is done.
If the above is true, where is the problem with a per-project configuration file? For you, there wouldn't even be more work. For your new projects, rustfmt could just use the default style guide settings. For others' projects with customizations, rustfmt will pick up the configuration by itself and you invoke it no different.
I still find it's a good compromise.
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