I would like to rename this option and/or change it so that it won't take a major version number as its value.

As I understand it the motivation for having a version field is stability with respect to the formatting output. If my understanding is correct, then relative values such as nightly and current defeat the point.

Now the problem: every user whose rustfmt.toml contains version needs to update their file to keep the behavior of rustfmt as what they expecet.

The following RFC intends to solve the question of how rustfmt can improve the (default) formatting output rust-lang/rfcs#3338 by allowing the default formatting output to change between editions. The idea being that when you change editions, you might already want to go through the source code of the crate that is changing editions to make use of any new language features that have been introduced or eliminate the use of deprecated features. That might also be a good time to reformat the code.

[unstable option] version #3383

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scampiopenedon Feb 13, 2019

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scampi
openedon Feb 13, 2019