Consider increasing single_line_if_else_max_width

[nivekuil]

The default 50 column limit on single-line if-else statements feels like it creates too much whitespace for simple logic. For example:

let dest: PathBuf = {
    let grave = graveyard.join(path.strip_prefix("/").unwrap());
    if grave.exists() { rename_grave(grave) } else { grave }
};

becomes

let dest: PathBuf = {
    let grave = graveyard.join(path.strip_prefix("/").unwrap());
    if grave.exists() {
        rename_grave(grave)
    } else {
        grave
    }
};

I understand the rationale behind discouraging complex one-liners, but it seems like a length restriction just encourages shorter variable names.

[nrc]

Yeah, I mostly agree and also get frustrated when we don't quite hit the length limit. However, rather than just extend the limit, I'd rather do something a little smarter, like look at the expressions in the arms (I think we already require a single expression) and allow a one-liner if there is a 'small' expression, for some definition of that.

[nrc]

Discussed at rust-lang/style-team#47