Warn on extraneous, unnecessary semicolons

[frewsxcv]

fn main() {
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    println!("Hello, world!");
}

[Manishearth]

I'm not sure how to do this, ast-json on that code gives nothing checkable (the semicolons are parsed out?)

There are still ways of doing this though.

[llogiq]

We'd need to look at the actual code (via snippet) if available.

[sanmai-NL]

Can we close this and approach this as a rustfmt concern instead?

[oli-obk]

Yea I agree, this should be solved by rustfmt