Beginning-of-line detection in pretty-printer isn't reliable

[marijnh]

It only recognizes 'hard' line breaks. Spaces might also cause lines to be broken. This program ends up with an extra blank line above the comment because of this:

fn main() {
    let x = Foo {x: 10, y: 10000000000,
             // This a comment
             z: 45000000000000000,
             q: 2444444444444444};
}

[emberian]

Still reproducible.

[pnkfelix]

linking to the metabug #3195 so that this ticket gets an entry (with status) in its comments area.

[huonw]

Updated example, still reproduces.

[brson]

Nobody is ever going to fix the current pretty-printer. Closing.