Diagnostic doesn't align properly in span where line number increases by one digit

[ktt3ja]

For example, in this case there should be two spaces between 8 and fn instead of one.

test2.rs:8:1: 12:2 warning: code is never used: `foo`, #[warn(dead_code)] on by default
test2.rs:8 fn foo() {
test2.rs:9 
test2.rs:10 
test2.rs:11 
test2.rs:12 }

[steveklabnik]

This still happens. Here's a full test case with proper whitespace:

fn main() {




}

fn foo() {


}

[tbelaire]

I'm going to poke around with this.

[tbelaire]

How would you actually get a test to look for this, since compile-fail doesn't seem quite right.

Also, what happens if #3533 goes through? That'll require undoing these changes...