compiletest "not found errors" output is badly formatted

[RalfJung]

When compiletest encounters "not found errors", its output now looks like this:

--- not found errors (from test file) ---
ERRORline  11: it is undefined behavior to use this value
NOTEline  11: reference to mutable memory
---

That looks glitched out, with the lack of a space before "line". I think the line number should probably come first anyway, before the diagnostic kind.

I think this is a regression, this used to look just fine.

The formatting seems to happen here:

rust/src/tools/compiletest/src/errors.rs

Line 80 in 56d6b4e

format!("{: <10}line {: >3}: {}", self.kind, self.line_num_str(), self.msg.cyan())

Cc @petrochenkov

[petrochenkov]

This is fixed in #140622.
You may also be interested in looking at other changes in that PR.