compiletest output newlines are weird

[matthiaskrgr]

acabb52

[matthiaskrgr]

#133817 seems suspicious cc @clubby789 @jieyouxu

[fmease]

Likely missed to replace print!(…)s with eprint!(…) (having replaced println!(…)s with eprintln!(…)).

[clubby789]

Ah good point. Will make a followup

[jieyouxu]

Revert PR: #133892