`rustc --ls` gives 'could not find metadata' error for missing file

[huonw]

$ mkdir empty && cd empty
$ ls -a
.  ..
$ rustc --ls foo
could not find metadata in foo.

"No such file" would be nicer.

[metajack]

Still happens. Seems like just a bug, so not nominating.

[thestinger]

This is still an issue.