More exception classes into Phobos?

[Andrei Alexandrescu via Digitalmars-d]

On 3/25/17 3:44 PM, Jacob Carlborg wrote:
> Take this error message, using std.file.copy:
>
> std.file.FileException at d.d(3354): /tmp/bar/foo.txt: Permission denied
>
> It doesn't tell if the failed permission is for the source or for the
> target. If failed to read or failed to write.

Would be great if you submitted a PR to improve this message. -- Andrei