Problem with optional argument in type-bound, character-valued function

[Janus Weil]

>> Thanks for reporting. I can reproduce this behavior with today's
>> trunk. It definitely looks like a bug in gfortran. Do you feel brave
>> enough to open a PR for this in bugzilla? [Or should I do it for you?]
>
> Please do. Thanks for looking into this!

This is now PR43256:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43256

Cheers,
Janus