[Bug fortran/78737] [OOP] linking error with deferred, undefined user-defined derived-type I/O

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78737

--- Comment #10 from janus at gcc dot gnu.org ---
(In reply to Paul Thomas from comment #9)
> Created attachment 40302 [details]
> A workaround for the PR (even a patch?)
> 
> The attached allows this testcase to run as intended:

True, your patch makes gfortran accept the test case in comment #9 (probably
correctly), but AFAICS it does not fix the link-time error on comment 0 or 6.