[Bug fortran/78640] [F2015] gfortran accepts invalid allocatable polymorphic result in pure function

[damian at sourceryinstitute dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78640

--- Comment #2 from Damian Rouson <damian at sourceryinstitute dot org> ---
I think this bug just bit gfortran user and Fortran enthusiast Stefano Zhagi.
Is anyone interested in fixing it?