[Bug fortran/59198] [4.7/4.8/4.9 Regression] ICE on cyclically dependent polymorphic types

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59198

--- Comment #7 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Paul Thomas from comment #6)
>         if (src->rng._data != 0B)
>           {
>             dst->rng._data = (struct rng_t *) __builtin_malloc ((unsigned
> long) src->rng._vptr->_size);
>             src->rng._vptr->_copy (src->rng._data, dst->rng._data);
>           }

Could this be caused by a NULL pointer? Namely,

Malloc returns: "If size is 0, either a null pointer or a unique  pointer  that
 can  be successfully passed to free() shall be returned."