[Bug fortran/65841] Seg fault on intrinsic assignment to allocatable derived type with allocatable component

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65841

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
I confirm the segfault with my clean trees for all variants (4.8 and 4.9 give
an ICE).

However I don't see them on my patched trees having Mikael's patch for pr65792
(https://gcc.gnu.org/ml/fortran/2015-04/msg00063.html) and Andre's one for
pr59678 (https://gcc.gnu.org/ml/fortran/2015-04/msg00061.html). Note that the
last test in comment 1 segfault with only the [fist patch] for pr65792 + the
one for pr59678.

All the test run without segfault with the cumulated patch for pr61831 and
pr65792 (https://gcc.gnu.org/bugzilla/attachment.cgi?id=35352) + the one for
pr59678.

Note also that repeated assignments is checked by
gfortran.dg/alloc_comp_assign_10.f90 (pr39879):

  u%model = u%design
  u%model = u%design ! The double assignment was the cause of the ICE