[Bug fortran/79864] Implicit type conversion on assignment of unallocated array to unallocated array variable segfaults.

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79864

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Note, there is a small difference to pr78963

Should be 79863.

Compiling the test with '-Wall -Wextra -fcheck=all -Ofast -m32
-fsanitize=address' gives

pr79864.f90:4:0:

   si = ssi

Warning: 'ssi.dim[0].ubound' may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr79864.f90:2:0:

   integer(kind=1), allocatable :: ssi(:)

note: 'ssi.dim[0].ubound' was declared here
pr79864.f90:4:0:

   si = ssi

Warning: 'ssi.dim[0].lbound' may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr79864.f90:2:0:

   integer(kind=1), allocatable :: ssi(:)

note: 'ssi.dim[0].lbound' was declared here
pr79864.f90:4:0:

   si = ssi

Warning: 'si.dim[0].ubound' may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr79864.f90:1:0:

   integer, allocatable :: si(:)

note: 'si.dim[0].ubound' was declared here
pr79864.f90:4:0:

   si = ssi

Warning: 'si.dim[0].lbound' may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr79864.f90:1:0:

   integer, allocatable :: si(:)

note: 'si.dim[0].lbound' was declared here

unless the patch in pr52162 comment 8 is applied.

Note that I don't see any segfault at run time.