[Bug fortran/91471] f951: internal compiler error: gfc_variable_attr(): Bad array reference

[SameeranJayant.Joshi at amd dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91471

--- Comment #2 from Sameeran Joshi <SameeranJayant.Joshi at amd dot com> ---
(In reply to kargl from comment #1)
> I have a patch that prevents the ICE.  Remove ICE-on-valid-code
> tag as the code is invalid.

It fails when a value is assigned to the allocated space:

program dynamic
        implicit none
        integer,dimension(:), allocatable :: x
        allocate(x(1))
        x(1) = 10
        stop x(1)
end program dynamic

Is above ICE-ON-INVALID code ? 
Can you please specify the reason?
Thanks