[Bug fortran/68224] ICE on referencing parameter array with dimension null

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68224

--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fortran@t-online.de> ---
Detected when assignment is separated from declaration :

$ cat z6.f90
program p
   integer, parameter :: c(null()) = [1, 2]
   integer :: a, b
   a = c(1)
   b = c(2)
end

$ gfortran -g -O0 -Wall -fcheck=all z6.f90
z6.f90:2:27:

    integer, parameter :: c(null()) = [1, 2]
                           1
Error: Expression at (1) must be of INTEGER type, found UNKNOWN
z6.f90:2:34:

    integer, parameter :: c(null()) = [1, 2]
                                  1
Error: Parameter array 'c' at (1) cannot be automatic or of deferred shape