https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85544
--- Comment #1 from G. Steinmetz <gs...@t-online.de> ---
Whereas this variant (plain b) works for all tested versions :
$ cat z4.f90
program p
integer, parameter :: na = -3, ne = 10
integer :: i, a(na:ne), b(na:ne), c(na:ne)
a = [(i, i=na, ne)]
b = 2**a
c = [(2**i, i=na, ne)]
print *, sum(abs(b-c))
end
$ gfortran-8-20180422 z4.f90 -O2 -static-libgfortran
$ a.out
0
$
