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
$

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