1! { dg-do run }
2! { dg-skip-if "" { *-*-* } { "-O0" } { "" } }
3! { dg-additional-options "-ffrontend-optimize -floop-nest-optimize" }
4! PR 56872 - wrong front-end optimization with a single constructor.
5! Original bug report by Rich Townsend.
6  integer :: k
7  real :: s
8  integer :: m
9  s = 2.0
10  m = 4
11  res = SUM([(s**(REAL(k-1)/REAL(m-1)),k=1,m)])
12  if (abs(res - 5.84732246) > 1e-6) STOP 1
13  end
14