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+!==================initialization_1.f90======================
+
+! { dg-do compile }
+! Tests fix for PR25018 in which an ICE resulted from using a
+! variable in a parameter initialization expression. In the course
+! of developing the fix, various other constraints and limitations
+! were tested.
+!
+! Contributed by Paul Thomas  <pault@gcc.gnu.org>
+!
+module const
+! The next line is the original error
+  real(8), parameter :: g = - sqrt(2._8) * Gf ! { dg-error "not been declared or is a variable" }
+contains
+  subroutine foo(ch1, x, y)
+    character(*)        :: ch1
+
+! This is OK because it is a restricted expression.
+    character(len(ch1)) :: ch2
+
+    real(8) :: x (1:2, *)
+    real(8) :: y (0:,:)
+    integer :: i
+    real :: z(2, 2)
+
+! However, this gives a warning because it is an initialization expression.
+    integer :: l1 = len (ch1)     ! { dg-error "Assumed or deferred character length variable" }
+
+! These are warnings because they are gfortran extensions.
+    integer :: m3 = size (x, 1)   ! { dg-error "Assumed size array" }
+    integer :: m4(2) = shape (z)
+
+! This does not depend on non-constant properties.
+    real(8) :: big = huge (x)
+
+  end subroutine foo  
+end module const
+
+! { dg-final { cleanup-modules "const" } }