gcc/testsuite/algol68/compile/error-module-ranges-1.a68

{ Definitions in the def-part of a module text are visible in the
  postlude-part, but not the other way around.  }

module Foo = def int i;
                 x := 20 { dg-error "" }
             postlude
                 i := 10 { this is ok }
             fed