gcc-4.9/gcc/testsuite/gnat.dg/notnot.adb


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--  { dg-do compile }
--  { dg-options "-gnatwr" }

procedure notnot (x, y : integer) is
begin
   if not (not (x = y)) then  -- { dg-warning "redundant double negation" }
      return;
   end if;
end;