static boolean sameExpression(RangeConstraint left, RangeConstraint right) {
      return left != null && right != null && left.myField == right.myField &&
             EquivalenceChecker.getCanonicalPsiEquivalence().expressionsAreEquivalent(left.myExpression, right.myExpression);
    }
static boolean sameExpression(RangeConstraint left, RangeConstraint right)