private static @Nullable ExpressionToConstantComparison fromComparison(PsiExpression candidate, PsiExpression left, PsiExpression right) {
      if (left == null || right == null) return null;
      ExpressionToConstantComparison fromLeft = tryExtract(candidate, left, right);
      if (fromLeft != null) return fromLeft;
      return tryExtract(candidate, right, left);
    }
private static @Nullable ExpressionToConstantComparison fromComparison(PsiExpression candidate, PsiExpression left, PsiExpression right)