private static boolean isBoolean(GrExpression expression) {
      if (expression instanceof GrBinaryExpression binaryExpression) {
        final IElementType sign = binaryExpression.getOperationTokenType();
        return GroovyTokenTypes.mLAND.equals(sign) ||
            GroovyTokenTypes.mLOR.equals(sign);
      } else if (expression instanceof GrUnaryExpression prefixExpression) {
        final IElementType sign = prefixExpression.getOperationTokenType();
        return GroovyTokenTypes.mLNOT.equals(sign);
      } else if (expression instanceof GrParenthesizedExpression parenthesizedExpression) {
        final GrExpression contents = parenthesizedExpression.getOperand();
        return isBoolean(contents);
      }
      return false;
    }
private static boolean isBoolean(GrExpression expression)