ProgrammingLanguageNr1.Parser.checkLeftHandSide C# (CSharp) Method

        void checkLeftHandSide(AST lhs, Token operatorToken)
        {
            if(lhs == null) {
                throw new Error("No expression on the left side of '" + operatorToken.getTokenString() + "'",
                    Error.ErrorType.SYNTAX, operatorToken.LineNr, operatorToken.LinePosition - 1);
            }
        }