Method _makeExpressionOrTuple

server/src/parser/parser.ts:1240–1256

(exprListResult: ExpressionListResult)

    }

    private _makeExpressionOrTuple(exprListResult: ExpressionListResult): ExpressionNode {
        if (exprListResult.list.length === 1 && !exprListResult.trailingComma) {
            return exprListResult.list[0];
        }

        // To accommodate empty tuples ("()"), we will reach back to get
        // the opening parenthesis as the opening token.

        let tupleStartRange: TextRange = exprListResult.list.length > 0 ?
            exprListResult.list[0] : this._peekToken(-1);

        let tupleNode = new TupleExpressionNode(tupleStartRange);
        tupleNode.expressions = exprListResult.list;
        tupleNode.extend(exprListResult.list);

        return tupleNode;
    }

    private _parseTestListAsExpression(errorString: string): ExpressionNode {
        if (this._isNextTokenNeverExpression()) {