Method _parseLambdaExpression

server/src/parser/parser.ts:1845–1864

(allowConditional = true)

    // lambdef: 'lambda' [varargslist] ':' test
    private _parseLambdaExpression(allowConditional = true): LambdaNode {
        let labmdaToken = this._getKeywordToken(KeywordType.Lambda);

        let argList = this._parseVarArgsList(TokenType.Colon, false);

        if (!this._consumeTokenIfType(TokenType.Colon)) {
            this._addError('Expected ":"', this._peekToken());
        }

        let testExpr: ExpressionNode;
        if (allowConditional) {
            testExpr = this._parseTestExpression();
        } else {
            testExpr = this._tryParseLambdaExpression(false) || this._parseOrTest();
        }

        let lambdaNode = new LambdaNode(labmdaToken, testExpr);
        lambdaNode.parameters = argList;
        return lambdaNode;
    }

    private _tryParseLambdaExpression(allowConditional = true): LambdaNode | undefined {
        if (this._peekKeywordType() !== KeywordType.Lambda) {