Method _parseChainAssignments

server/src/parser/parser.ts:2142–2168

(leftExpr: ExpressionNode)

    }

    private _parseChainAssignments(leftExpr: ExpressionNode): ExpressionNode {
        // Is the left side of the assignment assignable?
        const assignError = leftExpr.getAssignmentError();
        if (assignError) {
            this._addError(assignError, leftExpr);
        }

        let rightExpr: ExpressionNode | undefined;
        rightExpr = this._tryParseYieldExpression();
        if (!rightExpr) {
            rightExpr = this._parseTestListAsExpression('Expected expression to the right of "="');
        }

        if (rightExpr instanceof ErrorExpressionNode) {
            return rightExpr;
        }

        // Recurse until we've consumed the entire chain.
        if (this._consumeTokenIfOperator(OperatorType.Assign)) {
            rightExpr = this._parseChainAssignments(rightExpr);
            if (rightExpr instanceof ErrorExpressionNode) {
                return rightExpr;
            }
        }

        return new AssignmentNode(leftExpr, rightExpr);
    }

    private _parseTypeAnnotation(node: ExpressionNode): TypeAnnotationExpression {
        let rawExpression = node;