chakra can't recognize spread_syntax

[YiWen-y]

Version

chakra-1.11.24.0

Test case 1

var foo = function() {
    var o = [1,2,3];
    var a = [...o];
    print(a);
};
foo();

Execution steps 1

./ChakraCore/out/Release/ch Testcase1.js

Output 1

1,2,3

Test case 2

var foo = function() {
    var o = [1, 2, 3];
    var b = {...o};
    print(b);
    
};
foo();

Execution steps 2

./ChakraCore/out/Release/ch Testcase2.js

Output 2

SyntaxError: Expected identifier, string or number at code (Testcase2.js:3:14)

Expected behavior 2

[object Object]	

Description

When executing the above two test cases that both contain a spread operator .... When the operator ... is used in an array assignment statement at line 3 in Test case 1, the test case can be executed normally and output the correct result. But when it is used in an object assignment statement at line 3 in Test case 2, a SyntaxError exception was thrown shown as Output 2. I executed both test cases on other JS engines and they all output excepted results. I think it might be an issue of chakra.

Reference

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax