2.1.33 [ECMA-262/9:2018] Section 19.4.2 Properties of the Symbol Constructor

V0161: The hasInstance, isConcatSpreadable, toPrimitive, and toStringTag properties of the Symbol constructor are not implemented.

The specification states:

 19.4.2 Properties of the Symbol Constructor
  
     The Symbol constructor:
  
         • has a [[Prototype]] internal slot whose value is the intrinsic object 
         %FunctionPrototype%.
         • has the following properties:

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The hasInstance, isConcatSpreadable, toPrimitive, and toStringTag properties of the Symbol constructor are not implemented.