2.1.36 [ECMA-262/9:2018] Section 19.4.3.5 Symbol.prototype [ @@toStringTag ]

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V0179: Symbol.prototype[@@toStringTag] is not implemented because the @@toStringTag feature is not implemented

The specification states:

 19.4.3.5 Symbol.prototype [ @@toStringTag ]
  
     The initial value of the @@toStringTag property is the String value "Symbol".
  
     This property has the attributes { [[Writable]]: false, [[Enumerable]]: false, 
     [[Configurable]]: true }.

EdgeHTML Mode

Symbol.prototype[@@toStringTag] is not implemented because the @@toStringTag feature is not implemented.