2.1.59 [ECMA-262/9:2018] Section 25.5 AsyncGenerator Objects

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V0217: AsyncGenerator objects are not supported

The specification states:

 25.5 AsyncGenerator Objects
  
     An AsyncGenerator object is an instance of an async generator function and conforms 
     to both the AsyncIterator and AsyncIterable interfaces.
  
     AsyncGenerator instances directly inherit properties from the object that is the 
     value of the prototype property of the AsyncGenerator function that created the 
     instance. AsyncGenerator instances indirectly inherit properties from the 
     AsyncGenerator Prototype intrinsic, %AsyncGeneratorPrototype%.

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AsyncGenerator objects are not supported.