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        A type X meets the AsyncReadStream requirements
        if it satisfies the requirements listed below.
      
        In the table below, a denotes a value of type X,
        mb denotes a (possibly const) value satisfying the MutableBufferSequence
        requirements, and t is a completion token.
      
Table 4. AsyncReadStream requirements
| operation | type | semantics, pre/post-conditions | 
|---|---|---|
| 
                   | A type satisfying the Executor requirements. | Returns the associated I/O executor. | 
| 
                   | The return type is determined according to the requirements for an asynchronous operation. | 
                  Meets the requirements for a read
                  operation and an asynchronous
                  operation with completion signature  |