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        A type X meets the ExecutionContext requirements
        if it is publicly and unambiguously derived from execution_context,
        and satisfies the additional requirements listed below.
      
        In the table below, x denotes a value of type X.
      
Table 16. ExecutionContext requirements
| expression | return type | 
                  assertion/note | 
|---|---|---|
| 
                   | 
                  type meeting  | |
| 
                   | Destroys all unexecuted function objects that were submitted via an executor object that is associated with the execution context. | |
| 
                   | 
                   | Returns an executor object that is associated with the execution context. |