resume
If the fiber was PAUSED by a debugger, transition it immediately into the UNPAUSING state, and cause an AvailTask to be queued and eventually executed to resume running it.
If the fiber subsequently pauses due to the debugger, it will enter the PAUSED state again. Any other transitions to suspended states will be handled normally.
If the function successfully runs to completion, then the fiber's "on success" continuation will be invoked with the function's result.
If the function fails for any reason, then the fiber's "on failure" continuation will be invoked with the terminal throwable.
Parameters
a
The fiber to allow to continue running.