error - return an error
Rerror tag  ename 
The Rerror request return an error string, of length 64 (ERRLEN in <lib9.h>), describing the failure of a transaction. It replaces the corresponding reply message that would accompany a successful call; its tag is that of the request.
There is no Terror in Inferno. Rerror is the only case in this protocol of a response message type without a corresponding request type.
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