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on-channel-error channel procprocedure

Registers proc as an error handler on channel. Whenever a receiver raises an exception proc will be called with two arguments: the condition object and the message which made the receiver raise the exception. Note that all error handlers registered on a channel are called for every exception raised. When a message could not be handled successfully by any receiver (i.e. all receivers raised an exception) it remains queued up on the channel.