revent: Commit more reasonable variant of r474
revent: Commit more reasonable variant of r474

This part of r474 attempts to give a warning when autobinding
listeners where there appears to be a handler where there's no
event for it.  It was previously rolled back because it gave
bad warnings if you autobound to more than one event source.

This new variation works at least some of the time. Specifically,
if you are using a prefix, it may give warnings.  It also may
not.  Hopefully it won't give wrong ones.  Hopefully this is
better than nothing.

--HG--
extra : rebase_source : 5ed01e14e998fb6d961eb013a5ba107a5c7acd09

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