namespace import warning

When I require() some of my packages I am getting the warning

Warning message:
In namespaceImportFrom(self, asNamespace(ns)) :
  replacing previous import: show

I think this is coming from a chain of dependencies that result in the 
NAMESPACE from something (e.g. methods) being imported twice, but I 
can't figure it out, and don't really even see how to debug it. (One of 
my packages defines a method for show, but not a generic.)

Any suggestions?

Thanks,
Paul
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