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Date: Sun, 16 Nov 2014 15:37:09 -0800
From: Ray Andrews <rayandrews@eastlink.ca>
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To: Zsh hackers list <zsh-workers@zsh.org>
Subject: more tinkering with whence
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All good:
     $ whence -mav global
     global is a shell function
     global is /usr/local/bin/global

Rename the file:
     $ mv /usr/local/bin/global /usr/local/bin/gglobal

It now says 'not found', which is true, but ...
     $ whence -mav global
     global is a shell function
     global not found

Restart:
     $ zsh

... now it doesn't bother reporting that it's 'not found':
     $ whence -mav global
     global is a shell function

Rename the file back to 'global', and ...
     $ mv /usr/local/bin/gglobal /usr/local/bin/global

... the file isn't found at all:
     $ whence -mav global
     global is a shell function

Must restart to find it:
     $ zsh

... and there is is again:
     $ whence -mav global
     global is a shell function
     global is /usr/local/bin/global


Is there some way to update or inform whence that a new item
exists on the path, without restarting the shell? Is this
something involving the hash table?