[CM] s7: warning if symbol is redefined and namespaces

[Kjetil Matheussen]

Hi Bill,

I'm starting to get a bit worried about overriding global symbols
without noticing it.

Is there a way to get a message printed to the screen, or maybe create a
hook
for doing so, if a symbol is redefined?

Also, what about namespaces and workarounds? For instances,
Is there a way to load a file without polluting the global namespace,
for instance something like this:

"
(let ()
   (load "reverse-sound.scm")
   (reverse-sound sound))
"

...where the 'reverse-sound' symbol in reverse-sound.scm is not available
globally.
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