warning for duplicate definitions

[Mike Solomon]

Hey all,

I’m combining several documents into a large book tonight and I am positive 
that I have:

legato = \markup \italic “legato”

in at least 10 documents.  I’d like to consolidate these into a style sheet but 
I’m worried that I’ll miss some, so it’d be useful to issue a warning for 
duplicate definitions in case I miss some.  Is this possible?

Cheers,
MS