[m-rev.] diff: fix bug in error messages

[Ralph Becket]

Mark Brown, Thursday, 19 May 2005:
> 
> This should be allowed, since overloading of function symbols is legal,
> and module qualification can be used to resolve any problems.  In other
> words, '' should be treated the same as apply/N.

Personally I think we'd be justified in keeping '' as a reserved word,
just on the grounds of preventing some bad taste...
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