C preprocessor question

[brett at wjvax.UUCP]

I have a question about the C preprocessor.  I have the following code
fragment, which fails to compile on my system (4.2BSD):

#define	GROUP(group,subgroup)	(((group) << 8) | (subgroup))

#if	GROUP(0,0)
#endif

The #if chokes for some reason.  Can anyone in comp.lang.c see my error?
If there is no error, is this a known bug of the 4.2BSD cpp?
-- 
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Brett Galloway
{pesnta,twg,ios,qubix,turtlevax,tymix,vecpyr,certes,isi}!wjvax!brett