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Proper style for argument checking?

• To: mathgroup at smc.vnet.net
• Subject: [mg111937] Proper style for argument checking?
• From: Yaroslav Bulatov <yaroslavvb at gmail.com>
• Date: Fri, 20 Aug 2010 07:06:05 -0400 (EDT)

I have a function, and I'd like to do several checks on arguments
before evaluating it. If some check fails, I want the function to
return unevaluated and print corresponding error message, what's the
proper style of doing it?

Help for "Message" gives an example for a single check, but it seems
awkward to use same form for multiple checks.