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HoldFirst confusion

• To: mathgroup at smc.vnet.net
• Subject: [mg65503] HoldFirst confusion
• From: Yaroslav Bulatov <yaroslavvb at gmail.com>
• Date: Wed, 5 Apr 2006 06:56:00 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

The following gives an error
f = 5; f[a_] = a

Set is HoldFirst, so why does it evaluate it's first argument f[a_]?

Yaroslav