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What's with this C construct?

From: <aspiesrule at mcleodusa dot net>
To: <Hans dot Boehm at hp dot com>, <gcc at gcc dot gnu dot org>
Date: Sun, 30 Nov 2003 00:58:50 -0000
Subject: What's with this C construct?

I stumbled upon a construct that looks like this at line 263 of boehm-
gc/alloc.c:  "(void (*) GC_PROTO((void)))0" (minus the quotes, of course).  
What does this do???

Lucas

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