4.4BSD/usr/src/contrib/gcc-2.3.3/pself.c
Compare this file to the similar file:
23: OpenBSD-4.6/gnu/egcs/gcc/pself.c
23: Net2/usr/src/usr.bin/gcc/cc1/grot/print-self.c
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main(){char*p="main(){char*p=%c%s%c;(void)printf(p,34,p,34,10);}%c";(void)printf(p,34,p,34,10);}