register a printer for unix errors
register a printer for unix errors

Ignore-this: 7c2d2d8a38531475f9ba02baeff2fb87

darcs-hash:20110407153250-c41ad-df7250a817d41748ed932c9fa36d8365ec9025dd

rneswold/lwt,mirage/lwt,c-cube/lwt,rneswold/lwt,rgrinberg/lwt,ocsigen/lwt,ocsigen/lwt,fdopen/lwt,mfp/lwt,gfxmonk/lwt,rneswold/lwt,janestreet/lwt-async,rgrinberg/lwt,mfp/lwt,janestreet/lwt-async,rgrinberg/lwt,ocsigen/lwt,c-cube/lwt,rgrinberg/lwt,fdopen/lwt,c-cube/lwt,gfxmonk/lwt,mirage/lwt