handle errors in lwt_unix_write_result
handle errors in lwt_unix_write_result

Ignore-this: 9ac9aa13e278aaa5edf6b520f9d0ac9a

darcs-hash:20101124065206-c41ad-a187011a313f13dd77f29ca97dd72088d6fdcb9a.gz

avsm/lwt-OLD,avsm/lwt-OLD