make Lwt_io.pipe raise Sys_error
make Lwt_io.pipe raise Sys_error

Ignore-this: 8a11a77ae6920d63bd97ab59e0497c74

darcs-hash:20100210091715-c41ad-5453152d2753bba8e059e5b86ec1fd4dfb85bf99.gz

avsm/lwt-OLD,avsm/lwt-OLD