Split from discussion about http://bugs.darcs.net/patch1245
This is a bug from shelly, we will have to way for a fix and then
probably bump the dependency.
Relevant bit (reported by Ganesh):
> In general failing tests are properly reported, but two tests in
> particular start failing silently (whereas they were passing
> before the switch). The two tests are emailformat.sh and
> latin9-input.sh and it turns out that the test harness itself
> is throwing something like "fd:25: hGetLine: invalid argument
> (invalid byte sequence)", which explains the lack of output.
The following patch sent by Ganesh Sittampalam <email@example.com> updated issue issue2449 with
* resolve issue2449: use new hook in shelly to handle test output as binary