id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
4332	regression: GHCi command output can no longer be redirected on a by-command basis	claus		"For writing advanced GHCi scripts, it is very helpful to be able to redirect the output of individual GHCi commands, for further processing by user-defined GHCi commands.

This no longer works in GHCi 6.12.3 (probably has stopped working earlier) on Windows. Surprisingly, the issue is not consistent - for instance, `:type` can still be redirected, `:info` cannot.
{{{
------------- example session output, using attached 'redir.script'
$ ghcii.sh -ignore-dot-ghci
GHCi, version 6.12.3: http://www.haskell.org/ghc/  :? for help
..
Prelude> :cmd readFile ""redir.script""
Prelude> :redir x :t map
..
Prelude> x
""-- logging GHCi stdout\nmap :: (a -> b) -> [a] -> [b]\n""
Prelude> :redir y :i map
Prelude> y
""-- logging GHCi stdout\n*** Exception: WriteConsole: invalid argument (Das Handle ist ung\252ltig.)\n""
------ (that error message states that the handle is not valid)
}}}

[http://www.haskell.org/pipermail/glasgow-haskell-users/2010-September/019223.html Mailing list thread]
"	bug	closed	normal	7.0.1	GHCi	6.12.3	fixed			Windows	Unknown/Multiple	None/Unknown