regression: GHCi command output can no longer be redirected on a by-command basis

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)

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Trac metadata

Trac field	Value
Version	6.12.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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