Public bug reported:

Binary package hint: ghc6

ghci is the interpreter mode of GHC, the Glasgow Haskell Compiler.

In Dapper I could use GHCi.  After upgrading to Edgy:
$ ghci
ghc-6.4.2: not built for interactive use

This also affects the runhaskell/runghc commands.  This interferes with
using the Haskell Cabal build infrastructure, although `runhugs +98
Setup.lhs [arguments...]`can be used instead to work around this
particular problem. (The +98 is needed to work around a problem with the
Haskell interpreter "hugs", but I'm not sure if /that's/ more Edgy's or
Hugs's fault.)

IIRC, GHC needs to be built with the exact same version of itself in
order for GHCi to work.

It's too bad edgy's ghc is only 6.4.2 not 6.6, but I suppose that (1) is
irrelevant and (2) can't be changed now that Edgy is released.

** Affects: ghc6 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
no ghci in edgy (regression vs dapper)
https://launchpad.net/bugs/70302

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