Panic during error message

[Simon Peyton-Jones]

I've found and fixed this.  will commit shortly

| -----Original Message-----
| From: Marcin 'Qrczak' Kowalczyk [mailto:qrczak@knm.org.pl]=20
| Sent: 20 August 2001 15:23
| To: cvs-ghc@haskell.org
| Subject: Panic during error message
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| Prelude> let x =3D 64 in x:x
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| Ambiguous type variable(s) `a' in the constraint `Show a'=20
| arising from*** Exception: Oops!  Entered absent arg w_scKa=20
| TcMonad.InstOrigin{-ryl-}
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| --=20
|  __("<  Marcin Kowalczyk * qrczak@knm.org.pl=20
| http://qrczak.ids.net.pl/  \__/
|   ^^                     =20
| SYGNATURA ZAST=CAPCZA
| QRCZAK
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|=20
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