Instance Declaration discrepancy

[Simon Peyton-Jones]

You need -fallow-undecidable-instances as well.

Simon

| -----Original Message-----
| From: Saswat Anand [mailto:iscp9157@nus.edu.sg]=20
| Sent: 02 June 2001 10:13
| To: 'glasgow-haskell-users@haskell.org'
| Subject: Instance Declaration discrepancy
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| class MyShow a where
|  sh :: a -> String
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| instance (Integral a) =3D> Show a where
|  sh =3D "Integer " + show a
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| Ghc 5.00.1 (with -fglasgow-exts) does not accept the above,=20
| while hugs with extensions has no problem with this. Is it a bug?
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| Thanks,
| S
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