You need -fallow-undecidable-instances as well.

Simon

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