Confusing GHC error message

[Simon Peyton-Jones]

Yes, good point.  I've improved the error message. It now reports a 
malformed class declaration.

S

| -----Original Message-----
| From: George Russell [mailto:ger at tzi.de] 
| Sent: 23 November 2001 13:22
| To: glasgow-haskell-bugs at haskell.org
| Subject: Confusing GHC error message
| 
| 
| (Yes, I know that's not very impressive, but you must all 
| have been wondering what's happened to me.)
| 
| The attached file, when compiled with ghc5.02.1, 
| -fglasgow-exts -fallow-overlapping-instances 
| -fallow-undecidable-instances produces the error message
|    Haskell.hs:11: Illegal left hand side in data/newtype 
| declaration This is rather confusing, as the error comes not 
| from the data declaration in the file, but because on the 
| next line "class" was accidentally typed, rather than "instance".
|