RE: Problem with derived instances.

Crumbs!  You're right.  Albeit only in ghci mode, not when compiling.

This bug has been in GHC *forever*.  Will fix.

Workaround: compile that module

Simon



| -----Original Message-----
| From: Leon Smith [mailto:lps@xxxxxxxxxxx]
| Sent: 10 January 2003 06:25
| To: glasgow-haskell-bugs@xxxxxxxxxxx
| Subject: Problem with derived instances.
| 
| This code produces "True" with ghc-5.04.2 and ghc-5.02.3.   It works
as I
| would expect it to with ghc-4.08.1.  Similarly, the derived instances
of Ord
| also don't work.
| 
| The only time that I've found in my limited expermentation that
equality
| returns false is:
| 
| Str "a" == Str "ab"
| 
| best,
| leon
| 
| > infixr 3 :*
| > infixr 2 :+
| >
| > data RE a = RE a :+ RE a
| >           | RE a :* RE a
| >           | Cat  [RE a]
| >           | Star (RE a)
| >           | Plus (RE a)
| >           | Opt  (RE a)
| >           | Comp (RE a)
| >           | Empty
| >           | Str  [a]
| >             deriving (Show, Eq, Ord)
| >
| > main = print (Str "ab" == (Str "a" :+ Str "b"))
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