[Haskell-cafe] duplicate instance declarations. Why?

[Bulat Ziganshin]

Hello Alberto,

Friday, October 24, 2008, 12:20:39 PM, you wrote:

 >>instance  R a => A a
 >>instance S a => A a 
>   
>  Duplicate instance declarations
>  Why?

because you may write in other module

instance R Int
instance S Int

if class A includes functions, it may be problematic to determine
which implementation (via R or via S) to use


-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com