[Haskell-cafe] Why purely in haskell?

[Neil Mitchell]

Hi Shen,

> I got question about why haskell insist to be a purely FL. I mean is
> there any feature which is only support by pure?

Laziness. It is very difficult to have a lazy language which is not pure.

Laziness and purity together help with equational reasoning, compiler
transformations, less obscure bugs, better compositionality etc.

Thanks

Neil