On Fri, 5 Oct 2018 at 9:00 PM, Jurriaan Hage <j.h...@uu.nl> wrote: > > We first go the slavish route, to provide a basis for changing things > later.
Ah. That comment seemed strange, but I've just read up on Helium: you're aiming to provide a beginners' environment for Haskell. Then without type classes, I'm wondering what Helium is doing now for arithmetic or equality-testing or show or read? Do you mean you've somehow 'faked' the Prelude classes, but don't yet allow programmers to declare their own classes/instances? Being able to declare your own datatypes without writing instances for them seems particularly awkward. If Helium essentially supports less than H98, I'm wondering why you didn't start with Hugs, and work on it giving better error messages? I'm finding Hugs very easy to hack; the messages are particularly easy to work with. (OK it's written in C++, but the 'interesting' parts are just function calls, so the host language seems irrelevant.) AntC
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