On Mon, Apr 16, 2007 at 03:54:56PM +0100, Simon Marlow wrote:
- left-to-right impredicative instantiation: runST $ foo
This concerns me. With each ad-hoc extension of the type system, I worry that soon the GHC type system will become so byzantine and ill-specified that the type checker can only be cloned, not substantially improved on. I personally have a type checker idea I am working on, but I doubt I will ever be able to implement features such as this, because the type checking abstraction is now leaking badly. Once the Hindley-Damas-Milner algorithm is exposed, I fear programmers will rely on it and progress in Haskell typechecker implementation will be effectively halted. (Yes, I know I'm a bit late in complaining...)
- list fusion
Nitpick - you did mean stream fusion, right?
We think the above feature set makes for a pretty strong 6.8 release.
What do you think of this plan? Are there features/bug-fixes that you really want to see in 6.8?
Good code generation for loops. I understand they are rare in practice, but it's kinda disheartening to write memset() and see in the asm loop 11 memory references, 9 to the stack (numbers from unreliable memory). I don't mind the plan, either. Stefan