Sexletter

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foralls in newtypes

2002-10-16 Thread Hal Daume III
I was reading the HFL libs, namely Control.Monad.Logic, and there's a definition in there: newtype Logic a = Logic { mkLogic :: (forall b. (a - b - b) - b - b) } I'm curious why this is legal, but newtype Logic2 a = forall b . Logic2 ((a - b - b) - b - b) is not... - Hal -- Hal Daume III

Database library?

2002-10-16 Thread Bryn Keller
Does anyone have a GHC-friendly library for accessing databases, specifically Oracle and MSSQL? I noticed Hasql on the Haskell libraries page, but it seems rather in the beginning stages, and I was hoping for native DB connections rather than ODBC ones. How are others handling database

Re: GHCI parse bug?

2002-10-16 Thread Hal Daume III
Yes, the spaces are necessary. This is because of the maximal munch rule; it assumes that '-\' is an identifier. In fact, you can define it as such: Prelude let (-\) a b = a + b Prelude 5 -\ 6 11 Prelude You can of course write Prelude let f = \x y z - x (map (+y) z) if you wish. -- Hal

Re: GHCI parse bug?

2002-10-16 Thread Bryn Keller
Ah, thanks. Hal Daume III wrote: Yes, the spaces are necessary. This is because of the maximal munch rule; it assumes that '-\' is an identifier. In fact, you can define it as such: Prelude let (-\) a b = a + b Prelude 5 -\ 6 11 Prelude You can of course write Prelude let f = \x

Re: Database library?

2002-10-16 Thread Seth Kurtzberg
I have an interface working with my database engine (www.cql.com). It is also in an early stage, but does not use ODBC. I believe that much of what I am doing will generalize reasonably well, but this is untested. I will be testing both Oracle and MSSQL soon, and I hope to have reasonable

Re: Database library?

2002-10-16 Thread Ashley Yakeley
At 2002-10-16 09:49, Bryn Keller wrote: Does anyone have a GHC-friendly library for accessing databases, specifically Oracle and MSSQL? My HBase project includes HMySQL, for accessing MySQL databases. It's kind of a separate project from HBase (because it uses FFI), but it's in the same CVS

Re: foralls in newtypes

2002-10-16 Thread Andrew J Bromage
G'day all. On Wed, Oct 16, 2002 at 07:54:17AM -0700, Hal Daume III wrote: I was reading the HFL libs, namely Control.Monad.Logic, and there's a definition in there: newtype Logic a = Logic { mkLogic :: (forall b. (a - b - b) - b - b) } I'm curious why this is legal, but newtype