Duncan Coutts wrote:
Hi folks,
I want to give you advance notice that I would like to make Cabal depend
on parsec. The implication is that GHC would therefore depend on parsec
and thus it would become a core package, rather than just a HP package.
So this would affect both GHC and the HP, though I hope not too much.
[..]
Why did I choose parsec? Practicality dictates that I can only use
things in the core libraries, and the nearest thing we have to that is
the parser lib that is in the HP. I tried to use happy but I could not
construct a grammar/lexer combo to handle the layout (also, happy is not
exactly known for its great error messages).
Reuse is good, but the implication I'm worried about is this: Can I
upgrade the parsec package installed on my system by doing a user
install from hackage ? Without an implementation of more flexible
package installations (multiple versions installed simultaneously), any
dependency of GHC has its version number essentially set into stone.
From this point of view, this proposal is not about making Cabal depend
on parsec , but about fixing the canonical version of parsec .
Best regards,
Heinrich Apfelmus
--
http://apfelmus.nfshost.com
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