requesting specific Cabal version

[Simon Marlow]

Bulat Ziganshin wrote:

> what about adding to .cabal file ability to ask for specific Cabal
> version? it will allow to make incompatible changes between Cabal
> versions. program that uses services specific to Cabal 1.4.x, for
> example, will just ask for using this Cabal version and operation will
> go fine
> 
> of course, it will require to have cabal 1.4.x, 1.6.x and other
> versions simultaneously installed - just like now it's possible (in
> ghc) to have different versions of any other lib installed together

We already have this: the cabal-version field in the .cabal file specifies which 
version you want, and the cabal-setup program selects the right version. 
cabal-setup wasn't part of the recent Cabal release, but it's in the repository 
and will be in the next release (I hope).

Cheers,
	Simon