[Haskell-cafe] hledget: mtv vs transformers

Simon Michael simon at joyful.com
Fri Jan 21 02:37:55 CET 2011

You mean mtl 2.*, right ?

Yes that is a problem. I'm nervous about requiring mtl 2 because when  
I bumped hledger 0.13's process dependency to 0.14 for similar reasons  
it made all kinds of trouble for folks who just want to install the  
hledger core in standard/older haskell environments.

On Jan 20, 2011, at 5:11 PM, Dmitry Astapov wrote:
> Since hledger-chart depends on Chart, which in turn depends on  
> transformers 0.2.*, it will make a sense to bump all mtl  
> dependencies in hledger to 2.2
> When one does "make install" with older GHC (like 6.12.1, for  
> example), and mtl 1.x is available, it would be happily used for  
> hledger-lib and hledger, but compilation of hledger-chart will pull  
> in transformers 0.2 (but not the newer mtl) and will fail due to  
> conflicting instances.

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