Valery V. Vorotyntsev wrote:
Is there a way to tell GHCi ``Take Control.Monad.Trans from mtl package for this session'' or ``Use transformers this time'' without updating ghc-pkg config file (hide/expose)?
Henning Thielemann wrote:
With 'ghc-pkg hide' and 'expose' you can set your general preference. With '-hide-package mtl' and '-package transformers' you can choose per invokation of GHCi.
``When you say import A.B.C, from what package does A.B.C come?'' I've found [*] a hackage wiki page devoted to this question: http://hackage.haskell.org/trac/ghc/wiki/GhcPackages#Theopenquestion [*] I just tried to add `-hide-package mtl' to OPTIONS_GHC pragma, with no success, and was googling for a clue. Prelude> :load "/home/vvv/job/cdr.mscp/Codec/Binary/MSCP.hs" /home/vvv/job/cdr.mscp/Codec/Binary/MSCP.hs:1:15-39: unknown flag in {-# OPTIONS #-} pragma: -hide-package /home/vvv/job/cdr.mscp/Codec/Binary/MSCP.hs:1:15-39: unknown flag in {-# OPTIONS #-} pragma: mtl > -- vvv