[Haskell-cafe] augmenting GHC package database

[Henning Thielemann]

On Fri, 28 Aug 2020, Sylvester Hazel via Haskell-Cafe wrote:

> The command 'stack ghci' configured older GHCi version 8.6.3 with all the needed packages.
> It is possible to reason about this library now.
> However, how to extend/modify this library and incorporate in my target (non-trivial) project is still beyond me.
> There must be some way of reverse engineering this binary library to .hs scripts, so I could add this modified to
> my project?

There might be a set of versions of all libraries to build your project, 
but one library may have too restrictive version bounds.

Cabal is more flexible than Stack in choosing sets of versions. You may 
use cabal's option --allow-newer=pkg1,pkg2,pkg3 and check whether Cabal 
can build your project anyway.