[Haskell-beginners] How to install new GHC ?

[Baa]

1. GHC 8.2.2 is here:
   ~/.stack/programs/x86_64-linux/ghc-tinfo6-8.2.2/bin
2. done
3. yes, it's 8.2.2
4. `cabal new-build` said to me call `cabal update`, I done it, then run
it again and got:
    $ cabal new-build
    Resolving dependencies...
    cabal: Could not resolve dependencies:
    trying: XXX-0.5.0.0 (user goal)
    next goal: YYY-utils (dependency of XXX-0.5.0.0)
    Dependency tree exhaustively searched.

> On Tue, Dec 12, 2017 at 02:53:47PM +0200, Baa wrote:
> > @Francesco: unfortunately nightly misses some package. So, I tried:
> > 
> >   $ stack --resolver=ghc-8.2.2 setup --reinstall
> >   Preparing to install GHC (tinfo6) to an isolated location. This
> > will not interfere with any system-level installation. Already
> > downloaded. Installed GHC.
> > 
> >   stack will use a sandboxed GHC it installed
> >   For more information on paths, see 'stack path' and 'stack exec
> > env' To use this GHC and packages outside of a project, consider
> > using: stack ghc, stack ghci, stack runghc, or stack exec
> > 
> > So seems that 8.2.2 was installed, right? But how to build the
> > project with new GHC now? I never used cabal before, `stack ghci`
> > still runs 8.0.2 instead of 8.2.2. Installed GHC 8.2.2 does not
> > correspond to .yaml file LTS - maybe this is a reason why old 8.0.2
> > is stil used...
> > 
> > When I try cabal build/new-build/repl I get:
> > 
> >   cabal: The program 'ghc' version >=6.4 is required but it could
> > not be found.
> > 
> > So, cabal does not know about installed GHC versions (at least
> > 8.0.2, used by stack). I tried --require-sandbox but without
> > success.  
> 
> Hey Paul,
>     four-step plan:
> 
> 1. check where stack installed ghc, it should be something like:
> 
>     ~/.stack/programs/x86_32-linux/ghc-nopie-8.2.1/lib/ghc-8.2.1/bin
> 
> 2. add these two lines to your `~/.bashrc`:
> 
>     export PATH=~/.cabal/bin:$PATH   # path to stuff built with cabal
>     export PATH=~/the.stackpathabove:$PATH # path to ghc
> 
> 3. check the right ghc version has been selected:
> 
>     ghc -v
>     # should be 8.2.2
> 
> 4. cd into your project and `cabal new-build` and then open a repl on
> it with `cabal new-repl`.
> 
> Let us know if this works!
> 
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