[Haskell-beginners] How to install new GHC ?

[Baa]

@David: I tried to switch to nightly but in project's .yaml file and
got error about missing of some library (as I understand, it is missing
in last nightly). So, if I try to do it through .yaml file then how to
use new GHC (8.2.2) but with LTS for 8.0.2? Is it possible? I need last
stable LTS where all libraries (using in the projects) exist, but with
new GHC 8.2.2 which is too new for stable LTS. As I read somewhere, GHC
version and Stackage version are linked together hardly in stack tool,
or?

> You can see how to configure stack here:
> https://github.com/commercialhaskell/stack/blob/release/doc/yaml_configuration.md
> 
> The short of it is that to have stack ghci choose a particular
> version of ghc, you probably need to modify
> ~/.stack/global/stack.yaml, change resolver to something here
> https://www.stackage.org/snapshots that has your version of ghc and
> dependencies similar to what your project wants.  For example
> 'nightly-2017-12-10'.
> 
> On Tue, Dec 12, 2017 at 7:53 AM, Baa <aquagnu at gmail.com> 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.
> >
> >  
> > > On Tue, Dec 12, 2017 at 01:56:03PM +0200, Baa wrote:  
> > > > Would somebody explain me what is wrong here and how I can test
> > > > a project with new 8.2.2 GHC?  
> > >
> > > Hello Paul, I don't think stack lts has 8.2.2 just yet. Use a
> > > nightly or download/install ghc from here and compile your project
> > > with the new `cabal new-build`.
> > >
> > > [1] https://www.haskell.org/ghc/download_ghc_8_2_2.html#binaries
> > >
> > >
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