You can see how to configure stack here:
https://github.com/commercialhaskell/stack/blob/release/doc/yaml_configurati...
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
@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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