[Haskell-beginners] Stack could not find libHStransformers

[Michael Snoyman]

What version of Stack are you using (stack --version), and how did you
install Stack and GHC?

It looks like you're using a system-wide GHC installation, which (for
reasons like this) we by default no longer use by default in recent Stack
releases.

Upgrading to the latest Stack (via `stack upgrade` or following the
instructions at [1]) will probably solve the problem.

[1] https://haskell-lang.org/get-started/osx

On Thu, Dec 7, 2017 at 8:43 AM, Quentin Liu <quentin.liu.0415 at gmail.com>
wrote:

> Hi,
>
> I was trying to use Parsec and imported Text.ParserCombinators.Parsec. I
> could call “stack ghc” to compile the file, but when I loaded the file into
> ghci and called any function, ghci would report errors
>
> can't load .so/.DLL for: /Users/HereWegoR/.stack/
> snapshots/x86_64-osx/lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.
> 2/libHSmtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib
> (dlopen(/Users/HereWegoR/.stack/snapshots/x86_64-osx/
> lts-8.8/8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSmtl-2.2.1-
> BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib, 5): Library not loaded:
> /usr/local/opt/ghc/lib/ghc-8.0.2/transformers-0.5.2.0/
> libHStransformers-0.5.2.0-ghc8.0.2.dylib
>   Referenced from: /Users/HereWegoR/.stack/snapshots/x86_64-osx/lts-8.8/
> 8.0.2/lib/x86_64-osx-ghc-8.0.2/libHSmtl-2.2.1-
> BLKBelFsPB3BoFeSWSOYj6-ghc8.0.2.dylib
>   Reason: image not found)
>
>
> I tried to install transformers by calling `stack install transformers`
> but the problem still persisted. Is it because the version of transformers
> in my repo is different from the one referenced by `mtl` package? How
> should I fix it?
>
> Regards,
> Qingbo Liu
>
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