[Haskell-beginners] Stack could not find libHStransformers

[Quentin Liu]

> What does this output: `which ghc ; stack exec which ghc`
`which ghc` gives "ghc not found”, while `stack exec which ghc` gives "/Users/HereWegoR/.stack/programs/x86_64-osx/ghc-8.0.2/bin/ghc”.

> What does your stack.yaml look like?
For this file I don’t have any stack.yaml. I just wrote the file and tried to load it into ghci.

> Do you have a .ghci or other kinds of local configuration file?
As far as I can tell, no.

Regards,
Qingbo Liu

On Dec 7, 2017, 11:33 -0500, Michael Snoyman <michael at snoyman.com>, wrote:
> Some ideas:
>
> * What does this output: `which ghc ; stack exec which ghc`
> * What does your stack.yaml look like?
> * Do you have a .ghci or other kinds of local configuration file?
>
> > On Thu, Dec 7, 2017 at 5:42 PM, Quentin Liu <quentin.liu.0415 at gmail.com> wrote:
> > > I am using ghc download and managed by stack. My stack is of the latest version, which is 1.6.1.
> > >
> > > Regards,
> > > Qingbo Liu
> > >
> > > On Dec 7, 2017, 01:56 -0500, Michael Snoyman <michael at snoyman.com>, wrote:
> > > > 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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