Hi,

I'm following the Stack user guide at 
https://docs.haskellstack.org/en/stable/GUIDE/. I've successfully followed 
the steps up to the "Resolvers" section with a new sample project. 

$ stack --version
Version 1.6.3 x86_64 hpack-0.20.0

I've also added "diagrams" to the list of dependencies and successfully 
done "stack build" and "stack test" etc. 

$ stack list-dependencies
Boolean 0.2.4
Cabal 2.0.1.1
...
diagrams 1.4
diagrams-contrib 1.4.1
diagrams-core 1.4.0.1
diagrams-lib 1.4.2
diagrams-solve 0.1.1
diagrams-svg 1.4.1.1
...

Once I try and import Diagrams.Prelude into the auto-created Lib.hs file 
stack claims it can't find Diagrams.Prelude:

/Users/foo/projects/test/src/Lib.hs:4:1: error:
    Could not find module ‘Diagrams.Prelude’
    Use -v to see a list of the files searched for.
  |
4 | import Diagrams.Prelude
  | ^^^^^^^^^^^^^^^^^^^^^^^


I can see diagrams 1.4 is in the curated package set that Stack is working 
with too. So is there something special about diagrams and how it should be 
installed or made known to Stack and Cabal?

Thanks in advance,

Stu

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