swamp-agr
commented
4 years ago Hi @henrylaxen,
If you launch cabal in verbose mode:
cabal v2-repl --verbose=3You will see that it examines both global and local package databases. Moreover, there will be cabal.project and cabal.project.local files that will bring some light on the context of ghci that was launched under the hood of cabal v2-repl.
When you execute ghci src/Fay/Conert.hs you will use only base and few more packages represented in global package database. In my case output was different:
GHCi, version 8.10.1: https://www.haskell.org/ghc/ :? for help
Loaded GHCi configuration from /Users/agr/.ghci
[1 of 1] Compiling Fay.Convert ( src/Fay/Convert.hs, interpreted )
src/Fay/Convert.hs:18:1: error:
Could not find module ‘Fay.Compiler.Prelude’
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
18 | import Fay.Compiler.Prelude
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:21:1: error:
Could not find module ‘Control.Spoon’
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
21 | import Control.Spoon
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:22:1: error:
Could not find module ‘Data.Aeson’
Perhaps you meant Data.Version (from base-4.14.0.0)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
22 | import Data.Aeson
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:23:1: error:
Could not find module ‘Data.Aeson.Types’
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
23 | import Data.Aeson.Types (parseEither)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:25:1: error:
Could not find module ‘Data.Generics.Aliases’
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
25 | import Data.Generics.Aliases
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:26:1: error:
Could not find module ‘Data.HashMap.Strict’
Perhaps you meant
Data.IntMap.Strict (from containers-0.6.2.1)
Data.Map.Strict (from containers-0.6.2.1)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
26 | import Data.HashMap.Strict (HashMap)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:27:1: error:
Could not find module ‘Data.HashMap.Strict’
Perhaps you meant
Data.IntMap.Strict (from containers-0.6.2.1)
Data.Map.Strict (from containers-0.6.2.1)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
27 | import qualified Data.HashMap.Strict as Map
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:31:1: error:
Could not find module ‘Data.Vector’
Perhaps you meant Data.Functor (from base-4.14.0.0)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
31 | import Data.Vector (Vector)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
src/Fay/Convert.hs:32:1: error:
Could not find module ‘Data.Vector’
Perhaps you meant Data.Functor (from base-4.14.0.0)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
32 | import qualified Data.Vector as Vector
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Failed, no modules loaded.
(0.14 secs,)There were no vector, aeson, unordered-containers, syb packages.
Thanks, @swamp-agr
henrylaxen
Dear Adam, Chris & co., First thank you for the service you are providing by writing and maintaining fay. I would be lost without it. I have what I hope is a very simple question. When I am in the top level fay directory, I can run:
cabal v2-repland after a few warnings, it compiles and I am greeted with the nice Fay> prompt.However, if I descend into the src/Fay directory and type:
ghci -i.. Convert.hsI get:
Upon examining the code, I don't see how it can possibly ever work.
According to the Data.Aeson.Types, UTCTime should be an instance of Generic but I can't find that anywhere. What magic is going on here? Can you explain or point me in the right direction to understand this. Thanks in advance. Best wishes, Henry Laxen