gistfile1.txt

~/hask$ cabal v2-repl --build-depends lens --build-depends megaparsec
Resolving dependencies...
Build profile: -w ghc-8.6.1 -O1
In order, the following will be built (use -v for more details):
 - fake-package-0 (lib) (first run)
Configuring library for fake-package-0..
Preprocessing library for fake-package-0..
Warning: No exposed modules
GHCi, version 8.6.1: http://www.haskell.org/ghc/  :? for help
Prelude> :load AoC0818.hs

<no location info>: error: can't find file: AoC0818.hs
Failed, no modules loaded.
Prelude> :cd ~/hask
Prelude> :load AoC0818.hs
[1 of 1] Compiling Main             ( AoC0818.hs, interpreted )
Ok, one module loaded.
Prelude> :browse Main
data main:Main.Tree = main:Main.Tree [main:Main.Tree] [Int]
main:Main.treeP :: Text.Megaparsec.Parsec () String main:Main.Tree
main:Main.metadata ::
  Control.Lens.Type.Traversal' main:Main.Tree Int
main:Main.children ::
  Control.Lens.Type.Traversal' main:Main.Tree main:Main.Tree
main:Main.leaf ::
  Control.Lens.Type.Fold main:Main.Tree main:Main.Tree
main:Main.metachildren ::
  Control.Lens.Type.Fold main:Main.Tree main:Main.Tree
main:Main.part1 :: main:Main.Tree -> Int
main:Main.part2 :: main:Main.Tree -> Int
main:Main.main :: IO ()
Prelude> import Main

<interactive>:1:1: error:
    attempting to use module ‘fake-package-0-inplace:Main’ (AoC0818.hs) which is not loaded
Prelude>