This is needed for ghci to print results so i dont' think there's a workaround. You could use a cabal flag to configure your lib for repl use base conditionally, or so i assume. Or use an exe or test suite that adds the dep. HTH, Adam On Fri, 17 Mar 2017 at 12:51, Adam Steen wrote:

Hi

How can I use cabal repl (ghci) without base?

The following contrived example shows the error

-- minimal.hsmodule Minimal where

myId :: a -> a myId x = x

and

-- minimal.cabal name: minimal version: 0.0.1 build-type: Simple cabal-version: >= 1.10

library exposed-modules: Minimal --build-depends: base default-language: Haskell2010 default-extensions: NoImplicitPrelude

cabal build succeeds

$ cabal build Building minimal-0.0.1... Preprocessing library minimal-0.0.1...[1 of 1] Compiling Minimal ( Minimal.hs, dist\build\Minimal.o )

but cabal repl fails

$ cabal repl Preprocessing library minimal-0.0.1... GHCi, version 8.0.2: http://www.haskell.org/ghc/ :? for help <interactive>:1:6: error: Not in scope: `System.IO.hSetBuffering' No module named `System.IO' is imported. <interactive>:1:30: error: Not in scope: `System.IO.stdin' No module named `System.IO' is imported. <interactive>:1:46: error: Not in scope: data constructor `System.IO.NoBuffering' No module named `System.IO' is imported. <interactive>:1:70: error: Not in scope: `System.IO.hSetBuffering' No module named `System.IO' is imported. <interactive>:1:94: error: Not in scope: `System.IO.stdout' No module named `System.IO' is imported. <interactive>:1:111: error: Not in scope: data constructor `System.IO.NoBuffering' No module named `System.IO' is imported. <interactive>:1:135: error: Not in scope: `System.IO.hSetBuffering' No module named `System.IO' is imported. <interactive>:1:159: error: Not in scope: `System.IO.stderr' No module named `System.IO' is imported. <interactive>:1:176: error: Not in scope: data constructor `System.IO.NoBuffering' No module named `System.IO' is imported.

if i restore "build-depends: base" if works as expected.

$ cabal repl Preprocessing library minimal-0.0.1... GHCi, version 8.0.2: http://www.haskell.org/ghc/ :? for help[1 of 1] Compiling Minimal ( Minimal.hs, interpreted ) Ok, modules loaded: Minimal.*Minimal>

i know just keeping "build-depends: base" will make it work, but thats not what i am asking.

Note: this also applies for stack

Cheers

Adam

ps this is cross posted from stackoverflow http://stackoverflow.com/q/42823547/415681 _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.