#7416: ghci "attempting to use module ... which is not loaded" after cabal install, in source dir -------------------------------------+------------------------------------- Reporter: j.waldmann | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: GHCi | Version: 7.6.1 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by phadej): A workaround which seems to work for hackage-security: First: write a .ghci file with: {{{ :load src/Prelude.hs import Prelude :set -XImplicitPrelude }}} As cabal doesn't give ability to pass /only/ ghci-flags atm use `cabal repl -v` or `cabal new-repl -v` to get a command line cabal uses: something like {{{ /opt/ghc/8.0.1/bin/ghc --interactive -fbuilding-cabal-package -O0 -outputdir ... }}} then add a `-XNoImplicitPrelude` there {{{ /opt/ghc/8.0.1/bin/ghc --interactive -XNoImplicitPrelude -fbuilding-cabal- package -O0 -outputdir ... }}} --- This works because - if `-XNoImplicitPrelude` is specified `ghci` doesn't implicitly load Prelude - after that `.ghci` file is loaded, where we load right `Prelude.hs` and import it, and turn implicit prelude on - loading of package proceeds It seems to work, but fragile it seems. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7416#comment:3> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler