stack ghci doesn't see preprocessed (e.g. c2hs) files, and doesn't error #498
Description
Steps to reproduce:
$ stack --version
Version 0.1.1.0, Git revision bf086c6d5f8e86e95f161c38c596a6dae571ab65
pkg-a.cabal:
name: pkg-a
version: 0.1.0.0
build-type: Simple
cabal-version: >= 1.10
library
exposed-modules: A
build-depends: base >= 4.7 && < 5
default-language: Haskell2010
A.chs:
module A wherestack.yaml:
flags: {}
packages:
- '.'
extra-deps: []
resolver: nightly-2015-06-28Expected:
Running stack ghci builds and loads module A (after preprocessing with c2hs).
Actual:
$ stack ghci
Configuring GHCi with the following packages: pkg-a
GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help
Prelude λ import A
<no location info>:
Could not find module ‘A’
It is not a module in the current program, or in any known package.
Prelude λ
# ok, let's install it into stack work
$ stack build
pkg-a-0.1.0.0: build
Building pkg-a-0.1.0.0...
Preprocessing library pkg-a-0.1.0.0...
[1 of 1] Compiling A ( .stack-work/dist/x86_64-osx/Cabal-1.22.2.0/build/A.hs, .stack-work/dist/x86_64-osx/Cabal-1.22.2.0/build/A.o )
In-place registering pkg-a-0.1.0.0...
pkg-a-0.1.0.0: install
Installing library in
/Users/mtolly/git/stackbugs/.stack-work/install/x86_64-osx/nightly-2015-06-28/7.10.1/lib/x86_64-osx-ghc-7.10.1/pkga_9rCkBC6ycwY3RIqsB0Qe80
Registering pkg-a-0.1.0.0...
$ stack ghci
Configuring GHCi with the following packages: pkg-a
GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help
Prelude λ import A
<no location info>:
Could not find module ‘A’
It is a member of the hidden package ‘pkg-a-0.1.0.0@pkga_9rCkBC6ycwY3RIqsB0Qe80’.
Prelude λ
# this loads the installed (in stack work) package, not the current source
$ stack ghci --ghc-options "-package pkg-a"
Configuring GHCi with the following packages: pkg-a
GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help
Prelude λ import A
Prelude A λ
Leaving GHCi.
Actually you'll get this result if the A file is named anything other than A.hs (like A.foobar), or even if it doesn't exist at all.
So there are 2 bugs:
- Module
Ais not loaded when it's a non-.hsextension - The fact that module
Awasn't found while supposedly loadingpkg-adoes not cause an error