[Haskell-cafe] GHC 7.6.3 and Plugins

Jeremy Shaw jeremy at n-heptane.com
Fri Feb 28 19:56:17 UTC 2014

I honestly have no idea whatsoever. The plugins library was written by
somebody else and I am the maintainer only in the sense that I will
apply patches that people send.

That said, I really want a working, modern version of the plugins
library that uses the GHC-API and integrates with cabal and cabal
sandboxes. I have started such a library here:


It is pretty much only proof of concept at the moment. But there is a
working example. It desperately needs additional developers though if
it is going to be usable anytime soon.

- jeremy

On Mon, Feb 24, 2014 at 7:12 AM, Fabian Bergmark
<fabian.bergmark at gmail.com> wrote:
> Im using the plugins library and am unable get it to work with user
> defined types. I.e. evaluating the string "id :: Int -> Int" works,
> but "id :: Test -> Test" yield the runtime-error.
> test: /tmp/MXXXXX27601.o: unknown symbol
> `testdzm0zi0zi0_DataziTestD_zdfTypeableTestD_closure'
> I have created a small compiling example of the bug here
> https://github.com/fabianbergmark/plugins-bug
> I have tried to move the data-type to a separate library without success.
> Curiously, loading the library exposing the data-type in GHCi, and
> running eval "id :: Test -> Test" works and yields the correct result.
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