[web-devel] plugins and internal error: stg_ap_v_ret

[Andy Stewart]

Hi Michael,

plugins use it's own function instead GHC API, so it's easy to break
with new version GHC.

  -- Andy

Michael Snoyman <michael at snoyman.com>
writes:

> Hi all,
>
> I'm trying to convert wai-handler-devel to use plugins instead of
> hint, but cannot even get some basic usages to work properly. I've put
> together a minimal example that loads a WAI application from a
> separate file and runs it, but this immediately causes the program to
> crash saying:
>
> loader: internal error: stg_ap_v_ret
>     (GHC version 6.12.3 for i386_unknown_linux)
>     Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
>
> Is this an actual bug in GHC, or am I misusing the plugins package?
>
> The two source files:
>
> MyModule.hs
> {-# LANGUAGE OverloadedStrings #-}
> module MyModule where
>
> import Network.Wai
> import Data.ByteString.Lazy.Char8 ()
>
> myapp _ = responseLBS status200 [("Content-Type", "text/plain")] "myapp"
>
> loader.hs
> import System.Plugins.Make
> import System.Plugins.Load
> import Network.Wai.Handler.Warp (run)
>
> main :: IO ()
> main = do
>     MakeSuccess _ obj <- makeAll "MyModule.hs" []
>     LoadSuccess _ app <- load_ obj [] "myapp"
>     run 3000 app
>
> Thanks,
> Michael