interaction between hint and doctest

[gelisam]

Looks like issue #11 is back. I see in that thread that the root cause was in ghc, maybe I should report it there instead? Anyway, on to the actual bug report.

In a file called Main.hs:

import Test.DocTest
import Language.Haskell.Interpreter

-- |
-- >>> True
-- True
main :: IO ()
main = do
    _ <- runInterpreter $ interpret "()" (as :: ())
    doctest ["Main.hs"]
    return ()

The program fails with Main.hs: Too late for parseStaticFlags: call it before newSession. But there is an easy workaround: if I swap the calls to runInterpreter and doctest, I get Examples: 1 Tried: 1 Errors: 0 Failures: 0, as expected.

(By the way, doctest is my favorite testing framework ever! And it makes so much more sense to use that strategy in Haskell than in python.)

[sol]

Hey, I'm on holiday until January 20th. I'll into it when I'm back ;)

BTW, exact versions of everything could useful.

[gelisam]

$ doctest --version
doctest version 0.9.10
using version 7.6.3 of the GHC API
using /usr/local/Cellar/ghc/7.6.3/bin/ghc-7.6.3
$ cabal info hint | grep installed:
    Versions installed: 0.3.3.7

[gelisam]

The issue also occurs with the oldest versions of doctest and hint I can install without reinstalling ghc:

$ doctest --version
doctest version 0.8.0.1
using version 7.6.3 of the GHC API
$ cabal info hint | grep installed:
    Versions installed: 0.3.3.5

[gelisam]

The issue was indeed in ghc, closing.
The problem disappeared when I switched to 7.8:

$ doctest --version
doctest version 0.9.11
using version 7.8.2 of the GHC API
$ runhaskell-7.6 Main.hs
Main.hs: Too late for parseStaticFlags: call it before newSession
$ runhaskell-7.8 Main.hs
Examples: 1  Tried: 1  Errors: 0  Failures: 0

[sol]

Ok, cool :)