#!/usr/bin/env runhaskell -v -i. -fglasgow-exts -fno-monomorphism-restriction
> {-# OPTIONS -fglasgow-exts #-}
> module Main where
> import Distribution.Simple
> import Distribution.Simple.Utils
> main :: IO ()
> main = defaultMainWithHooks defaultUserHooks
>        { runTests = \args _ _ _ -> performTests args }

Ugly and redundant but future Cabal tools may depend on this /-:

> performTests args
>     = rawSystemPath 0 "ghc" ["-e"
>                             ,"runUnitTests " ++ show debug
>                             ,"dist/build/conjure/conjure-tmp/sha1.o"
>                             ,"-fglasgow-exts"
>                             ,"-fno-monomorphism-restriction"
>                             ,"UnitTests.hs"]
>       where debug = "--debug" `elem` args