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-rw-r--r--tests/runtests.hs3
1 files changed, 2 insertions, 1 deletions
diff --git a/tests/runtests.hs b/tests/runtests.hs
index 321938b3..d3fa71de 100644
--- a/tests/runtests.hs
+++ b/tests/runtests.hs
@@ -39,7 +39,8 @@ check modules = do
ref <- readFile reffile
if not $ haddockEq out ref
then do
- putStrLn $ "Output for " ++ mod ++ " has changed! Exiting."
+ putStrLn $ "Output for " ++ mod ++ " has changed! Exiting with diff:"
+ system $ "diff " ++ reffile ++ " " ++ outfile
exitFailure
else do
putStrLn $ "Pass: " ++ mod