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Diffstat (limited to 'testsuite/tests/typecheck/should_fail/T2994.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T2994.hs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_fail/T2994.hs b/testsuite/tests/typecheck/should_fail/T2994.hs new file mode 100644 index 0000000000..cd09745aba --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/T2994.hs @@ -0,0 +1,15 @@ +{-# LANGUAGE MultiParamTypeClasses #-} + +-- Trac #2994 + +module T2994 where + +class MonadReader a b + +newtype Reader' r a = Reader' (r -> a) + +instance MonadReader Int + +instance MonadReader (Reader' r) + +instance MonadReader r r (Reader' r) |