diff options
Diffstat (limited to 'testsuite/tests/deriving/should_fail/T3833.hs')
| -rw-r--r-- | testsuite/tests/deriving/should_fail/T3833.hs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/testsuite/tests/deriving/should_fail/T3833.hs b/testsuite/tests/deriving/should_fail/T3833.hs new file mode 100644 index 0000000000..d1196c4112 --- /dev/null +++ b/testsuite/tests/deriving/should_fail/T3833.hs @@ -0,0 +1,9 @@ + +{-# LANGUAGE StandaloneDeriving #-} +-- {-# LANGUAGE GeneralizedNewtypeDeriving #-} + +import Data.Monoid + +newtype DecodeMap e = DecodeMap [e] + +deriving instance Monoid (DecodeMap e) |