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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc241.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/tc241.hs | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc241.hs b/testsuite/tests/typecheck/should_compile/tc241.hs new file mode 100644 index 0000000000..8dca34314a --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc241.hs @@ -0,0 +1,13 @@ +{-# OPTIONS_GHC -XGADTs -XRankNTypes -O1 #-} +-- Trac #2018 + +module Bug1 where + + data A a where + MkA :: A () + + class C w where + f :: forall a . w a -> Maybe a + + instance C A where + f MkA = Just () |