Commit d93dc415 authored by Simon Peyton Jones's avatar Simon Peyton Jones
Browse files

Test Trac #6015

parent 6729fa6b
{-# LANGUAGE DataKinds, MultiParamTypeClasses, FunctionalDependencies,
PolyKinds, UndecidableInstances, ScopedTypeVariables #-}
module T6015 where
data Proxy a = Proxy
class Value a t | a -> t where value :: Proxy a -> t
instance Value True Bool where value _ = True
instance Value a t => Value (Just a) (Maybe t)
where value _ = Just (value (Proxy :: Proxy a))
test = value (Proxy :: Proxy (Just True))
......@@ -45,3 +45,4 @@ test('T6020a', normal, compile, [''])
test('T6044', normal, compile, [''])
test('T6054', normal, run_command, ['$MAKE -s --no-print-directory T6054'])
test('T6081', normal, compile, [''])
test('T6015', normal, compile, [''])
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