Commit bdb48a69 authored by Simon Peyton Jones's avatar Simon Peyton Jones
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parent edf395e7
......@@ -17,4 +17,10 @@ instance Foo t => Sat (FooD t)
instance Data FooD a => Foo a
instance Foo a => Foo [a]
-- Have: Foo a, Data FooD a, Foo [a]
--
-- Want superclasses: (Data FooD [a])
-- and hence: Sat (FooD [a]), Data FooD a
-- and hence: Foo [a]
instance Foo [Char]
{-# OPTIONS -fglasgow-exts #-}
{-# LANGUAGE RankNTypes, ScopedTypeVariables #-}
module ShouldCompile where
......
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