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-- We test two things here:
--
-- 1. We expand only as much as necessary. In this case, we shouldn't expand T.
-- 2. When we find a difference(T3 and T5 in this case), we do minimal expansion
-- e.g. we don't expand both of them to T1, instead we expand T5 to T3.
module Main where
type T5 = T4
type T4 = T3
type T3 = T2
type T2 = T1
type T1 = Int
type T a = Int -> Bool -> a -> String
f :: T (T3, T5, Int) -> Int
f = undefined
a :: Int
a = f (undefined :: T (T5, T3, Bool))
main = print a
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