[Haskell-beginners] About ! before a type signature

Song Zhang vxanica at gmail.com
Fri Jun 6 11:23:06 UTC 2014

This is about syntax of Haskell.
I am reading the source code of Yampa. I find that a definition like the

data SF' a b where
    SFArr   :: !(DTime -> a -> Transition a b) -> !(FunDesc a b) -> SF' a b

in Yampa.hs.
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