The meaning of XEvent is different on the left and right sides of the newtype declaration. On the left, it's a type; on the right, it's a data constructor. The constructor wraps a value which refers to the type, but not recursively back to the constructor itself.

On Tue, Nov 6, 2018, 8:36 AM Guru Devanla <gurudev.devanla@gmail.com wrote:
Hello Haskell-Cafe,

I have been recently studying the XMonad code and some related types available in the X11 bindings library.

I came across this type:

newtype XEvent = XEvent XEventPtr


Available here: 

It seems that this type is circular here. how does one use this type? Is it possible to create a value out of this type? What is the use of this type?

Please could someone help me wrap my head around this?

Thanks






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