Proposal: Let OpenGL depend on the StateVar package

[Edward Kmett]

At the risk of bikeshedding things to death:

Another option on that front is to just remove the concept of a
"GettableStateVar" entirely and substitute 'IO', then 'get' is 'id' or even
'liftIO' and there is no dilemma about whether to use a GettableStateVar or
a boring IO action -- and you aren't playing catchup writing instance after
instance.

type GettableStateVar = IO

would just work.

​-Edward
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