Should GHC.Parser.Lexer.P always be eta-expanded?
The PState parameter of the P monad seems like another case for the one-shot monad trick.
Although I find surprisingly few bindings that need eta-expansion in the Core GHC.Parser.Lexer.
Hmm, maybe we shouldn't eta-expand PState, because there might be some legit Alex Actions that profit from sharing? It's hard to tell, let's try and measure.
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