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Re:Idiomatic Monads in Rust by lucozade on Thursday April 04, 2019 @01:59PM (#19575237)
He only suggesting adding associated traits to trait definitions from what I can see.

So there shouldn't be any extra abstraction cost. And any actual cost shouldn't be any larger than it is for traits generally.

I believe most of the controversy in this space is about language complexity cost.

Re:Idiomatic Monads in Rust by devit on Thursday April 04, 2019 @02:55PM (#19575847)
Compilation time is the other potential issue, although it's hard to predict it.