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Exactly. You could even do `for[F] { if x > 10 } yield 3`, which actually cleans up something that is currently kind of messy.
The compiler would need to know how to construct the value without an existing value to work from, so it would need to infer the companion object from the TC, and call `unit` on it, which would need to be added to all the monad types.
I'm not sure how that would work for anything other than simple type constructors (a type lambda has no companion), but those probably would be the *useful* cases.
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