ui problem in lifting monad

[lengyijun]

https://lean-lang.org/doc/reference/latest/Functors___-Monads-and--do--Notation/Lifting-Monads/#MonadLift___mk

Example Lifting Transformed Monads

def incrBy (n : Nat) : StateM Nat Unit := modify (def incrOrFail : ReaderT Nat (ExceptT String (StateM Nat)) Unit := do
  if (← read) > 5 then throw "Too much!"
  incrBy (← read)

[david-christiansen]

That is indeed a problem! Thanks!

I'm out on vacation until the new year, but I'll take a look as soon as I'm back to work.