Step 10

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UPDATE

Stack and Code

StackExpression
(* realWorld)
upd * main
$2

Heap

VariableObject
$0
PAP(thenIO $1 $0)
$1
THUNK(poll_1 monadIO)
$2
PAP(thenIO $1 $0)
main
BLACKHOLE
monadIO
CON(Monad returnIO thenIO)
poll
FUN(monad ->
       let {
          ret_thunk = THUNK(return_1 monad unit);
          poll_poll_thunk = THUNK(poll_1 monad)
       } in then_1 monad ret_thunk poll_poll_thunk)
realWorld
CON(RealWorld)
return
FUN(monad ->
       case monad of {
          Monad return then -> return
       })
returnIO
FUN(x s -> (# s, x #))
then
FUN(monad ->
       case monad of {
          Monad return then -> then
       })
thenIO
FUN(m k s ->
       case m_? s of {
          (# new_s, result #) -> k_? new_s
       })
unit
CON(Unit)