********** source program **********
choice Ints {
alt None ();
alt One (0 = Int);
alt Two (0 = Int, 1 = Int);
}
fn main () -> Int {
var auto: x = Ints.None();
var auto: y = Ints.One(0 = 42);
var auto: n = 0;
match (y) {
case Ints.None =>
n = (n + 2);
case Ints.One(0 = auto: x) =>
n = ((x + 1) - 42);
case Ints.Two(0 = auto: a, 1 = auto: b) =>
n = 2;
}
match (x) {
case Ints.One(0 = auto: x) =>
n = (x + 2);
case Ints.None() =>
n = (n - 1);
case Ints.Two(0 = auto: x, 1 = auto: y) =>
n = 5;
}
return n;

}
choice MoreInts {
alt None ();
alt One (0 = Int);
alt Two (0 = Int, 1 = Int);
}
********** type checking **********
--- step exp () --->
--- step exp (0 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int)<1>(Int,) --->
--- step exp (0 = Int, 1 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<1>(Int,) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<2>(Int,Int,) --->
--- step exp Int --->
--- step exp () --->
--- step exp (0 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int)<1>(Int,) --->
--- step exp (0 = Int, 1 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<1>(Int,) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<2>(Int,Int,) --->
--- step exp Int --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->
--- step exp auto --->

********** type checking complete **********
choice Ints {
alt None ();
alt One (0 = Int);
alt Two (0 = Int, 1 = Int);
}
fn main () -> Int {
var auto: x = Ints.None();
var auto: y = Ints.One(0 = 42);
var auto: n = 0;
match (y) {
case Ints.None =>
n = (n + 2);
case Ints.One(0 = auto: x) =>
n = ((x + 1) - 42);
case Ints.Two(0 = auto: a, 1 = auto: b) =>
n = 2;
}
match (x) {
case Ints.One(0 = auto: x) =>
n = (x + 2);
case Ints.None() =>
n = (n - 1);
case Ints.Two(0 = auto: x, 1 = auto: y) =>
n = 5;
}
return n;
}
choice MoreInts {
alt None ();
alt One (0 = Int);
alt Two (0 = Int, 1 = Int);
}
********** starting execution **********
********** initializing globals **********
--- step exp () --->
--- step exp (0 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int)<1>(Int,) --->
--- step exp (0 = Int, 1 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<1>(Int,) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<2>(Int,Int,) --->
--- step exp () --->
--- step exp () --->
--- step exp (0 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int)<1>(Int,) --->
--- step exp (0 = Int, 1 = Int) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<1>(Int,) --->
--- step exp Int --->
--- handle value Int with (0 = Int, 1 = Int)<2>(Int,Int,) --->
********** calling main function **********
{
stack: top{main()<-1>}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp main() --->
{
stack: top{main<-1> :: main()<0>}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp main --->
{
stack: top{fun<main><-1> :: main()<0>}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value fun<main> with main()<1>(fun<main>,) --->
{
stack: top{()<-1> :: main()<1>(fun<main>,)}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp () --->
{
stack: top{()<-1> :: main()<1>(fun<main>,)}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value () with main()<2>(fun<main>,(),) --->
pattern_match((), ())
{
stack: main{var auto: x = Ints.None(); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt var auto: x = Ints.None(); ...  --->
{
stack: main{var auto: x = Ints.None();<-1> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt var auto: x = Ints.None(); --->
{
stack: main{Ints.None()<-1> :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.None() --->
{
stack: main{Ints.None<-1> :: Ints.None()<0> :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.None --->
{
stack: main{Ints<-1> :: Ints.None<0> :: Ints.None()<0> :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue Ints --->
{
stack: main{ptr<3><-1> :: Ints.None<0> :: Ints.None()<0> :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<3> with Ints.None<1>(ptr<3>,) --->
{
stack: main{Ints.None<-1> :: Ints.None()<0> :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value Ints.None with Ints.None()<1>(Ints.None,) --->
{
stack: main{()<-1> :: Ints.None()<1>(Ints.None,) :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp () --->
{
stack: main{()<-1> :: Ints.None()<1>(Ints.None,) :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value () with Ints.None()<2>(Ints.None,(),) --->
{
stack: main{alt Ints.None ()<-1> :: var auto: x = Ints.None();<0> :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.None () with var auto: x = Ints.None();<1>(alt Ints.None (),) --->
{
stack: main{auto: x<-1> :: var auto: x = Ints.None();<1>(alt Ints.None (),) :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto: x --->
{
stack: main{auto<-1> :: auto: x<0> :: var auto: x = Ints.None();<1>(alt Ints.None (),) :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto --->
{
stack: main{auto<-1> :: auto: x<0> :: var auto: x = Ints.None();<1>(alt Ints.None (),) :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto with auto: x<1>(auto,) --->
{
stack: main{auto: x<-1> :: var auto: x = Ints.None();<1>(alt Ints.None (),) :: var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto: x with var auto: x = Ints.None();<2>(alt Ints.None (),auto: x,) --->
pattern_match(auto: x, alt Ints.None ())
{
stack: main{var auto: y = Ints.One(0 = 42); ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt var auto: y = Ints.One(0 = 42); ...  --->
{
stack: main{var auto: y = Ints.One(0 = 42);<-1> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt var auto: y = Ints.One(0 = 42); --->
{
stack: main{Ints.One(0 = 42)<-1> :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.One(0 = 42) --->
{
stack: main{Ints.One<-1> :: Ints.One(0 = 42)<0> :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.One --->
{
stack: main{Ints<-1> :: Ints.One<0> :: Ints.One(0 = 42)<0> :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue Ints --->
{
stack: main{ptr<3><-1> :: Ints.One<0> :: Ints.One(0 = 42)<0> :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<3> with Ints.One<1>(ptr<3>,) --->
{
stack: main{Ints.One<-1> :: Ints.One(0 = 42)<0> :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value Ints.One with Ints.One(0 = 42)<1>(Ints.One,) --->
{
stack: main{(0 = 42)<-1> :: Ints.One(0 = 42)<1>(Ints.One,) :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp (0 = 42) --->
{
stack: main{42<-1> :: (0 = 42)<0> :: Ints.One(0 = 42)<1>(Ints.One,) :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp 42 --->
{
stack: main{42<-1> :: (0 = 42)<0> :: Ints.One(0 = 42)<1>(Ints.One,) :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 42 with (0 = 42)<1>(42,) --->
{
stack: main{(0 = 42@12)<-1> :: Ints.One(0 = 42)<1>(Ints.One,) :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value (0 = 42@12) with Ints.One(0 = 42)<2>(Ints.One,(0 = 42@12),) --->
{
stack: main{alt Ints.One (0 = 42@13)<-1> :: var auto: y = Ints.One(0 = 42);<0> :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.One (0 = 42@13) with var auto: y = Ints.One(0 = 42);<1>(alt Ints.One (0 = 42@13),) --->
{
stack: main{auto: y<-1> :: var auto: y = Ints.One(0 = 42);<1>(alt Ints.One (0 = 42@13),) :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto: y --->
{
stack: main{auto<-1> :: auto: y<0> :: var auto: y = Ints.One(0 = 42);<1>(alt Ints.One (0 = 42@13),) :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto --->
{
stack: main{auto<-1> :: auto: y<0> :: var auto: y = Ints.One(0 = 42);<1>(alt Ints.One (0 = 42@13),) :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto with auto: y<1>(auto,) --->
{
stack: main{auto: y<-1> :: var auto: y = Ints.One(0 = 42);<1>(alt Ints.One (0 = 42@13),) :: var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 
env: x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto: y with var auto: y = Ints.One(0 = 42);<2>(alt Ints.One (0 = 42@13),auto: y,) --->
pattern_match(auto: y, alt Ints.One (0 = 42@13))
{
stack: main{var auto: n = 0; ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt var auto: n = 0; ...  --->
{
stack: main{var auto: n = 0;<-1> :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt var auto: n = 0; --->
{
stack: main{0<-1> :: var auto: n = 0;<0> :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp 0 --->
{
stack: main{0<-1> :: var auto: n = 0;<0> :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 0 with var auto: n = 0;<1>(0,) --->
{
stack: main{auto: n<-1> :: var auto: n = 0;<1>(0,) :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto: n --->
{
stack: main{auto<-1> :: auto: n<0> :: var auto: n = 0;<1>(0,) :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto --->
{
stack: main{auto<-1> :: auto: n<0> :: var auto: n = 0;<1>(0,) :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto with auto: n<1>(auto,) --->
{
stack: main{auto: n<-1> :: var auto: n = 0;<1>(0,) :: match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 
env: y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto: n with var auto: n = 0;<2>(0,auto: n,) --->
pattern_match(auto: n, 0)
{
stack: main{match (y) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt match (y) {...} ...  --->
{
stack: main{match (y) {...}<-1> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt match (y) {...} --->
{
stack: main{y<-1> :: match (y) {...}<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp y --->
{
stack: main{alt Ints.One (0 = 42@14)<-1> :: match (y) {...}<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.One (0 = 42@14) with match (y) {...}<1>(alt Ints.One (0 = 42@14),) --->
{
stack: main{Ints.None<-1> :: match (y) {...}<1>(alt Ints.One (0 = 42@14),) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.None --->
{
stack: main{Ints<-1> :: Ints.None<0> :: match (y) {...}<1>(alt Ints.One (0 = 42@14),) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue Ints --->
{
stack: main{ptr<3><-1> :: Ints.None<0> :: match (y) {...}<1>(alt Ints.One (0 = 42@14),) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<3> with Ints.None<1>(ptr<3>,) --->
{
stack: main{Ints.None<-1> :: match (y) {...}<1>(alt Ints.One (0 = 42@14),) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value Ints.None with match (y) {...}<2>(alt Ints.One (0 = 42@14),Ints.None,) --->
pattern_match(Ints.None, alt Ints.One (0 = 42@14))
{
stack: main{Ints.One(0 = auto: x)<-1> :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.One(0 = auto: x) --->
{
stack: main{Ints.One<-1> :: Ints.One(0 = auto: x)<0> :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.One --->
{
stack: main{Ints<-1> :: Ints.One<0> :: Ints.One(0 = auto: x)<0> :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue Ints --->
{
stack: main{ptr<3><-1> :: Ints.One<0> :: Ints.One(0 = auto: x)<0> :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<3> with Ints.One<1>(ptr<3>,) --->
{
stack: main{Ints.One<-1> :: Ints.One(0 = auto: x)<0> :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value Ints.One with Ints.One(0 = auto: x)<1>(Ints.One,) --->
{
stack: main{(0 = auto: x)<-1> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp (0 = auto: x) --->
{
stack: main{auto: x<-1> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto: x --->
{
stack: main{auto<-1> :: auto: x<0> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto --->
{
stack: main{auto<-1> :: auto: x<0> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto with auto: x<1>(auto,) --->
{
stack: main{auto: x<-1> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto: x with (0 = auto: x)<1>(auto: x,) --->
{
stack: main{(0 = auto: x@19)<-1> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value (0 = auto: x@19) with Ints.One(0 = auto: x)<2>(Ints.One,(0 = auto: x@19),) --->
{
stack: main{alt Ints.One (0 = auto: x@20)<-1> :: match (y) {...}<3>(alt Ints.One (0 = 42@14),Ints.None,) :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.One (0 = auto: x@20) with match (y) {...}<4>(alt Ints.One (0 = 42@14),Ints.None,alt Ints.One (0 = auto: x@20),) --->
pattern_match(alt Ints.One (0 = auto: x@20), alt Ints.One (0 = 42@14))
pattern_match((0 = auto: x@20), (0 = 42@14))
pattern_match(auto: x, 42)
{
stack: main{n = ((x + 1) - 42);<-1> :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt n = ((x + 1) - 42); --->
{
stack: main{n<-1> :: n = ((x + 1) - 42);<0> :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue n --->
{
stack: main{ptr<16><-1> :: n = ((x + 1) - 42);<0> :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<16> with n = ((x + 1) - 42);<1>(ptr<16>,) --->
{
stack: main{((x + 1) - 42)<-1> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp ((x + 1) - 42) --->
{
stack: main{(x + 1)<-1> :: ((x + 1) - 42)<0> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp (x + 1) --->
{
stack: main{x<-1> :: (x + 1)<0> :: ((x + 1) - 42)<0> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp x --->
{
stack: main{42<-1> :: (x + 1)<0> :: ((x + 1) - 42)<0> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 42 with (x + 1)<1>(42,) --->
{
stack: main{1<-1> :: (x + 1)<1>(42,) :: ((x + 1) - 42)<0> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp 1 --->
{
stack: main{1<-1> :: (x + 1)<1>(42,) :: ((x + 1) - 42)<0> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 1 with (x + 1)<2>(42,1,) --->
{
stack: main{43<-1> :: ((x + 1) - 42)<0> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 43 with ((x + 1) - 42)<1>(43,) --->
{
stack: main{42<-1> :: ((x + 1) - 42)<1>(43,) :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp 42 --->
{
stack: main{42<-1> :: ((x + 1) - 42)<1>(43,) :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 42 with ((x + 1) - 42)<2>(43,42,) --->
{
stack: main{1<-1> :: n = ((x + 1) - 42);<1>(ptr<16>,) :: {
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 1 with n = ((x + 1) - 42);<2>(ptr<16>,1,) --->
{
stack: main{{
 ... 
}
<0> :: match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, 42, 
env: x: 42, n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt {
 ... 
}
 --->
{
stack: main{match (x) {...} ... <-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt match (x) {...} ...  --->
{
stack: main{match (x) {...}<-1> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt match (x) {...} --->
{
stack: main{x<-1> :: match (x) {...}<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp x --->
{
stack: main{alt Ints.None ()<-1> :: match (x) {...}<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.None () with match (x) {...}<1>(alt Ints.None (),) --->
{
stack: main{Ints.One(0 = auto: x)<-1> :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.One(0 = auto: x) --->
{
stack: main{Ints.One<-1> :: Ints.One(0 = auto: x)<0> :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.One --->
{
stack: main{Ints<-1> :: Ints.One<0> :: Ints.One(0 = auto: x)<0> :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue Ints --->
{
stack: main{ptr<3><-1> :: Ints.One<0> :: Ints.One(0 = auto: x)<0> :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<3> with Ints.One<1>(ptr<3>,) --->
{
stack: main{Ints.One<-1> :: Ints.One(0 = auto: x)<0> :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value Ints.One with Ints.One(0 = auto: x)<1>(Ints.One,) --->
{
stack: main{(0 = auto: x)<-1> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp (0 = auto: x) --->
{
stack: main{auto: x<-1> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto: x --->
{
stack: main{auto<-1> :: auto: x<0> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp auto --->
{
stack: main{auto<-1> :: auto: x<0> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto with auto: x<1>(auto,) --->
{
stack: main{auto: x<-1> :: (0 = auto: x)<0> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value auto: x with (0 = auto: x)<1>(auto: x,) --->
{
stack: main{(0 = auto: x@23)<-1> :: Ints.One(0 = auto: x)<1>(Ints.One,) :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value (0 = auto: x@23) with Ints.One(0 = auto: x)<2>(Ints.One,(0 = auto: x@23),) --->
{
stack: main{alt Ints.One (0 = auto: x@24)<-1> :: match (x) {...}<1>(alt Ints.None (),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.One (0 = auto: x@24) with match (x) {...}<2>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) --->
pattern_match(alt Ints.One (0 = auto: x@24), alt Ints.None ())
{
stack: main{Ints.None()<-1> :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.None() --->
{
stack: main{Ints.None<-1> :: Ints.None()<0> :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp Ints.None --->
{
stack: main{Ints<-1> :: Ints.None<0> :: Ints.None()<0> :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue Ints --->
{
stack: main{ptr<3><-1> :: Ints.None<0> :: Ints.None()<0> :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<3> with Ints.None<1>(ptr<3>,) --->
{
stack: main{Ints.None<-1> :: Ints.None()<0> :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value Ints.None with Ints.None()<1>(Ints.None,) --->
{
stack: main{()<-1> :: Ints.None()<1>(Ints.None,) :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp () --->
{
stack: main{()<-1> :: Ints.None()<1>(Ints.None,) :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value () with Ints.None()<2>(Ints.None,(),) --->
{
stack: main{alt Ints.None ()<-1> :: match (x) {...}<3>(alt Ints.None (),alt Ints.One (0 = auto: x@24),) :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value alt Ints.None () with match (x) {...}<4>(alt Ints.None (),alt Ints.One (0 = auto: x@24),alt Ints.None (),) --->
pattern_match(alt Ints.None (), alt Ints.None ())
pattern_match((), ())
{
stack: main{n = (n - 1);<-1> :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt n = (n - 1); --->
{
stack: main{n<-1> :: n = (n - 1);<0> :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step lvalue n --->
{
stack: main{ptr<16><-1> :: n = (n - 1);<0> :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value ptr<16> with n = (n - 1);<1>(ptr<16>,) --->
{
stack: main{(n - 1)<-1> :: n = (n - 1);<1>(ptr<16>,) :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp (n - 1) --->
{
stack: main{n<-1> :: (n - 1)<0> :: n = (n - 1);<1>(ptr<16>,) :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp n --->
{
stack: main{1<-1> :: (n - 1)<0> :: n = (n - 1);<1>(ptr<16>,) :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 1 with (n - 1)<1>(1,) --->
{
stack: main{1<-1> :: (n - 1)<1>(1,) :: n = (n - 1);<1>(ptr<16>,) :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp 1 --->
{
stack: main{1<-1> :: (n - 1)<1>(1,) :: n = (n - 1);<1>(ptr<16>,) :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 1 with (n - 1)<2>(1,1,) --->
{
stack: main{0<-1> :: n = (n - 1);<1>(ptr<16>,) :: {
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 1, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 1, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 0 with n = (n - 1);<2>(ptr<16>,0,) --->
{
stack: main{{
 ... 
}
<0> :: return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt {
 ... 
}
 --->
{
stack: main{return n;<-1>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step stmt return n; --->
{
stack: main{n<-1> :: return n;<0>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- step exp n --->
{
stack: main{0<-1> :: return n;<0>} :: top{}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, alt Ints.None (), Ints.One, 42, 42, 42, alt Ints.One (0 = 42@14), 0, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: n: 0, y: alt Ints.One (0 = 42@14), x: alt Ints.None (), MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
--- handle value 0 with return n;<1>(0,) --->
{
stack: top{0<-1>}
heap: Int, Int, Int, choice Ints, fun<main>, Int, Int, Int, choice MoreInts, Ints.None, !!alt Ints.None !!(), Ints.One, 42, 42, !!42, !!alt Ints.One !!(0 = !!42@14), !!0, Ints.None, Ints.One, auto: x, auto: x, !!42, Ints.One, auto: x, auto: x, Ints.None, 
env: MoreInts: choice MoreInts, main: fun<main>, Ints: choice Ints, 
}
result: 0