********** source program **********
struct Point {
var x : Int;
var y : Int;
}
fn main () -> Int {
var auto: p = Point(x = 1, y = 2);
return ((p.y - p.x) - 1);

}
********** type checking **********
--- step exp Int --->
--- step exp Int --->
--- step exp Int --->
--- step exp Int --->
--- step exp auto --->

********** type checking complete **********
struct Point {
var x : Int;
var y : Int;
}
fn main () -> Int {
var auto: p = Point(x = 1, y = 2);
return ((p.y - p.x) - 1);
}
********** starting execution **********
********** initializing globals **********
--- step exp Int --->
--- step exp Int --->
--- step exp () --->
********** calling main function **********
{
stack: top{main()<-1>}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp main() --->
{
stack: top{main<-1> :: main()<0>}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp main --->
{
stack: top{fun<main><-1> :: main()<0>}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value fun<main> with main()<1>(fun<main>,) --->
{
stack: top{()<-1> :: main()<1>(fun<main>,)}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp () --->
{
stack: top{()<-1> :: main()<1>(fun<main>,)}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value () with main()<2>(fun<main>,(),) --->
pattern_match((), ())
{
stack: main{var auto: p = Point(x = 1, y = 2); ... <-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step stmt var auto: p = Point(x = 1, y = 2); ...  --->
{
stack: main{var auto: p = Point(x = 1, y = 2);<-1> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step stmt var auto: p = Point(x = 1, y = 2); --->
{
stack: main{Point(x = 1, y = 2)<-1> :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp Point(x = 1, y = 2) --->
{
stack: main{Point<-1> :: Point(x = 1, y = 2)<0> :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp Point --->
{
stack: main{struct Point<-1> :: Point(x = 1, y = 2)<0> :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value struct Point with Point(x = 1, y = 2)<1>(struct Point,) --->
{
stack: main{(x = 1, y = 2)<-1> :: Point(x = 1, y = 2)<1>(struct Point,) :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp (x = 1, y = 2) --->
{
stack: main{1<-1> :: (x = 1, y = 2)<0> :: Point(x = 1, y = 2)<1>(struct Point,) :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp 1 --->
{
stack: main{1<-1> :: (x = 1, y = 2)<0> :: Point(x = 1, y = 2)<1>(struct Point,) :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value 1 with (x = 1, y = 2)<1>(1,) --->
{
stack: main{2<-1> :: (x = 1, y = 2)<1>(1,) :: Point(x = 1, y = 2)<1>(struct Point,) :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp 2 --->
{
stack: main{2<-1> :: (x = 1, y = 2)<1>(1,) :: Point(x = 1, y = 2)<1>(struct Point,) :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value 2 with (x = 1, y = 2)<2>(1,2,) --->
{
stack: main{(x = 1@2, y = 2@3)<-1> :: Point(x = 1, y = 2)<1>(struct Point,) :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value (x = 1@2, y = 2@3) with Point(x = 1, y = 2)<2>(struct Point,(x = 1@2, y = 2@3),) --->
{
stack: main{Point(x = 1@4, y = 2@5)<-1> :: var auto: p = Point(x = 1, y = 2);<0> :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value Point(x = 1@4, y = 2@5) with var auto: p = Point(x = 1, y = 2);<1>(Point(x = 1@4, y = 2@5),) --->
{
stack: main{auto: p<-1> :: var auto: p = Point(x = 1, y = 2);<1>(Point(x = 1@4, y = 2@5),) :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp auto: p --->
{
stack: main{auto<-1> :: auto: p<0> :: var auto: p = Point(x = 1, y = 2);<1>(Point(x = 1@4, y = 2@5),) :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 
env: main: fun<main>, Point: struct Point, 
}
--- step exp auto --->
{
stack: main{auto<-1> :: auto: p<0> :: var auto: p = Point(x = 1, y = 2);<1>(Point(x = 1@4, y = 2@5),) :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value auto with auto: p<1>(auto,) --->
{
stack: main{auto: p<-1> :: var auto: p = Point(x = 1, y = 2);<1>(Point(x = 1@4, y = 2@5),) :: return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 
env: main: fun<main>, Point: struct Point, 
}
--- handle value auto: p with var auto: p = Point(x = 1, y = 2);<2>(Point(x = 1@4, y = 2@5),auto: p,) --->
pattern_match(auto: p, Point(x = 1@4, y = 2@5))
{
stack: main{return ((p.y - p.x) - 1);<-1>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step stmt return ((p.y - p.x) - 1); --->
{
stack: main{((p.y - p.x) - 1)<-1> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step exp ((p.y - p.x) - 1) --->
{
stack: main{(p.y - p.x)<-1> :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step exp (p.y - p.x) --->
{
stack: main{p.y<-1> :: (p.y - p.x)<0> :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step exp p.y --->
{
stack: main{p<-1> :: p.y<0> :: (p.y - p.x)<0> :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step lvalue p --->
{
stack: main{ptr<8><-1> :: p.y<0> :: (p.y - p.x)<0> :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value ptr<8> with p.y<1>(ptr<8>,) --->
{
stack: main{2<-1> :: (p.y - p.x)<0> :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value 2 with (p.y - p.x)<1>(2,) --->
{
stack: main{p.x<-1> :: (p.y - p.x)<1>(2,) :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step exp p.x --->
{
stack: main{p<-1> :: p.x<0> :: (p.y - p.x)<1>(2,) :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step lvalue p --->
{
stack: main{ptr<8><-1> :: p.x<0> :: (p.y - p.x)<1>(2,) :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value ptr<8> with p.x<1>(ptr<8>,) --->
{
stack: main{1<-1> :: (p.y - p.x)<1>(2,) :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value 1 with (p.y - p.x)<2>(2,1,) --->
{
stack: main{1<-1> :: ((p.y - p.x) - 1)<0> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value 1 with ((p.y - p.x) - 1)<1>(1,) --->
{
stack: main{1<-1> :: ((p.y - p.x) - 1)<1>(1,) :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- step exp 1 --->
{
stack: main{1<-1> :: ((p.y - p.x) - 1)<1>(1,) :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value 1 with ((p.y - p.x) - 1)<2>(1,1,) --->
{
stack: main{0<-1> :: return ((p.y - p.x) - 1);<0>} :: top{}
heap: struct Point, fun<main>, 1, 2, 1, 2, 1, 2, Point(x = 1@6, y = 2@7), 
env: p: Point(x = 1@6, y = 2@7), main: fun<main>, Point: struct Point, 
}
--- handle value 0 with return ((p.y - p.x) - 1);<1>(0,) --->
{
stack: top{0<-1>}
heap: struct Point, fun<main>, 1, 2, 1, 2, !!1, !!2, !!Point!!(x = !!1@6, y = !!2@7), 
env: main: fun<main>, Point: struct Point, 
}
result: 0