********** source program **********
var Int : x = y
var Int : y = 0
fn main () -> Int {
return x;

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

********** type checking complete **********
var Int : x = y
var Int : y = 0
fn main () -> Int {
return x;
}
********** starting execution **********
********** initializing globals **********
--- step exp y --->
8: could not find `y`
EXIT CODE: 255