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var y: int;
var x: int;
procedure {:inline 1} bar() returns (b: bool)
modifies y;
{
if (b) {
y := y + 1;
} else {
y := y - 1;
}
}
procedure {:inline 1} foo()
modifies x, y;
{
var b: bool;
call b := bar();
if (b) {
x := x + 1;
} else {
x := x - 1;
}
}
procedure main() returns (b: bool)
requires x == y;
ensures !b ==> x == y+1;
ensures b ==> x+1 == y;
modifies x, y;
modifies y;
{
call foo();
assert x == y;
call b := bar();
}
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