examples/scope3.av

## examples/scope3.av

let a = 1;
{
  a = 2;
  let a = 3;
  b = 4;
  {
    a = 5;
    b = 6;
    let c = 7;
    println("a in scope2:" + a);
    println("b in scope2:" + b);
    println("c in scope2:" + c);
  }
  println("a in scope1:" + a);
  println("b in scope1:" + b);
  println("c in scope1:" + c);
}

println("a in global scope:" + a);
println("b in global scope:" + b);
println("c in global scope:" + c);