Checks that setScriptSource fails for editing functions that are below the top-most frame on the stack
Paused at (before live edit):
function foo(b) {
  #debugger;
  return b + 25;

Debugger.setScriptSource result:
{
    status : BlockedByActiveFunction
}
Evaluation result:
{
    description : 33
    type : number
    value : 33
}