src/third_party/mozjs-45/js/src/jit-test/tests/debug/Debugger-debuggees-14.js

// Adding a debuggee in a compartment that is already in debug mode works
// even if a script from that compartment is on the stack.

var g = newGlobal();
var dbg1 = Debugger(g);
var dbg2 = Debugger();
g.parent = this;
g.eval("parent.dbg2.addDebuggee(this);");