src/third_party/mozjs-45/js/src/jit-test/tests/debug/gc-06.js

// Debugger objects do not keep debuggee globals live.
var dbg = new Debugger;
for (var i = 0; i < 10; i++)
    dbg.addDebuggee(newGlobal());
gc();
assertEq(dbg.getDebuggees().length < 10, true);