src/third_party/mozjs-45/js/src/jit-test/tests/debug/Environment-setVariable-02.js

// The argument to setVariable can be a Debugger.Object.

var g = newGlobal();
var dbg = new Debugger;
var gw = dbg.addDebuggee(g);
dbg.onDebuggerStatement = function (frame) {
    frame.environment.parent.parent.setVariable("x", gw);
};
g.eval("var x = 1; debugger;");
assertEq(g.x, g);