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 // Debugger.Object.prototype.unwrap unwraps Debugger.Objects referring to

 // cross-compartment wrappers.

 var dbg = new Debugger();

 var g1 = newGlobal();

 var dg1 = dbg.addDebuggee(g1);

 assertEq(dg1.unwrap(), dg1);

 var g2 = newGlobal();

 var dg2 = dbg.addDebuggee(g2);

 var dg1g2 = dg1.makeDebuggeeValue(g2);

 assertEq(dg1g2.global, dg1);

 assertEq(dg1g2.unwrap(), dg2);

 // Try an ordinary object, not a global.

 var g2o = g2.Object();

 var dg2o = dg2.makeDebuggeeValue(g2o);

 var dg1g2o = dg1.makeDebuggeeValue(g2o);

 assertEq(dg1g2o.global, dg1);

 assertEq(dg1g2o.unwrap(), dg2o);

 assertEq(dg1g2o.unwrap().unwrap(), dg2o);