michael@0: // Check marking through the keys of a Map.
michael@0: 
michael@0: load(libdir + "referencesVia.js");
michael@0: 
michael@0: var m = new Map;
michael@0: for (var i = 0; i < 20; i++) {
michael@0:     var n = new Map;
michael@0:     n.set(m, i);
michael@0:     assertEq(referencesVia(n, 'key', m), true);
michael@0:     m = n;
michael@0: }
michael@0: 
michael@0: gc();
michael@0: gc();
michael@0: 
michael@0: // TODO: walk the chain using for-of to make sure everything is still there