michael@0: // The value of frame.environment is the same Environment object at different
michael@0: // times within a single visit to a scope.
michael@0: 
michael@0: var g = newGlobal();
michael@0: var dbg = Debugger(g);
michael@0: g.eval("function h() { debugger; }");
michael@0: var hits, env;
michael@0: dbg.onDebuggerStatement = function (hframe) {
michael@0:     var frame = hframe.older;
michael@0:     var e = frame.environment;
michael@0: 
michael@0:     // frame.environment is at least cached from one moment to the next.
michael@0:     assertEq(e, frame.environment);
michael@0: 
michael@0:     // frame.environment is cached from statement to statement within a call frame.
michael@0:     if (env === undefined)
michael@0:         env = e;
michael@0:     else
michael@0:         assertEq(e, env);
michael@0: 
michael@0:     hits++;
michael@0: };
michael@0: 
michael@0: hits = 0;
michael@0: env = undefined;
michael@0: g.eval("function f() { (function () { var i = 0; h(); var j = 2; h(); })(); }");
michael@0: g.f();
michael@0: assertEq(hits, 2);
michael@0: 
michael@0: hits = 0;
michael@0: env = undefined;
michael@0: g.eval("function f2() { { let i = 0; h(); let j = 2; h(); } }");
michael@0: g.f2();
michael@0: assertEq(hits, 2);
michael@0: 
michael@0: hits = 0;
michael@0: env = undefined;
michael@0: g.eval("function f3() { { let i; for (i = 0; i < 2; i++) h(); } }");
michael@0: g.f3();
michael@0: assertEq(hits, 2);