The Tor Browser / file revision

 // getColumnOffsets correctly places the various parts of a ForStatement.

 var global = newGlobal();

 Debugger(global).onDebuggerStatement = function (frame) {

     var script = frame.eval("f").return.script;

     script.getAllColumnOffsets().forEach(function (offset) {

         script.setBreakpoint(offset.offset, {

             hit: function (frame) {

                 assertEq(offset.lineNumber, 1);

                 global.log += offset.columnNumber + " ";

             }

         });

     });

 };

 global.log = '';

 global.eval("function f(n) { for (var i = 0; i < n; ++i) log += '. '; log += '! '; } debugger;");

 global.f(3);

 assertEq(global.log, "25 32 44 . 39 32 44 . 39 32 44 . 39 32 57 ! 69 ");