diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/code_math.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/code_math.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+function add(a, b, k) {
+  var result = a + b;
+  return k(result);
+}
+
+function sub(a, b, k) {
+  var result = a - b;
+  return k(result);
+}
+
+function mul(a, b, k) {
+  var result = a * b;
+  return k(result);
+}
+
+function div(a, b, k) {
+  var result = a / b;
+  return k(result);
+}
+
+function arithmetic() {
+  add(4, 4, function (a) {
+    // 8
+    sub(a, 2, function (b) {
+      // 6
+      mul(b, 3, function (c) {
+        // 18
+        div(c, 2, function (d) {
+          // 9
+          console.log(d);
+        });
+      });
+    });
+  });
+}
+
+// Compile with closure compiler and the following flags:
+//
+//     --compilation_level WHITESPACE_ONLY
+//     --source_map_format V3
+//     --create_source_map code_math.map
+//     --js_output_file    code_math.min.js
+//
+// And then append the sourceMappingURL comment directive to code_math.min.js
+// manually.