1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Environment-getVariable-15.js b/js/src/jit-test/tests/debug/Environment-getVariable-15.js
new file mode 100644
index 0000000000..f0495cda17
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Environment-getVariable-15.js
@@ -0,0 +1,31 @@
+// Don't hand out internal function objects via Debugger.Environment.prototype.getVariable.
+
+// When the real scope chain object holding the binding for 'f' in 'function f()
+// { ... }' is optimized out because it's never used, we whip up fake scope
+// chain objects for Debugger to use, if it looks. However, the value of the
+// variable f will be an internal function object, not a live function object,
+// since the latter was not recorded. Internal function objects should not be
+// exposed via Debugger.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger(g);
+
+dbg.onDebuggerStatement = function (frame) {
+  var g_call_env = frame.older.environment;     // g's locals
+  var g_decl_env = g_call_env.parent;           // 'function g' binding
+  var f_call_env = g_decl_env.parent;           // f's locals
+  var f_decl_env = f_call_env.parent;           // 'function f' binding
+  assertEq(f_decl_env.getVariable('f').optimizedOut, true);
+}
+
+g.evaluate(`
+
+           function h() { debugger; }
+           (function f() {
+             return function g() {
+               h();
+               return 1;
+             }
+           })()();
+
+           `);