1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/optimized-out-03.js b/js/src/jit-test/tests/debug/optimized-out-03.js
new file mode 100644
index 0000000000..aada963326
--- /dev/null
+++ b/js/src/jit-test/tests/debug/optimized-out-03.js
@@ -0,0 +1,31 @@
+// Test that eval-in-frame throws on accessing optimized out values.
+
+load(libdir + "jitopts.js");
+
+if (!jitTogglesMatch(Opts_IonEagerNoOffthreadCompilation))
+  quit(0);
+
+withJitOptions(Opts_IonEagerNoOffthreadCompilation, function() {
+  var dbgGlobal = newGlobal({newCompartment: true});
+  var dbg = new dbgGlobal.Debugger();
+  dbg.addDebuggee(this);
+
+  function f() {
+    assertEq(dbg.getNewestFrame().older.eval("print(a)").throw.unsafeDereference().toString(),
+             "Error: variable 'a' has been optimized out");
+  }
+
+  // Test optimized out binding in function scope.
+  (function () {
+    var a = 1;
+    for (var i = 0; i < 1; i++) { f(); a = 2; }
+  })();
+
+  // Test optimized out binding in block scope.
+  (function () {
+    {
+      let a = 1;
+      for (var i = 0; i < 1; i++) { f(); a = 2; }
+    }
+  })();
+});