1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/bug1275001.js b/js/src/jit-test/tests/debug/bug1275001.js
new file mode 100644
index 0000000000..52e3a1fc0d
--- /dev/null
+++ b/js/src/jit-test/tests/debug/bug1275001.js
@@ -0,0 +1,30 @@
+
+g = newGlobal({newCompartment: true});
+g.parent = this;
+g.eval("(" + function() {
+    Debugger(parent).onExceptionUnwind = function(frame) {
+        frame.older
+    }
+} + ")()")
+function check_one(expected, f, err) {
+    try {
+        f()
+    } catch (ex) {
+        s = ex.message;
+        assertEq(s.includes("undefined"), true);
+    }
+}
+ieval = eval
+function check(expr, expected = expr) {
+    var end, err
+    for ([end, err] of[[".random_prop", ` is undefined` ]]) 
+         statement = "o = {};" + expr + end;
+         cases = [
+            function() { return ieval("var undef;" + statement); },
+            Function(statement)
+        ]
+        for (f of cases) 
+            check_one(expected, f, err)
+}
+check("undef");
+check("o.b");