1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/bug1263899.js b/js/src/jit-test/tests/debug/bug1263899.js
new file mode 100644
index 000000000..89f121e83
--- /dev/null
+++ b/js/src/jit-test/tests/debug/bug1263899.js
@@ -0,0 +1,29 @@
+try {
+  evaluate(` 
+    function runTestCase() $ERROR()
+    function $ERROR() {
+      throw Error
+    }
+    Object.defineProperty(this, "x", { value: 0 });
+    setJitCompilerOption("ion.warmup.trigger", 0)
+  `)
+  evaluate(`function f() {} f(x)`)
+  runTestCase()
+} catch (exc) {}
+evaluate(`
+  g = newGlobal()
+  g.parent = this
+  g.eval("(" + function() {
+    Debugger(parent).onExceptionUnwind = function(frame) {
+      frame.older
+    }
+  } + ")()")
+  try { $ERROR() } catch(e){}
+`)
+try {
+evaluate(`
+  x ^= null;
+  if (x = 1)
+    $ERROR()
+`);
+} catch(e) {}