1 files changed, 17 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arguments/bug1621265.js b/js/src/jit-test/tests/arguments/bug1621265.js
new file mode 100644
index 0000000000..8eaf37c480
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/bug1621265.js
@@ -0,0 +1,17 @@
+// |jit-test| error:null
+
+function f(a) {
+  // Add |arguments[0]| to mark the function as having an arguments
+  // access. Even though there's a |JSOp::SetArg| bytecode is present, we can
+  // still use lazy arguments here, because the |JSOp::SetArg| bytecode is
+  // always unreachable.
+  var v = arguments[0];
+  assertEq(v, 1);
+
+  // Anything below the |throw| is unreachable.
+  throw null;
+
+  // Add an unreachable |JSOp::SetArg| bytecode.
+  a = 4;
+}
+f(1);