1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/error-cause-not-copied-when-redefined-to-accessor.js b/js/src/jit-test/tests/debug/error-cause-not-copied-when-redefined-to-accessor.js
new file mode 100644
index 0000000000..a5f089217e
--- /dev/null
+++ b/js/src/jit-test/tests/debug/error-cause-not-copied-when-redefined-to-accessor.js
@@ -0,0 +1,35 @@
+// Test that the ErrorCopier doesn't copy the optional "cause" property when it
+// has been redefined to an accessor property.
+
+var g = newGlobal({newCompartment: true});
+
+var obj = g.eval(`
+new Proxy({}, {
+  isExtensible() {
+    // Create an error object with an initial cause.
+    let error = new Error("message", {cause: "initial cause"});
+
+    // Ensure the "cause" property is correctly installed.
+    assertEq(error.cause, "initial cause");
+
+    // Redefine the "cause" data property to an accessor property.
+    Object.defineProperty(error, "cause", { get() {} });
+
+    // Throw the error.
+    throw error;
+  }
+});
+`);
+
+var dbg = new Debugger();
+var gw = dbg.addDebuggee(g);
+var objw = gw.makeDebuggeeValue(obj);
+
+var err;
+try {
+  objw.isExtensible();
+} catch (e) {
+  err = e;
+}
+
+assertEq(err.cause, undefined);