1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/xdr/delazify-findScript-parameterNames.js b/js/src/jit-test/tests/xdr/delazify-findScript-parameterNames.js
new file mode 100644
index 0000000000..5ee955a40b
--- /dev/null
+++ b/js/src/jit-test/tests/xdr/delazify-findScript-parameterNames.js
@@ -0,0 +1,54 @@
+function testDelazify(i) {
+  var g = newGlobal({ newCompartment: true });
+  var dbg = new Debugger(g);
+
+  dbg.onDebuggerStatement = (frame) => {
+    var allScripts = dbg.findScripts();
+    var j = 0;
+    for (let script of allScripts) {
+      if (i == -1 || i == j) {
+        // Delazify.
+        try {
+          script.parameterNames;
+        } catch (e) {
+        }
+      }
+      j++;
+    }
+  };
+
+  var cache = cacheEntry(`
+function f(
+  a = (
+    b = (
+      c = function g() {
+      },
+    ) => {
+    },
+    d = (
+      e = (
+        f = (
+        ) => {
+        },
+      ) => {
+      },
+    ) => {
+    },
+  ) => {
+  },
+) {
+}
+debugger;
+`);
+
+  evaluate(cache, { global: g, saveIncrementalBytecode: true });
+  evaluate(cache, { global: g, loadBytecode: true });
+}
+
+// Delazify all.
+testDelazify(-1);
+
+// Delazify specific function and its ancestor.
+for (var i = 0; i < 30; i++) {
+  testDelazify(i);
+}