Add m-esr52 at 52.6.0

1 files changed, 45 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Destructuring/rest-with-trailing-comma.js b/js/src/tests/ecma_6/Destructuring/rest-with-trailing-comma.js
new file mode 100644
index 000000000..310180e14
--- /dev/null
+++ b/js/src/tests/ecma_6/Destructuring/rest-with-trailing-comma.js
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const invalidSyntax = [
+    "[...r, ]",
+    "[a, ...r, ]",
+    "[a = 0, ...r, ]",
+    "[[], ...r, ]",
+    "[[...r,]]",
+    "[[...r,], ]",
+    "[[...r,], a]",
+];
+
+const validSyntax = [
+    "[, ]",
+    "[a, ]",
+    "[[], ]",
+];
+
+const destructuringForms = [
+    a => `${a} = [];`,
+    a => `var ${a} = [];`,
+    a => `let ${a} = [];`,
+    a => `const ${a} = [];`,
+    a => `(${a}) => {};`,
+    a => `(${a} = []) => {};`,
+    a => `function f(${a}) {}`,
+];
+
+for (let invalid of invalidSyntax) {
+    for (let fn of destructuringForms) {
+        assertThrowsInstanceOf(() => Function(fn(invalid)), SyntaxError);
+    }
+}
+
+for (let invalid of validSyntax) {
+    for (let fn of destructuringForms) {
+        Function(fn(invalid));
+    }
+}
+
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);