1 files changed, 90 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/object-rest.js b/js/src/jit-test/tests/basic/object-rest.js
new file mode 100644
index 0000000000..b8fb8102ad
--- /dev/null
+++ b/js/src/jit-test/tests/basic/object-rest.js
@@ -0,0 +1,90 @@
+function test() {
+    var from, to;
+
+    // From values.
+    from = {x: 1, y: 2};
+    ({...to} = from);
+    assertEq(to.y, 2);
+
+    var z;
+    from = {x: 1, y: 2};
+    ({x: z, ...to} = from);
+    assertEq(z, 1);
+    assertEq(to.y, 2);
+
+    // From getter.
+    var c = 7;
+    from = {x: 1, get y() { return ++c; }};
+    ({...to} = from);
+    assertEq(c, 8);
+    assertEq(to.y, 8);
+
+    from = {x: 1, get y() { return ++c; }};
+    ({y: z, ...to} = from);
+    assertEq(c, 9);
+    assertEq(z, 9);
+    assertEq(to.y, undefined);
+
+    // Array with dense elements.
+    from = [1, 2, 3];
+    ({...to} = from);
+    assertEq(to[2], 3);
+    assertEq("length" in to, false);
+
+    from = [1, 2, 3];
+    ({2: z, ...to} = from);
+    assertEq(z, 3);
+    assertEq(to[2], undefined);
+    assertEq(to[0], 1);
+    assertEq("length" in to, false);
+
+    // Object with sparse elements and symbols.
+    from = {x: 1, 1234567: 2, 1234560: 3, [Symbol.iterator]: 5, z: 3};
+    ({...to} = from);
+    assertEq(to[1234567], 2);
+    assertEq(Object.keys(to).toString(), "1234560,1234567,x,z");
+    assertEq(to[Symbol.iterator], 5);
+
+    from = {x: 1, 1234567: 2, 1234560: 3, [Symbol.iterator]: 5, z: 3};
+    ({[Symbol.iterator]: z, ...to} = from);
+    assertEq(to[1234567], 2);
+    assertEq(Object.keys(to).toString(), "1234560,1234567,x,z");
+    assertEq(to[Symbol.iterator], undefined);
+    assertEq(z, 5);
+
+    // Typed array.
+    from = new Int32Array([1, 2, 3]);
+    ({...to} = from);
+    assertEq(to[1], 2);
+
+    from = new Int32Array([1, 2, 3]);
+    ({1: z, ...to} = from);
+    assertEq(z, 2);
+    assertEq(to[1], undefined);
+    assertEq(to[2], 3);
+
+    // Primitive string.
+    from = "foo";
+    ({...to} = from);
+    assertEq(to[0], "f");
+
+    from = "foo";
+    ({0: z, ...to} = from);
+    assertEq(z, "f");
+    assertEq(to[0], undefined);
+    assertEq(to[1], "o");
+
+    // String object.
+    from = new String("bar");
+    ({...to} = from);
+    assertEq(to[2], "r");
+
+    from = new String("bar");
+    ({1: z, ...to} = from);
+    assertEq(z, "a");
+    assertEq(to[1], undefined);
+    assertEq(to[2], "r");
+}
+test();
+test();
+test();