Bug 1204562 - GetMethod should not box the receiver argument. r=till

js/src/builtin/Utilities.js

@@ -111,23 +111,23 @@ function SameValueZero(x, y) {
     return x === y || (x !== x && y !== y);
 }
 
-/* Spec: ECMAScript Draft, 6th edition Dec 24, 2014, 7.3.8 */
-function GetMethod(O, P) {
+// ES 2017 draft (April 6, 2016) 7.3.9
+function GetMethod(V, P) {
     // Step 1.
     assert(IsPropertyKey(P), "Invalid property key");
 
-    // Steps 2-3.
-    var func = ToObject(O)[P];
+    // Step 2.
+    var func = V[P];
 
-    // Step 4.
+    // Step 3.
     if (func === undefined || func === null)
         return undefined;
 
-    // Step 5.
+    // Step 4.
     if (!IsCallable(func))
         ThrowTypeError(JSMSG_NOT_FUNCTION, typeof func);
 
-    // Step 6.
+    // Step 5.
     return func;
 }
 

js/src/tests/ecma_6/Array/from_primitive.js

@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+for (let primitive of [true, 3.14, "hello", Symbol()]) {
+    let prototype = Object.getPrototypeOf(primitive);
+
+    Object.defineProperty(prototype, Symbol.iterator, {
+        configurable: true,
+        get() {
+            "use strict";
+            assertEq(this, primitive);
+            return () => [this][Symbol.iterator]();
+        },
+    });
+    assertEq(Array.from(primitive)[0], primitive);
+
+    delete prototype[Symbol.iterator];
+}
+
+if (typeof reportCompare === 'function')
+    reportCompare(0, 0);