Fix evaluation order in non-binding destructuring patterns (#4173)

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/es.next/array-pattern.js

@@ -281,6 +281,54 @@ function __createIterableObject (arr, methods) {
   assert (b === 2);
 }) ();
 
+(function () {
+  var value = { y: "42" };
+  var x = {};
+  var assignmentResult, iterationResult, iter;
+
+  iter = (function*() {
+    assignmentResult = { y: x[yield] } = value;
+  }());
+
+  iterationResult = iter.next();
+
+  assert (assignmentResult === undefined);
+  assert (iterationResult.value === undefined);
+  assert (iterationResult.done === false);
+  assert (x.prop === undefined);
+
+  iterationResult = iter.next('prop');
+
+  assert (assignmentResult === value);
+  assert (iterationResult.value === undefined);
+  assert (iterationResult.done === true);
+  assert (x.prop === "42");
+}) ();
+
+(function () {
+  var value = { foo: "42" };
+  var x = {};
+  var assignmentResult, iterationResult, iter;
+
+  iter = (function*() {
+    assignmentResult = { ['f' + 'o' + 'o']: x[yield] } = value;
+  }());
+
+  iterationResult = iter.next();
+
+  assert (assignmentResult === undefined);
+  assert (iterationResult.value === undefined);
+  assert (iterationResult.done === false);
+  assert (x.prop === undefined);
+
+  iterationResult = iter.next('prop');
+
+  assert (assignmentResult === value);
+  assert (iterationResult.value === undefined);
+  assert (iterationResult.done === true);
+  assert (x.prop === "42");
+}) ();
+
 mustThrow ("var iter = __createIterableObject([], "
            + "{ get 'return'() { throw new TypeError() }});"
            + "var [a] = iter");