Support destructuring bindings as catch variables. (#3399)

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/es2015/try-pattern.js

@@ -0,0 +1,73 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+function check_syntax_error(code)
+{
+  try {
+    eval(code);
+    assert(false);
+  } catch (e) {
+    assert(e instanceof SyntaxError);
+  }
+}
+
+check_syntax_error("try {} catch() {}");
+check_syntax_error("try {} catch([a] {}");
+check_syntax_error("try {} catch([a] = [1]) {}");
+check_syntax_error("try {} catch({a} = {a:1}) {}");
+check_syntax_error("try {} catch(a,) {}");
+
+try {
+  throw [1,2]
+  assert(false)
+} catch ([a, b]) {
+  assert(a === 1)
+  assert(b === 2)
+}
+
+try {
+  throw { x:1, y:2 }
+  assert(false)
+} catch ({x, 'y':b}) {
+  assert(x === 1)
+  assert(b === 2)
+}
+
+try {
+  throw [1,2]
+  assert(false)
+} catch ([a, b]) {
+  eval("assert(a === 1)")
+  eval("assert(b === 2)")
+}
+
+try {
+  throw { x:1, y:2 }
+  assert(false)
+} catch ({x, 'y':b}) {
+  eval("assert(x === 1)")
+  eval("assert(b === 2)")
+}
+
+try {
+  try {
+    throw []
+    assert(false)
+  } catch ([a = b, b]) {
+    assert(false)
+  }
+} catch (e) {
+  assert(e instanceof ReferenceError)
+}