Fix issue #1095. Fix some potential NPEs in Parser.java.

src/org/mozilla/javascript/Parser.java

@@ -209,13 +209,19 @@ void addWarning(String messageId, String messageArg, int position, int length) {
             addError(messageId, messageArg, position, length);
         } else if (errorCollector != null) {
             errorCollector.warning(message, sourceURI, position, length);
-        } else {
+        } else if (ts != null) {
             errorReporter.warning(message, sourceURI, ts.getLineno(), ts.getLine(), ts.getOffset());
+        } else {
+            errorReporter.warning(message, sourceURI, 1, "", 1);
         }
     }
 
     void addError(String messageId) {
-        addError(messageId, ts.tokenBeg, ts.tokenEnd - ts.tokenBeg);
+        if (ts == null) {
+            addError(messageId, 0, 0);
+        } else {
+            addError(messageId, ts.tokenBeg, ts.tokenEnd - ts.tokenBeg);
+        }
     }
 
     void addError(String messageId, int position, int length) {
@@ -232,7 +238,7 @@ void addError(String messageId, String messageArg) {
 
     void addError(String messageId, int c) {
         String messageArg = Character.toString((char) c);
-        addError(messageId, messageArg, ts.tokenBeg, ts.tokenEnd - ts.tokenBeg);
+        addError(messageId, messageArg);
     }
 
     void addError(String messageId, String messageArg, int position, int length) {

testsrc/jstests/es6/desctructuring-assignment.js

@@ -0,0 +1,36 @@
+// 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/.
+
+load("testsrc/assert.js");
+
+(function TestSuccessDestructuring() {
+  // var
+  var [a, b] = [1, 2];
+  assertEquals(1, a);
+  assertEquals(2, b);
+
+  // let
+  let [c, d] = [3, 4];
+  assertEquals(3, c);
+  assertEquals(4, d);
+
+  // const
+  const [e, f] = [5, 6];
+  assertEquals(5, e);
+  assertEquals(6, f);
+})();
+
+(function TestDuplicateNameDestructuring() {
+  // var
+  var [a, a] = [1, 2];
+  assertEquals(2, a);
+
+  // let
+  assertThrows("let [b, b] = [3, 4];", TypeError);
+
+  // const
+  assertThrows("const [c, c] = [5, 6];", TypeError);
+})();
+
+"success";

testsrc/org/mozilla/javascript/tests/es6/DestructuringAssignmentTest.java

@@ -0,0 +1,14 @@
+/* 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/. */
+
+package org.mozilla.javascript.tests.es6;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.drivers.LanguageVersion;
+import org.mozilla.javascript.drivers.RhinoTest;
+import org.mozilla.javascript.drivers.ScriptTestsBase;
+
+@RhinoTest("testsrc/jstests/es6/desctructuring-assignment.js")
+@LanguageVersion(Context.VERSION_ES6)
+public class DestructuringAssignmentTest extends ScriptTestsBase {}