[es6] Implement destructuring binding in try/catch

src/preparser.cc

Index: src/preparser.cc
diff --git a/src/preparser.cc b/src/preparser.cc
index 74e11b1d454b3b33a3f6bcadb18f91476a246f37..b52cca20dd857c4a35d801c6b191fc8a47a5118f 100644
--- a/src/preparser.cc
+++ b/src/preparser.cc
@@ -1029,9 +1029,12 @@ PreParser::Statement PreParser::ParseTryStatement(bool* ok) {
   if (tok == Token::CATCH) {
     Consume(Token::CATCH);
     Expect(Token::LPAREN, CHECK_OK);
-    ParseIdentifier(kDontAllowRestrictedIdentifiers, CHECK_OK);
+    ExpressionClassifier pattern_classifier;
+    ParsePrimaryExpression(&pattern_classifier, CHECK_OK);
+    ValidateBindingPattern(&pattern_classifier, CHECK_OK);
     Expect(Token::RPAREN, CHECK_OK);
     {
+      // TODO(adamk): Make this CATCH_SCOPE
       Scope* with_scope = NewScope(scope_, WITH_SCOPE);
       BlockState block_state(&scope_, with_scope);
       ParseBlock(CHECK_OK);