Update corelib/ and lib/ to use the new try-catch syntax.

lib/compiler/implementation/tree/nodes.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitBreakStatement(BreakStatement node);
   R visitCascade(Cascade node);
   R visitCascadeReceiver(CascadeReceiver node);
   R visitCaseMatch(CaseMatch node);
@@ skipping 96 matching lines @@
   toDebugString() {
     return PrettyPrinter.prettyPrint(this);
   }
 
   String getObjectDescription() => super.toString();
 
   String unparse() {
     Unparser unparser = new Unparser();
     try {
       return unparser.unparse(this);
-    } catch (var e, var trace) {
+    } catch (e, trace) {
       print(trace);
       return '<<unparse error: ${getObjectDescription()}: ${unparser.sb}>>';
     }
   }
 
   abstract Token getBeginToken();
 
   abstract Token getEndToken();
 
   Block asBlock() => null;
@@ skipping 530 matching lines @@
 class LiteralInt extends Literal<int> {
   LiteralInt(Token token, DecodeErrorHandler handler) : super(token, handler);
 
   LiteralInt asLiteralInt() => this;
 
   int get value {
     try {
       Token valueToken = token;
       if (valueToken.kind === PLUS_TOKEN) valueToken = valueToken.next;
       return parseInt(valueToken.value.slowToString());
-    } catch (FormatException ex) {
+    } on FormatException catch (ex) {
       (this.handler)(token, ex);
     }
   }
 
   accept(Visitor visitor) => visitor.visitLiteralInt(this);
 }
 
 class LiteralDouble extends Literal<double> {
   LiteralDouble(Token token, DecodeErrorHandler handler)
     : super(token, handler);
 
   LiteralDouble asLiteralDouble() => this;
 
   double get value {
     try {
       Token valueToken = token;
       if (valueToken.kind === PLUS_TOKEN) valueToken = valueToken.next;
       return parseDouble(valueToken.value.slowToString());
-    } catch (FormatException ex) {
+    } on FormatException catch (ex) {
       (this.handler)(token, ex);
     }
   }
 
   accept(Visitor visitor) => visitor.visitLiteralDouble(this);
 }
 
 class LiteralBool extends Literal<bool> {
   LiteralBool(Token token, DecodeErrorHandler handler) : super(token, handler);
 
@@ skipping 1063 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send !== null) return f(send.arguments.head);
 }