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

lib/compiler/implementation/compiler.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.
 
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
 const bool REPORT_EXCESS_RESOLUTION = false;
@@ skipping 92 matching lines @@
    * libraries.
    */
   ClassElement jsIndexingBehaviorInterface;
 
   Element get currentElement => _currentElement;
   withCurrentElement(Element element, f()) {
     Element old = currentElement;
     _currentElement = element;
     try {
       return f();
-    } catch (CompilerCancelledException ex) {
+    } on CompilerCancelledException catch (ex) {
       throw;
-    } catch (StackOverflowException ex) {
+    } on StackOverflowException catch (ex) {
       // We cannot report anything useful in this case, because we
       // do not have enough stack space.
       throw;
-    } catch (var ex) {
+    } catch (ex) {
       try {
         unhandledExceptionOnElement(element);
-      } catch (var doubleFault) {
+      } catch (doubleFault) {
         // Ignoring exceptions in exception handling.
       }
       throw;
     } finally {
       _currentElement = old;
     }
   }
 
   List<CompilerTask> tasks;
   ScannerTask scanner;
@@ skipping 124 matching lines @@
     });
   }
 
   void log(message) {
     reportDiagnostic(null, message, api.Diagnostic.VERBOSE_INFO);
   }
 
   bool run(Uri uri) {
     try {
       runCompiler(uri);
-    } catch (CompilerCancelledException exception) {
+    } on CompilerCancelledException catch (exception) {
       log(exception.toString());
       log('compilation failed');
       return false;
     }
     tracer.close();
     log('compilation succeeded');
     return true;
   }
 
   void enableNoSuchMethod(Element element) {
@@ skipping 616 matching lines @@
     final endOffset = end.charOffset + end.slowCharCount;
 
     // [begin] and [end] might be the same for the same empty token. This
     // happens for instance when scanning '$$'.
     assert(endOffset >= beginOffset);
     return f(beginOffset, endOffset);
   }
 
   String toString() => 'SourceSpan($uri, $begin, $end)';
 }