Improve exception handling:

dart/frog/leg/emitter.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.
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
 class ClosureInvocationElement extends FunctionElement {
   ClosureInvocationElement(SourceString name,
@@ skipping 152 matching lines @@
   }
 
   void addInstanceMember(Element member,
                          String prototype,
                          StringBuffer buffer) {
     assert(member.isInstanceMember());
     if (member.kind === ElementKind.FUNCTION
         || member.kind === ElementKind.GENERATIVE_CONSTRUCTOR_BODY
         || member.kind === ElementKind.GETTER
         || member.kind === ElementKind.SETTER) {
+      if (member.modifiers !== null && member.modifiers.isAbstract()) return;
       String codeBlock = compiler.universe.generatedCode[member];
       if (codeBlock == null) return;
       buffer.add('$prototype.${namer.getName(member)} = $codeBlock;\n');
       codeBlock = compiler.universe.generatedBailoutCode[member];
       if (codeBlock !== null) {
         String name = namer.getBailoutName(member);
         buffer.add('$prototype.$name = $codeBlock;\n');
       }
       FunctionElement function = member;
       if (!function.computeParameters(compiler).optionalParameters.isEmpty()) {
         addParameterStubs(member, (name) => '$prototype.$name', buffer);
       }
     } else if (member.kind === ElementKind.FIELD) {
       // TODO(ngeoffray): Have another class generate the code for the
       // fields.
-      if (compiler.universe.invokedSetters.contains(member.name)) {
+      if ((member.modifiers === null || !member.modifiers.isFinal()) &&
+          compiler.universe.invokedSetters.contains(member.name)) {
         String setterName = namer.setterName(member.name);
         buffer.add('$prototype.$setterName = function(v){\n' +
           '  this.${namer.getName(member)} = v;\n};\n');
       }
       if (compiler.universe.invokedGetters.contains(member.name)) {
         String getterName = namer.getterName(member.name);
         buffer.add('$prototype.$getterName = function(){\n' +
           '  return this.${namer.getName(member)};\n};\n');
       }
     } else {
@@ skipping 407 matching lines @@
       emitCompileTimeConstants(buffer);
       emitStaticFinalFieldInitializations(buffer);
       buffer.add('var ${namer.CURRENT_ISOLATE} = new ${namer.ISOLATE}();\n');
       Element main = compiler.mainApp.find(Compiler.MAIN);
       buffer.add('${namer.isolateAccess(main)}();\n');
       compiler.assembledCode = buffer.toString();
     });
     return compiler.assembledCode;
   }
 }