Fix some warnings.

lib/compiler/implementation/ssa/builder.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.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 166 matching lines @@
       ElementKind kind = element.kind;
       if (kind === ElementKind.GENERATIVE_CONSTRUCTOR) {
         graph = compileConstructor(builder, work);
       } else if (kind === ElementKind.GENERATIVE_CONSTRUCTOR_BODY ||
                  kind === ElementKind.FUNCTION ||
                  kind === ElementKind.GETTER ||
                  kind === ElementKind.SETTER) {
         graph = builder.buildMethod(element);
       } else if (kind === ElementKind.FIELD) {
         graph = builder.buildLazyInitializer(element);
+      } else {
+        compiler.internalErrorOnElement(element,
+                                        'unexpected element kind $kind');
       }
       assert(graph.isValid());
       if (kind !== ElementKind.FIELD) {
         bool inLoop = functionsCalledInLoop.contains(element.declaration);
         if (!inLoop) {
           Selector selector = selectorsCalledInLoop[element.name];
           inLoop = selector !== null && selector.applies(element, compiler);
         }
         graph.calledInLoop = inLoop;
 
         // If there is an estimate of the parameter types assume these types
         // when compiling.
+        // TODO(karlklose,ngeoffray): add a check to make sure that element is
+        // of type FunctionElement.
+        FunctionElement function = element;
         OptionalParameterTypes defaultValueTypes = null;
-        FunctionSignature signature = element.computeSignature(compiler);
+        FunctionSignature signature = function.computeSignature(compiler);
         if (signature.optionalParameterCount > 0) {
           defaultValueTypes =
               new OptionalParameterTypes(signature.optionalParameterCount);
           int index = 0;
           signature.forEachOptionalParameter((Element parameter) {
             Constant defaultValue = compiler.compileVariable(parameter);
             HType type = HGraph.mapConstantTypeToSsaType(defaultValue);
             defaultValueTypes.update(index, parameter.name, type);
             index++;
           });
@@ skipping 1127 matching lines @@
       // TODO(ahe): The constructor name is statically resolved. See
       // SsaCodeGenerator.visitInvokeDynamicMethod. Is there a cleaner
       // way to do this?
       SourceString name =
           new SourceString(backend.namer.getName(body.declaration));
       // TODO(kasperl): This seems fishy. We shouldn't be inventing all
       // these selectors. Maybe the resolver can do more of the work
       // for us here?
       LibraryElement library = body.getLibrary();
       Selector selector = new Selector.call(name, library, arity);
-      HInstruction invoke = new HInvokeDynamicMethod(selector, bodyCallInputs);
+      HInvokeDynamic invoke =
+          new HInvokeDynamicMethod(selector, bodyCallInputs);
       invoke.element = body;
       add(invoke);
     }
     close(new HReturn(newObject)).addSuccessor(graph.exit);
     return closeFunction();
   }
 
   void addParameterCheckInstruction(Element element) {
     // This is the code we emit for a parameter that is being checked
     // on whether it was given at value at the call site:
@@ skipping 1259 matching lines @@
     Element element = elements[closure];
     if (!Elements.isStaticOrTopLevelFunction(element)) {
       compiler.cancel(
           'JS_TO_CLOSURE requires a static or top-level method',
           node: closure);
     }
     FunctionElement function = element;
     // TODO(johnniwinther): Try to eliminate the need to distinguish declaration
     // and implementation signatures. Currently it is need because the
     // signatures have different elements for parameters.
-    FunctionSignature params
-        = function.implementation.computeSignature(compiler);
+    FunctionElement implementation = function.implementation;
+    FunctionSignature params = implementation.computeSignature(compiler);
     if (params.optionalParameterCount !== 0) {
       compiler.cancel(
           'JS_TO_CLOSURE does not handle closure with optional parameters',
           node: closure);
     }
     visit(closure);
     List<HInstruction> inputs = <HInstruction>[pop()];
     String invocationName = backend.namer.closureInvocationName(
         new Selector.callClosure(params.requiredParameterCount));
     push(new HForeign(new DartString.literal('#.$invocationName'),
@@ skipping 1749 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }