Fix some warnings.

lib/compiler/implementation/ssa/builder.dart

Index: lib/compiler/implementation/ssa/builder.dart
diff --git a/lib/compiler/implementation/ssa/builder.dart b/lib/compiler/implementation/ssa/builder.dart
index f57db2a62021e75825c97ae53a1f17e569874982..fc4265a7f914139e80ce4ae6802130cf2cf814a1 100644
--- a/lib/compiler/implementation/ssa/builder.dart
+++ b/lib/compiler/implementation/ssa/builder.dart
@@ -196,8 +196,9 @@ class SsaBuilderTask extends CompilerTask {
 
         // If there is an estimate of the parameter types assume these types
         // when compiling.
+        FunctionElement function = element;

[ahe, 2012/10/03 14:56:33]

The test above could fail for things that aren't function elements.

[karlklose, 2012/10/04 08:50:00]

I added a TODO and an else branch that throws an internal error in the code
checking the kind above.

         OptionalParameterTypes defaultValueTypes = null;
-        FunctionSignature signature = element.computeSignature(compiler);
+        FunctionSignature signature = function.computeSignature(compiler);
         if (signature.optionalParameterCount > 0) {
           defaultValueTypes =
               new OptionalParameterTypes(signature.optionalParameterCount);
@@ -1334,7 +1335,8 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
       // 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);
     }
@@ -2614,8 +2616,8 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
     // 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',