Don't call dinvoke on Object methods

lib/src/checker/checker.dart

Index: lib/src/checker/checker.dart
diff --git a/lib/src/checker/checker.dart b/lib/src/checker/checker.dart
index 024a066ca63de43dfab84015068e927b21c4657c..ef030ec7c7c2fef6a1671d4594fb5f12694cd8a3 100644
--- a/lib/src/checker/checker.dart
+++ b/lib/src/checker/checker.dart
@@ -456,19 +456,21 @@ class CodeChecker extends RecursiveAstVisitor {
   }
 
   // Check invocations
-  bool checkArgumentList(ArgumentList node, FunctionType type) {
+  bool checkArgumentList(ArgumentList node, DartType type) {
     NodeList<Expression> list = node.arguments;
     int len = list.length;
+    if (len == 0) return true;
+    FunctionType ft = type;
     for (int i = 0; i < len; ++i) {
       Expression arg = list[i];
       ParameterElement element = node.getStaticParameterElementFor(arg);
       if (element == null) {
-        if (type.parameters.length < len) {
+        if (ft.parameters.length < len) {
           // We found an argument mismatch, the analyzer will report this too,
           // so no need to insert an error for this here.
           continue;
         }
-        element = type.parameters[i];
+        element = ft.parameters[i];
         // TODO(vsm): When can this happen?
         assert(element != null);
       }
@@ -566,7 +568,7 @@ class CodeChecker extends RecursiveAstVisitor {
   }
 
   visitPropertyAccess(PropertyAccess node) {
-    if (_rules.isDynamicGet(node.realTarget)) {
+    if (_rules.isDynamicGet(node.realTarget, node.propertyName.name)) {
       _recordDynamicInvoke(node);
     }
     node.visitChildren(this);
@@ -576,7 +578,8 @@ class CodeChecker extends RecursiveAstVisitor {
     final target = node.prefix;
     // Check if the prefix is a library - PrefixElement denotes a library
     // access.
-    if (target.staticElement is! PrefixElement && _rules.isDynamicGet(target)) {
+    if (target.staticElement is! PrefixElement &&
+        _rules.isDynamicGet(target, node.identifier.name)) {
       _recordDynamicInvoke(node);
     }
     node.visitChildren(this);