Don't call dinvoke on Object methods

lib/src/utils.dart

Index: lib/src/utils.dart
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index 58989f874e64f2a64df8cbade30f525833d4b6ac..ea28a6df6b4c751a9ebb0d332718ab6da4c913d7 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -16,7 +16,9 @@ import 'package:analyzer/src/generated/ast.dart'
         CompilationUnit,
         Identifier,
         AnnotatedNode,
-        AstNode;
+        AstNode,
+        Expression,
+        SimpleIdentifier;
 import 'package:analyzer/src/generated/engine.dart'
     show ParseDartTask, AnalysisContext;
 import 'package:analyzer/src/generated/source.dart' show Source;
@@ -201,6 +203,12 @@ _MemberTypeGetter _memberTypeGetter(ExecutableElement member) {
   return f;
 }
 
+bool isDynamicTarget(Expression target) {
+  return target != null &&
+      !(target is SimpleIdentifier && target.staticElement is PrefixElement) &&
+      target.staticType.isDynamic;
+}
+
 /// Returns an ANSII color escape sequence corresponding to [levelName]. Colors
 /// are defined for: severe, error, warning, or info. Returns null if the level
 /// name is not recognized.