Fix for issues 3729 and 3523

compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java

Index: compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
===================================================================
--- compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java	(revision 9267)
+++ compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java	(working copy)
@@ -1958,6 +1958,9 @@
 
     @Override
     public Type visitPropertyAccess(DartPropertyAccess node) {
+      if (node.isCascade()) {
+        return node.getQualifier().accept(this);
+      }
       if (node.getType() != null) {
         return node.getType();
       }
@@ -2297,6 +2300,17 @@
     private Type checkInvocation(DartInvocation node, DartNode diagnosticNode, String name,
         Type type) {
       List<DartExpression> argumentNodes = node.getArguments();
+      if (node instanceof DartMethodInvocation) {
+        DartMethodInvocation invocation = (DartMethodInvocation) node;
+        if (invocation.isCascade()) {
+          checkInvocation(argumentNodes, diagnosticNode, name, type);
+          DartExpression target = invocation.getTarget();
+          if (target == null) {
+            return getCurrentClass();
+          }
+          return target.accept(this);
+        }
+      }
       return checkInvocation(argumentNodes, diagnosticNode, name, type);
     }