Issue 4315. Fix for type of cascade assignment

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

Index: compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
diff --git a/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java b/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
index 89dd0723855eaefe80e2f74fcac6fa7ca380b9f9..1c11c7ea8425c67921bcd53386f6551b6299b1da 100644
--- a/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
+++ b/compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java
@@ -361,6 +361,14 @@ public class TypeAnalyzer implements DartCompilationPhase {
             checkAssignable(rhsNode, lhs, rhs);
           }
           checkAssignableElement(lhsNode);
+          // if cascade, then use type of "lhs" qualifier
+          if (lhsNode instanceof DartPropertyAccess) {
+            DartPropertyAccess lhsAccess = (DartPropertyAccess) lhsNode;
+            if (lhsAccess.isCascade()) {
+              return lhsAccess.getQualifier().getType();
+            }
+          }
+          // use type or "rhs"
           return rhs;
         }
 
@@ -1976,9 +1984,6 @@ public class TypeAnalyzer implements DartCompilationPhase {
 
     @Override
     public Type visitPropertyAccess(DartPropertyAccess node) {
-      if (node.isCascade()) {
-        return node.getQualifier().accept(this);
-      }
       if (node.getType() != null) {
         return node.getType();
       }