Fix for issue 2437

compiler/java/com/google/dart/compiler/resolver/Resolver.java

Index: compiler/java/com/google/dart/compiler/resolver/Resolver.java
===================================================================
--- compiler/java/com/google/dart/compiler/resolver/Resolver.java	(revision 9032)
+++ compiler/java/com/google/dart/compiler/resolver/Resolver.java	(working copy)
@@ -1036,6 +1036,18 @@
         onError(x, ResolverErrorCode.USING_LOCAL_VARIABLE_BEFORE_DECLARATION, x);
       }
 
+      if (!isQualifier) {
+        switch (ElementKind.of(element)) {
+          case CLASS:
+          case FUNCTION_TYPE_ALIAS:
+            onError(x, ResolverErrorCode.CANNOT_USE_TYPE, name);
+            break;
+          case TYPE_VARIABLE:
+            onError(x, ResolverErrorCode.CANNOT_USE_TYPE_VARIABLE, name);
+            break;
+        }
+      }
+
       // If we we haven't resolved the identifier, it will be normalized to
       // this.<identifier>.