Constructor parameters should have this.<field> reference elements set.

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

Index: compiler/java/com/google/dart/compiler/resolver/Resolver.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Resolver.java b/compiler/java/com/google/dart/compiler/resolver/Resolver.java
index d30d11a4fdda2c447bb99bc4c48fd162116501cc..a80599b97c618c428c6b5167dad748c6f95d7893 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Resolver.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Resolver.java
@@ -1305,6 +1305,11 @@ public class Resolver {
         // Field parameters are not visible as parameters, so we do not declare them
         // in the context. Instead we record the resolved field element.
         Elements.setParameterInitializerElement(parameter.getSymbol(), element);
+
+        // The editor expects the referenced elements to be non-null
+        DartPropertyAccess prop = (DartPropertyAccess)parameter.getName();

[fabiomfv, 2011/11/01 14:08:56]

DBC - bear in mind that the parameter is not strictly the field. it is a field
in the scope of the constructor body, init list. we need to be sure this will
not have undesired side effect during object creation. 

[codefu, 2011/11/01 18:00:20]

Double checked and everything looks good.  All presubmit tests pass.

+        prop.setReferencedElement(element);
+        prop.getName().setReferencedElement(element);
       } else {
         onError(parameter.getName(),
             ResolverErrorCode.PARAMETER_INIT_OUTSIDE_CONSTRUCTOR);