Issue 3550. Initial understanding "const".

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 7b88ed146532d7e4709e6eb3e1b02ef4297ea07c..1aa79b7ba51d43b85d356887f0c83f98ab48dbf5 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Resolver.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Resolver.java
@@ -671,7 +671,9 @@ public class Resolver {
           Elements.setType(element, fieldType);
         }
       } else if (isFinal) {
-        if (isStatic) {
+        if (modifiers.isConstant()) {
+          onError(node, ResolverErrorCode.CONST_REQUIRES_VALUE);
+        } else if (isStatic) {
           onError(node, ResolverErrorCode.STATIC_FINAL_REQUIRES_VALUE);
         } else if (isTopLevel) {
           onError(node, ResolverErrorCode.TOPLEVEL_FINAL_REQUIRES_VALUE);