isComputed() supported for lazy values

core/util.runtime/src/org/jetbrains/jet/storage/LockBasedStorageManager.java

@@ -155,6 +155,11 @@ public class LockBasedStorageManager implements StorageManager {
             this.computable = computable;
         }
 
+        @Override
+        public boolean isComputed() {
+            return value != NOT_COMPUTED && value != COMPUTING;
+        }
+
         @Override
         public T compute() {
             Object _value = value;

core/util.runtime/src/org/jetbrains/jet/storage/NotNullLazyValue.java

@@ -23,4 +23,7 @@ public interface NotNullLazyValue<T> extends Computable<T> {
     @Override
     @NotNull
     T compute();
+
+    // Needed for proper toString() behaviors
+    boolean isComputed();
 }

core/util.runtime/src/org/jetbrains/jet/storage/NullableLazyValue.java

@@ -23,4 +23,7 @@ public interface NullableLazyValue<T> extends Computable<T> {
     @Override
     @Nullable
     T compute();
+
+    // Needed for proper toString() behaviors
+    boolean isComputed();
 }

core/util.runtime/src/org/jetbrains/jet/storage/NullableLazyValueImpl.java

@@ -30,8 +30,9 @@ public abstract class NullableLazyValueImpl<T> implements NullableLazyValue<T> {
     @Nullable
     private Object value = State.NOT_COMPUTED;
 
+    @Override
     public boolean isComputed() {
-        return value != State.NOT_COMPUTED;
+        return value != State.NOT_COMPUTED && value != State.COMPUTING;
     }
 
     @Override