Renamed JetType.isNullable() to isMarkedNullable()

core/serialization/src/org/jetbrains/jet/descriptors/serialization/DescriptorSerializer.java

@@ -351,7 +351,7 @@ public class DescriptorSerializer {
         }
 
         // to avoid storing a default
-        if (type.isNullable()) {
+        if (type.isMarkedNullable()) {
             builder.setNullable(true);
         }
 

core/serialization/src/org/jetbrains/jet/descriptors/serialization/DeserializedType.kt

@@ -43,7 +43,7 @@ class DeserializedType(
 
     override fun getArguments(): List<TypeProjection> = arguments
 
-    override fun isNullable(): Boolean = typeProto.getNullable()
+    override fun isMarkedNullable(): Boolean = typeProto.getNullable()
 
     private fun computeMemberScope(): JetScope =
             if (isError()) {