X-Git-Url: http://nitlanguage.org

diff --git a/lib/serialization/serialization.nit b/lib/serialization/serialization.nit
index b0dc728..7c689b6 100644
--- a/lib/serialization/serialization.nit
+++ b/lib/serialization/serialization.nit
@@ -106,7 +106,7 @@ abstract class Deserializer
 	# This method should be redefined for each custom subclass of `Serializable`.
 	# All refinement should look for a precise `class_name` and call super
 	# on unsupported classes.
-	protected fun deserialize_class(class_name: String): Object do
+	protected fun deserialize_class(class_name: String): nullable Object do
 		return deserialize_class_intern(class_name)
 	end
 
@@ -115,9 +115,9 @@ abstract class Deserializer
 	# Refinements to this method will be generated by the serialization phase.
 	# To avoid conflicts, there should not be any other refinements to this method.
 	# You can instead use `deserialize_class`.
-	protected fun deserialize_class_intern(class_name: String): Object do
-		print "Error: doesn't know how to deserialize class \"{class_name}\""
-		abort
+	protected fun deserialize_class_intern(class_name: String): nullable Object do
+		errors.add new Error("Deserialization Error: Doesn't know how to deserialize class \"{class_name}\"")
+		return null
 	end
 
 	# Should `self` keep trying to deserialize an object after an error?
@@ -131,7 +131,7 @@ abstract class Deserializer
 	# When at `true`, this may cause the accumulation of a lot of entries in `errors`.
 	#
 	# Default at `true`.
-	var keep_going: nullable Bool is writable
+	var keep_going: nullable Bool = null is writable
 
 	# Errors encountered in the last call to `deserialize`
 	var errors = new Array[Error]
@@ -191,7 +191,7 @@ interface Serializable
 	# Create an instance of this class from the `deserializer`
 	#
 	# This constructor is refined by subclasses to correctly build their instances.
-	init from_deserializer(deserializer: Deserializer) do end
+	init from_deserializer(deserializer: Deserializer) is nosuper do end
 end
 
 redef interface Object
@@ -242,7 +242,7 @@ redef class Couple[F, S]
 	end
 end
 
-redef class Container[E]
+redef class Ref[E]
 	super Serializable
 
 	redef init from_deserializer(v)