serialization: fix typo and warning

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/serialization/serialization.nit b/lib/serialization/serialization.nit
index 597ae98..e7f9cf6 100644 (file)
--- a/lib/serialization/serialization.nit
+++ b/lib/serialization/serialization.nit
@@ -74,11 +74,12 @@ interface Serializer
        fun serialize_attribute(name: String, value: nullable Object)
        do
                if not try_to_serialize(value) then
+                       assert value != null # null would have been serialized
                        warn("argument {name} of type {value.class_name} is not serializable.")
                end
        end
 
-       # Serialize `value` is possie, i.e. it is `Serializable` or `null`
+       # Serialize `value` is possible, i.e. it is `Serializable` or `null`
        fun try_to_serialize(value: nullable Object): Bool
        do
                if value isa Serializable then