lib: fix NaiveCollection::length

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/collection/abstract_collection.nit b/lib/standard/collection/abstract_collection.nit
index a94c7b6..b6e734a 100644 (file)
--- a/lib/standard/collection/abstract_collection.nit
+++ b/lib/standard/collection/abstract_collection.nit
@@ -85,7 +85,7 @@ special Collection[E]
        redef fun length
        do
                var nb = 0
-               for i in self do nb += nb
+               for i in self do nb += 1 
                return nb
        end