lib/string_search: avoid covariant array on `split_once_on`

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

diff --git a/lib/standard/string_search.nit b/lib/standard/string_search.nit
index 3a885ad..437341f 100644 (file)
--- a/lib/standard/string_search.nit
+++ b/lib/standard/string_search.nit
@@ -388,8 +388,14 @@ redef class Text
        fun split_once_on(p: Pattern): Array[SELFTYPE]
        do
                var m = p.search_in(self, 0)
-               if m == null then return [self]
-               return new Array[SELFTYPE].with_items(substring(0, m.from), substring_from(m.after))
+               var res = new Array[SELFTYPE]
+               if m == null then
+                       res.add self
+               else
+                       res.add substring(0, m.from)
+                       res.add substring_from(m.after)
+               end
+               return res
        end
 
        # Replace all occurences of a pattern with a string