coloring: replace static bound of OrderedSet[nullable Object] with Object

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/src/coloring.nit b/src/coloring.nit
index a0dcae8..0867294 100644 (file)
--- a/src/coloring.nit
+++ b/src/coloring.nit
@@ -1319,7 +1319,7 @@ end
 # Utils
 
 # An ordered set
-class OrderedSet[E]
+class OrderedSet[E: Object]
        super Array[E]
 
        init do end