From: Jean Privat <jean@pryen.org>
Date: Mon, 26 Aug 2019 15:22:34 +0000 (-0400)
Subject: Merge: digraph: Implementation of a reflexive directed graph
X-Git-Url: http://nitlanguage.org

Merge: digraph: Implementation of a reflexive directed graph

Add the implementation of a reflexive directed graph. Added element is in relation with itself (ie if the graph has `u` node is implies `self.has_arc(u,u) == true`)

Pull-Request: #2784
Reviewed-by: Alexandre Terrasa <alexandre@moz-code.org>
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