From 1b8b1cd7b13ad9cfb8f2a79cc48dd353d4ffe4df Mon Sep 17 00:00:00 2001
From: Mike J Innes <mike.j.innes@gmail.com>
Date: Wed, 14 Feb 2018 21:00:50 +0000
Subject: [PATCH] check params by identity

---
 src/treelike.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/treelike.jl b/src/treelike.jl
index 01be4f35..7000baf8 100644
--- a/src/treelike.jl
+++ b/src/treelike.jl
@@ -37,7 +37,7 @@ function params(m)
   ps = []
   prefor(p ->
     Tracker.istracked(p) && Tracker.isleaf(p) &&
-      !(p in ps) && push!(ps, p),
+      !any(p′ -> p′ === p, ps) && push!(ps, p),
     m)
   return ps
 end