From 7e983c74cb3dfe32788ba8b002c0f819b1158235 Mon Sep 17 00:00:00 2001
From: Mike J Innes <mike.j.innes@gmail.com>
Date: Wed, 29 Mar 2017 17:47:43 +0100
Subject: [PATCH] make this immutable again

---
 src/model.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/model.jl b/src/model.jl
index f8f7f6bb..e83426dc 100644
--- a/src/model.jl
+++ b/src/model.jl
@@ -127,7 +127,7 @@ graph(cap::Capacitor) = cap.graph
 
 # Recurrent Models
 
-mutable struct Stateful <: Model
+struct Stateful <: Model
   model
   state::Vector{Any}
 end
@@ -135,7 +135,7 @@ end
 function (m::Stateful)(x)
   runrawbatched(x) do x
     state, y = runmodel(m.model, (m.state...,), x)
-    m.state = collect(state)
+    m.state .= state
     return y
   end
 end