From 2c7abcb7102e424c4499b1bb47447eed805ec5a4 Mon Sep 17 00:00:00 2001
From: Dan Holmsand <holmsand@gmail.com>
Date: Sun, 1 Feb 2015 19:53:00 +0100
Subject: [PATCH] Add warning when derefing a changed wrap

---
 src/reagent/ratom.cljs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/reagent/ratom.cljs b/src/reagent/ratom.cljs
index c2d57fa..df23e1d 100644
--- a/src/reagent/ratom.cljs
+++ b/src/reagent/ratom.cljs
@@ -260,7 +260,7 @@
 
   IDeref
   (-deref [this]
-    (if-not (or auto-run *ratom-context*)
+    (if-not (or auto-run (some? *ratom-context*))
       (do
         (when dirty?
           (let [oldstate state]
@@ -321,7 +321,12 @@
   IAtom
 
   IDeref
-  (-deref [this] state)
+  (-deref [this]
+    (when (dev?)
+      (when (and changed (some? *ratom-context*))
+        (log "warning: derefing stale wrap: "
+             (pr-str this))))
+    state)
 
   IReset
   (-reset! [this newval]