From 4aeac66d004c6bfd7775424921d78697ad320410 Mon Sep 17 00:00:00 2001
From: Simon MacMullen <simon@rabbitmq.com>
Date: Thu, 3 Jan 2013 13:32:01 +0000
Subject: Explain

---
 src/credit_flow.erl | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/credit_flow.erl')

diff --git a/src/credit_flow.erl b/src/credit_flow.erl
index ec9b2c36..8f1d4d00 100644
--- a/src/credit_flow.erl
+++ b/src/credit_flow.erl
@@ -56,6 +56,9 @@
 %% closure creation a HOF would introduce
 -define(UPDATE(Key, Default, Var, Expr),
         begin
+            %% We delibarately allow Var to escape from the case here
+            %% to be used in Expr. Any temporary var we introduced
+            %% would also escape, and might conflict.
             case get(Key) of
                 undefined -> Var = Default;
                 Var       -> ok
-- 
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