From e01bdf2432511b8bf51ecfd4fb46f140dbedae04 Mon Sep 17 00:00:00 2001
From: "Paul \"LeoNerd\" Evans" <paul@matrix.org>
Date: Wed, 20 Aug 2014 15:25:17 +0100
Subject: [PATCH] Define __copy__ and __deepcopy__ as identity functions on
 DomainSpecificString, so that copy.deepcopy() will work on them

---
 synapse/types.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/synapse/types.py b/synapse/types.py
index b8e191bb3c..fd6a3d1d72 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -38,6 +38,14 @@ class DomainSpecificString(
     def __iter__(self):
         raise ValueError("Attempted to iterate a %s" % (type(self).__name__))
 
+    # Because this class is a namedtuple of strings and booleans, it is deeply
+    # immutable.
+    def __copy__(self):
+        return self
+
+    def __deepcopy__(self, memo):
+        return self
+
     @classmethod
     def from_string(cls, s, hs):
         """Parse the string given by 's' into a structure object."""