From f3b5c2a97a3e7f5066018301a733f0b8d21241fa Mon Sep 17 00:00:00 2001
From: Bruce Edelman <bruce.edelman@ligo.org>
Date: Mon, 30 Mar 2020 20:07:37 -0500
Subject: [PATCH] Revert "remove unnecessary constraint checking:"

This reverts commit ed0614245b8cbe15f6422dbdc003a438868c0517.
---
 docs/prior.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/prior.txt b/docs/prior.txt
index 8f89a0ad..8e5f2944 100644
--- a/docs/prior.txt
+++ b/docs/prior.txt
@@ -178,8 +178,9 @@ First thing: define a function which generates z=x-y from x and y.
         -------
         dict: Dictionary with constraint parameter 'z' added.
         """
-        parameters['z'] = parameters['x'] - parameters['y']
-        return parameters
+        converted_parameters = parameters.copy()
+        converted_parameters['z'] = parameters['x'] - parameters['y']
+        return converted_parameters
 
 Create our prior:
 
-- 
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