From 491b8f0501c7b3d8b7c33d85a430845d245da5c9 Mon Sep 17 00:00:00 2001
From: Vivien Maisonneuve <v.maisonneuve@gmail.com>
Date: Wed, 11 Jun 2014 20:19:20 +0200
Subject: [PATCH] Fix Expression.__rsub__

---
 pypol/linear.py      | 3 ++-
 tests/test_linear.py | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/pypol/linear.py b/pypol/linear.py
index de6f4ca..c169049 100644
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -158,7 +158,8 @@ class Expression:
         constant = self.constant - other.constant
         return Expression(coefficients, constant)
 
-    __rsub__ = __sub__
+    def __rsub__(self, other):
+        return -(self - other)
 
     @_polymorphic_method
     def __mul__(self, other):
diff --git a/tests/test_linear.py b/tests/test_linear.py
index 93fc838..4079d75 100644
--- a/tests/test_linear.py
+++ b/tests/test_linear.py
@@ -99,6 +99,7 @@ class TestExpression(unittest.TestCase):
     def test_sub(self):
         self.assertEqual(self.x - self.x, 0)
         self.assertEqual(self.e - 3, self.x - 2*self.y)
+        self.assertEqual(0 - self.x, -self.x)
 
     def test_mul(self):
         self.assertEqual(self.pi * 7, 22)
-- 
2.20.1