From 34da0a32b9a9b97b5e5044d32e54bf1b3a3bdcc9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andres=20N=C3=B6tzli?= <andres.noetzli@gmail.com>
Date: Wed, 16 Mar 2016 17:12:45 -0700
Subject: [PATCH] [Z3py] Fix error in FPRef.__neg__()

`FPRef.__neg__()` did not work previously because it tried to construct an FPRef from an FPRef (`fpNeg()` already returns an FPRef).
---
 src/api/python/z3.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/api/python/z3.py b/src/api/python/z3.py
index 5727d2dfb..374c71be4 100644
--- a/src/api/python/z3.py
+++ b/src/api/python/z3.py
@@ -8178,8 +8178,13 @@ class FPRef(ExprRef):
         return self
 
     def __neg__(self):
-        """Create the Z3 expression `-self`."""
-        return FPRef(fpNeg(self))
+        """Create the Z3 expression `-self`.
+        
+        >>> x = FP('x', Float32())
+        >>> -x
+        -x
+        """
+        return fpNeg(self)
 
     def __div__(self, other):
         """Create the Z3 expression `self / other`.