From f7254dd3cec770458f82d546bd4a4f1d893be6fc Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Fri, 9 Jun 2017 07:31:08 +0000
Subject: [PATCH] compiler.validators.constness: take AugAssign into account.

---
 artiq/compiler/validators/constness.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/artiq/compiler/validators/constness.py b/artiq/compiler/validators/constness.py
index 53f987bed..bfe228015 100644
--- a/artiq/compiler/validators/constness.py
+++ b/artiq/compiler/validators/constness.py
@@ -17,6 +17,12 @@ class ConstnessValidator(algorithm.Visitor):
         self.visit(node.targets)
         self.in_assign = False
 
+    def visit_AugAssign(self, node):
+        self.visit(node.value)
+        self.in_assign = True
+        self.visit(node.target)
+        self.in_assign = False
+
     def visit_SubscriptT(self, node):
         old_in_assign, self.in_assign = self.in_assign, False
         self.visit(node.value)