From a7e855b3193bfcbf941e997831fac9591cceb09a Mon Sep 17 00:00:00 2001
From: David Nadlinger <code@klickverbot.at>
Date: Wed, 29 Jul 2020 23:15:07 +0100
Subject: [PATCH] compiler.types: Change invalid default value [nfc]

This wasn't actually ever used, but was a dict instead of a set.
---
 artiq/compiler/types.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/artiq/compiler/types.py b/artiq/compiler/types.py
index 206f040fb..deeb8352b 100644
--- a/artiq/compiler/types.py
+++ b/artiq/compiler/types.py
@@ -296,7 +296,7 @@ class TCFunction(TFunction):
 
     attributes = OrderedDict()
 
-    def __init__(self, args, ret, name, flags={}):
+    def __init__(self, args, ret, name, flags=set()):
         assert isinstance(flags, set)
         for flag in flags:
             assert flag in {'nounwind', 'nowrite'}