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-rw-r--r--scripts/qapi-visit.py7
1 files changed, 3 insertions, 4 deletions
diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index b3a308fb51..9fc040e0f6 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -16,14 +16,13 @@ from ordereddict import OrderedDict
 from qapi import *
 import re
 
-implicit_structs = []
+implicit_structs_seen = set()
 struct_fields_seen = set()
 
 def generate_visit_implicit_struct(type):
-    global implicit_structs
-    if type in implicit_structs:
+    if type in implicit_structs_seen:
         return ''
-    implicit_structs.append(type)
+    implicit_structs_seen.add(type)
     ret = ''
     if type not in struct_fields_seen:
         # Need a forward declaration