--- a/eric7/DebugClients/Python/coverage/collector.py	Fri Aug 20 19:56:17 2021 +0200
+++ b/eric7/DebugClients/Python/coverage/collector.py	Sat Aug 21 14:21:44 2021 +0200
@@ -55,7 +55,7 @@
     _collectors = []
 
     # The concurrency settings we support here.
-    SUPPORTED_CONCURRENCIES = set(["greenlet", "eventlet", "gevent", "thread"])
+    SUPPORTED_CONCURRENCIES = {"greenlet", "eventlet", "gevent", "thread"}
 
     def __init__(
         self, should_trace, check_include, should_start_context, file_mapper,