check possible recursive _as_parameter_ to prevent segfault (closes #1838)
diff --git a/Misc/NEWS b/Misc/NEWS
index 151bc1c..3c590ac 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -245,6 +245,9 @@
 Extension Modules
 -----------------
 
+- Issue #1838: Prevent segfault in ctypes, when _as_parameter_ on a class is set
+  to an instance of the class.
+
 - Issue #678250: Make mmap flush a noop on ACCESS_READ and ACCESS_COPY.
 
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