Issue #18711: Add a new `PyErr_FormatV` function, similar to `PyErr_Format` but accepting a `va_list` argument.
diff --git a/PC/python3.def b/PC/python3.def
index fad6448..5257d5e 100644
--- a/PC/python3.def
+++ b/PC/python3.def
@@ -120,6 +120,7 @@
   PyErr_ExceptionMatches=python35.PyErr_ExceptionMatches
   PyErr_Fetch=python35.PyErr_Fetch
   PyErr_Format=python35.PyErr_Format
+  PyErr_FormatV=python35.PyErr_FormatV
   PyErr_GivenExceptionMatches=python35.PyErr_GivenExceptionMatches
   PyErr_NewException=python35.PyErr_NewException
   PyErr_NewExceptionWithDoc=python35.PyErr_NewExceptionWithDoc