Issue #25203: Failed readline.set_completer_delims() no longer left the

module in inconsistent state.

diff --cc Misc/NEWS
index 1e13f63483a8fabd2d5352a70e4bf2158ffebfde,6793215a310faa4b653d0cea8c296c322b93413d..241eafa3c000284fd819e941e5506635d29ed985
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -21,9 -81,9 +21,12 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #25203: Failed readline.set_completer_delims() no longer left the
+   module in inconsistent state.
+ 
 +- Issue #23329: Allow the ssl module to be built with older versions of
 +  LibreSSL.
 +
  - Prevent overflow in _Unpickler_Read.
  
  - Issue #25047: The XML encoding declaration written by Element Tree now

diff --cc Modules/readline.c
Simple merge