Terry J. Reedy added the comment:
None.get_saved is #35623. I believe it is related to #35379, where I requested
your comment on what I found so far.
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1. Compiler warnings for shell input go to sys.__stderr, which only exists when
IDLE is started from a console. This will include Syntax
New submission from Serhiy Storchaka :
DeprecationWarning at compile time is output multiple times to the stderr (on
console from which IDLE was ran), but not to IDLE Shell window.
For example, when enter '\e':
$ ./python -m idlelib
Warning (from warnings module):
File "", line 1
'\e'
