New submission from Karthikeyan Singaravelan <tir.kar...@gmail.com>:

I used to launch IDLE using from master using ./python.exe -m idlelib . It used 
to work but fails on master on Mac OS now. There seems to be some discussion 
about this on msg332672 after the commit 
c1b4b0f6160e1919394586f44b12538505fed300. Feel free to close this if it's a 
known issue. I haven't tested it on latest 3.7 but it seems the commit was also 
merged to 3.7 so I am just adding 3.8 as version.

Mac OS version : 10.10.4

➜  cpython git:(master) ✗ git checkout c1b4b0f6160e1919394586f44b12538505fed300 
Lib/idlelib && ./python.exe -m idlelib
Traceback (most recent call last):
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/runpy.py", line 
192, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/runpy.py", line 
85, in _run_code
    exec(code, run_globals)
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/idlelib/__main__.py", 
line 7, in <module>
    idlelib.pyshell.main()
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/idlelib/pyshell.py", 
line 1507, in main
    macosx.setupApp(root, flist)
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/idlelib/macosx.py", 
line 280, in setupApp
    overrideRootMenu(root, flist)
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/idlelib/macosx.py", 
line 181, in overrideRootMenu
    del mainmenu.menudefs[-2][1][0]
IndexError: list assignment index out of range

➜  cpython git:(master) ✗ git checkout 
c1b4b0f6160e1919394586f44b12538505fed300~1 Lib/idlelib && ./python.exe -m 
idlelib # Works


$ git show c1b4b0f6160e1919394586f44b12538505fed300
commit c1b4b0f6160e1919394586f44b12538505fed300 (bpo35557, 35559)
Author: Cheryl Sabella <cheryl.sabe...@gmail.com>
Date:   Sat Dec 22 01:25:45 2018 -0500

     bpo-22703: IDLE: Improve Code Context and Zoom Height menu labels 
(GH-11214)



    The Code Context menu label now toggles between Show/Hide Code Context.
     The Zoom Height menu now toggles between Zoom/Restore Height.
     Zoom Height has moved from the Window menu to the Options menu.


    https://bugs.python.org/issue22703

----------
assignee: terry.reedy
components: IDLE
messages: 333945
nosy: cheryl.sabella, taleinat, terry.reedy, xtreak
priority: normal
severity: normal
status: open
title: IDLE: python -m idlelib fails on master on Mac OS 10.10.4
versions: Python 3.8

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<https://bugs.python.org/issue35770>
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