emacs early on could have known it could not write a non owned file

[Dan Jacobson]

Be root and
# touch /tmp/a
now as a regular user, try to C-x C-w /tmp/a some file.
File `/tmp/a' exists; overwrite? (y or n) y
File a is write-protected; try to save anyway? (yes or no) yes
Doing chmod: operation not permitted, /tmp/a

Ok, Emacs, being college educated, should, instead giving me two quiz
questions, have detected the certain failure way back at line zero,
and so informed the user.  [root excepted: root should only get the
first warning...]
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