bug#20237: Emacs built on Windows cannot figure out path correctly

[Eli Zaretskii]

> Date: Sat, 04 Apr 2015 14:06:02 -0400
> From: Da Zhang <zhangda82@gmail.com>
> CC: 20237@debbugs.gnu.org
> 
> The 
> (w32-shell-dos-semantics)
> 
> returns nil.

OK, so what does this display:

  M-: (w32-shell-name) RET

> Can you please let me know how to use edebug to follow through 
> python-shell-parse-command? 

This is no longer needed: if w32-shell-dos-semantics returns nil, then
shell-quote-argument will quote every character not in the Posix
character set with a backslash.  This is what you see.  The question
is why w32-shell-dos-semantics returns nil.