bug#18745:

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Wed, 28 Oct 2015 00:24:29 +0100
> Cc: 18745@debbugs.gnu.org
> 
> > Do you see the same result if you invoke 'echo' from the cmd prompt?
> > IOW, does this mean Windows 10 changed the behavior of the built-in
> > 'echo', and it now removes trailing whitespace from its argument?
> 
> IIUC your question, no
> 
> C:\Users\Juanma>echo A>A.txt
> 
> C:\Users\Juanma>echo B >B.txt
> 
> C:\Users\Juanma>dir *.txt
> 
> 28/10/2015 00:23 3 A.txt
> 28/10/2015 00:23 7 B.txt
> 2 archivos 10 bytes

The test actually uses a batch file, so I think it's worthwhile to try
that, and see if the behavior of 'echo' when called from a batch file
changed.

If not, then please try digging deeper, because the unmodified test
work OK for me (not on Windows 10).