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From: "adam at wozniakconsulting dot com" <gcc-bugzilla@gcc.gnu.org>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109936

--- Comment #26 from Adam Wozniak <adam at wozniakconsulting dot com> ---
(In reply to Jonathan Wakely from comment #19)
> (In reply to Andreas Schwab from comment #10)
> > It is a valid preprocessing token ("non-whitespace character that canno=
t be
> > one of the above").
>=20
> Ah right, yes. It's a preprocessing token, but is never converted to a
> token, so doesn't need to be a keyword, identifier etc.

i feel like it should work for stringification reasons too.  e.g.

#define X(x) #x
const char *letterA =3D X(A);   // this works
const char *notequal =3D X(=E2=89=A0);  // this does not=