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On Wed, Mar 14, 2018 at 12:38:19PM +0300, Sergey Zakharchenko wrote:

> Lua 5.4.0 (work1)  Copyright (C) 1994-2018 Lua.org, PUC-Rio
> > =undef
> stdin:1: 'undef' is not a value!!

I think one exclamation mark is sufficient; two seems rather exuberant.

:)

B.