[tex-eplain] Undefined label

Oleg Katsitadze olegkat at gmail.com
Wed Apr 29 05:56:32 CEST 2009

On Tue, Apr 28, 2009 at 06:49:26PM +0100, Rodolfo Medina wrote:
> Inside a certain definition, I want to create a condition on the existence of
> an undefined label:

Taken from \@definelabel in xeplain.tex:

    \expandafter\ifx\csname\xrlabel{#1}\endcsname \relax
      % Label is undefined.
      % Label is defined.


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