[texhax] Trying to find if a listing is continued with listings package

[Reinhard Kotucha]

On 2015-12-19 at 11:27:05 +0000, Philip Taylor wrote:

 > Shouldn't \undefined be \relax, Adrian ?  \csname ...\endcsname
 > sets its expansion to \relax if the resulting csname was previously
 > undefined.

Adrian is using listings.sty, hence I assume that he's using LaTeX.
LaTeX users should better use \@ifundefined instead of TeX primitives
or plain TeX macros.

Regards,
  Reinhard

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