hyperref: possible bug when using \@addtoreset {<counter>}{@clckpt}

[GL]

Hello,

The LaTeX macro \cl@@ckpt maintains a list of counter.

The simplest way to append a counter in the list is to use :

\@addtoreset {counter}{@clckpt}

But hyperref redefines \@addtoreset in order for it to define
\theH<counter>
without the longer test made when the command \theH<counter>
does not exist: if \theH<counter> does not exit, hyperref
executes \***@ProvideTheHCounter which looks into \cl@@ckpt
to find a possibly parent counter.

But @ckpt is NOT a counter, and \cl@@ckpt is NOT comparable
to \***@section for example.

So:
\@addtoreset {counter}{@clckpt}

has not the same meaning as :
\@addtoreset {counter}{parent-counter}

But hyperref does not make the check, so that:
\@addtoreset {counter}{@clckpt}

finally defines: \theHcounter -> \***@clckpt .\the\value {counter}

And \***@clckpt is a undefined control sequence, since @ckpt is not a
counter.

I think hyperref should check that special use of \@addtoreset with
@ckpt, when redefining \@addtoreset.

Thanks by advance.

[Ulrike Fischer]

Post by GL
@ckpt, when redefining \@addtoreset.

The issue tracker for hyperref is here:
https://github.com/ho-tex/hyperref/issues

And you should add a complete example that demonstrates the issue.