Using a macro makes pdfetex quits and exits with bad status

@macro usubsec {label, titl}

@set lb \label\
@set tl \titl\
@ifclear usubsec-no-label
   @unnumberedsubsec @value{lb} @ @value{tl}
@end ifclear

@ifset usubsec-no-label
  @unnumberedsubsec @value{tl}
@end ifset

@end macro


> Sent: Wednesday, June 23, 2021 at 5:47 AM
> From: "Patrice Dumas" <[email protected]>
> To: "Christopher Dimech" <[email protected]>
> Cc: "help-texinfo gnu" <[email protected]>
> Subject: Re: Using a macro makes pdfetex quits and exits with bad status
>
> On Tue, Jun 22, 2021 at 07:21:33PM +0200, Christopher Dimech wrote:
> > Am running a macro that continues on the next line, but pdfetex quits and exits
> > with bad status.  Should this problem not have been fixed before?
>
> It probably depends on the macro and what it expands to.  You would need
> to provide a real case or more information.
>
> >
> > @usubsec{16D,
> > Utilisation of Rapid Computations}
>
>