Please consider this patch, which fixes the issue:
--- texinfo/Texinfo/Parser.pm
+++ texinfo/Texinfo/Parser.pm
@@ -2973,7 +2973,8 @@
$current->{'cmdname'});
}
my $arg =
$current->{'extra'}->{'block_command_line_contents'}->[0]->[0];
- if (!defined($arg->{'text'}) or $arg->{'text'} !~ /^[[:alnum:]]$/) {
+ if (!defined($arg->{'text'}) or ($arg->{'text'} !~ /^[[:alnum:]]$/
and
+ $arg->{'text'} !~ /^[0-9]+$/)) {
$self->_command_error($current, $line_nr,
$self->__("bad argument to \@%s"),
$current->{'cmdname'});-- Dmitry Shachnev
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