NiceSlice code with dubious "=over" fails in 2.080

HI Ed,
make test fails with NiceSlice errors, so do a lot of programs. Both latest git as from CPAN.
2.079 still works.
Is this maybe related to Text-Balanced? Installed version is 2.06. Debian linux.

Here's a quite minimal example. I think it has to do with ( ) or {} in comments.

PDL 2.080: perl -Mblib -e "use test_ns; "

syntax error at /home/ingo/perl/test_ns.pm line 24, near "$iii("
Compilation failed in require at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

PDL 2.079: perl -Mblib -e "use test_ns; "

syntax error at /home/ingo/perl/test_ns.pm line 24, near "$iii("
Compilation failed in require at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

test_ns.pm:

#!/usr/bin/perl  

package test_ns;
use PDL;
use PDL::NiceSlice;

=over
sub fmod {
        my $x=shift;
        my $y=shift; 
        my $n=floor $x/$y; 
        return $x-$n*$y;
}


sub amp {
        my $i=shift; 
        return (sqrt($i((0),)**2+$i((1),)**2));
}
=cut

sub phase {
        my $iii=shift;
        return (atan2($iii((1),),$iii((0),)));
}

# { 
# #} sMDH;                                        // total length: 32 * 32 Bit (128 Byte)            128
#

1;

Start with the minimal test case in test_ns.pm and run make test on the reported PDL 2.080 setup. Read the PDL::NiceSlice handling around the =over/=cut block and the commented braces, then compare behavior with 2.079 and the installed Text-Balanced 2.06. Done means the example and the affected test suite pass without breaking NiceSlice parsing.