html_basic report broken (missing sub headers and package statements)

[perlpunk]

I was trying out the html_basic report and noticed that all subroutine headers and package statements are missing from the report. They are not even counted, so that the line numbers are also off.

Unfortunately I cannot reproduce it on my machine, only in a docker container.
registry.opensuse.org/devel/openqa/containers15.3/os-autoinst_dev
It's openSUSE Leap 15.3 with perl 5.26.1

I put together a simple reproducer:

$ cat t/foo.t
use strict;
use warnings;
use Test::More tests => 1;
use Foo;
my $x = Foo::foo(21);
is $x, 42, "x=42";
$ cat lib/Foo.pm
package Foo;
use strict;
use warnings;

sub foo {
    my ($arg) = @_;
    return $arg * 2;
}

1;
$ PERL5OPT=-MDevel::Cover prove -l t/foo.t
...
$ cover -report html_basic cover_db
Reading database from /tmp/autoinst/cover_db


-------------- ------ ------ ------ ------ ------ ------ ------
File             stmt   bran   cond    sub    pod   time  total
-------------- ------ ------ ------ ------ ------ ------ ------
/usr/bin/prove  100.0   50.0    n/a  100.0    n/a   15.7   87.5
lib/Foo.pm      100.0    n/a    n/a  100.0    0.0    0.0   91.6
t/foo.t         100.0    n/a    n/a  100.0    n/a   84.2  100.0
Total           100.0   50.0    n/a  100.0    0.0  100.0   93.1
-------------- ------ ------ ------ ------ ------ ------ ------


HTML output written to /tmp/autoinst/cover_db/coverage.html

Here's a screenshot of the report:

Installed is Devel::Cover 1.36, but there is no difference when I install 1.38.

When I use this example on my laptop, then I actually get the same bug as reported in #270 , but so far I wasn't able to find out which different module versions are responsible for that.

Let me know if you need more information. But if you pull the mentioned docker image, you should be able to reproduce it.

[openstrike]

I have just installed version 1.38 and can confirm this happens natively too (ie. outside a container).

[WenjingLi2036]

Adding a switch noppihtml like "cover -report html_basic -noppihtml cover_db" works for me.