$promise->reject($val) does the wrong thing when $val is a promise object

[akarelas]

• Mojolicious version: current unhandled_promises branch (3d91e75)
• Perl version: 5.30.2
• Operating system: Linux 5.3.0-51

Steps to reproduce the behavior

my $p1 = Mojo::Promise->new;
my $p2 = Mojo::Promise->new;
$p1->then(
    sub {say "p1 resolved: @_"},
    sub {say "p1 rejected: ", ($_[0] == $p2) ? '$p2' : $_[0]}
);

$p1->reject($p2);

Mojo::IOLoop->one_tick;

This script produces no output.

Expected behavior

The following output should be produced, according to: https://tc39.es/ecma262/#sec-promise-reject-functions point 7, and https://tc39.es/ecma262/#sec-rejectpromise points 3 and 8 (etc)

p1 rejected: $p2

Actual behavior

There was no output

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[akarelas]

This bug is fixed in master.