From @zoffixznet

Detected by pre-release ecosystem toasting.

Clifford.pm6 module currently fails due List.MixHash coercer
fails to delete the key when the final weight ends up being zero​:

  <Zoffix> c​: 2017.05,HEAD dd (0 => 1, 0 => -1, 0 => 0, ).MixHash
  <committable6> Zoffix, ¦2017.05​: «().MixHash» ¦HEAD(abfb52b)​: «(0=>0).MixHash»

The issue only appears to happen the weights change from non-zero to zero while going through Pairs​:

  <Zoffix> c​: 2017.05,HEAD dd (0 => 0, ).MixHash
  <committable6> Zoffix, ¦2017.05,HEAD(abfb52b)​: «().MixHash»
  <Zoffix> c​: 2017.05,HEAD dd (0 => 0, 0 => 0,).MixHash
  <committable6> Zoffix, ¦2017.05,HEAD(abfb52b)​: «().MixHash»

From @lizmat

Thanks for the report! Fixed with rakudo/rakudo@bf95bcb6c0
Tests will be added shortly.

On 13 Jun 2017, at 00​:52, Zoffix Znet (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by Zoffix Znet
# Please include the string​: [perl #​131561]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=131561 >

Detected by pre-release ecosystem toasting.

Clifford.pm6 module currently fails due List.MixHash coercer
fails to delete the key when the final weight ends up being zero​:

<Zoffix> c​: 2017.05,HEAD dd (0 => 1, 0 => -1, 0 => 0, ).MixHash
<committable6> Zoffix, ¦2017.05​: «().MixHash» ¦HEAD(abfb52b)​: «(0=>0).MixHash»

The issue only appears to happen the weights change from non-zero to zero while going through Pairs​:

<Zoffix> c​: 2017.05,HEAD dd (0 => 0, ).MixHash
<committable6> Zoffix, ¦2017.05,HEAD(abfb52b)​: «().MixHash»
<Zoffix> c​: 2017.05,HEAD dd (0 => 0, 0 => 0,).MixHash
<committable6> Zoffix, ¦2017.05,HEAD(abfb52b)​: «().MixHash»

The RT System itself - Status changed from 'new' to 'open'

From @dogbert17

On Tue, 13 Jun 2017 01​:13​:43 -0700, elizabeth wrote​:

Thanks for the report! Fixed with
rakudo/rakudo@bf95bcb6c0
Tests will be added shortly.

On 13 Jun 2017, at 00​:52, Zoffix Znet (via RT) <perl6-bugs-
followup@​perl.org> wrote​:

# New Ticket Created by Zoffix Znet
# Please include the string​: [perl #​131561]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=131561 >

Detected by pre-release ecosystem toasting.

Clifford.pm6 module currently fails due List.MixHash coercer
fails to delete the key when the final weight ends up being zero​:

<Zoffix> c​: 2017.05,HEAD dd (0 => 1, 0 => -1, 0 => 0, ).MixHash
<committable6> Zoffix, ¦2017.05​: «().MixHash» ¦HEAD(abfb52b)​:
«(0=>0).MixHash»

The issue only appears to happen the weights change from non-zero to
zero while going through Pairs​:

<Zoffix> c​: 2017.05,HEAD dd (0 => 0, ).MixHash
<committable6> Zoffix, ¦2017.05,HEAD(abfb52b)​: «().MixHash»
<Zoffix> c​: 2017.05,HEAD dd (0 => 0, 0 => 0,).MixHash
<committable6> Zoffix, ¦2017.05,HEAD(abfb52b)​: «().MixHash»

Tests have been added, resolving issue

@dogbert17 - Status changed from 'open' to 'resolved'