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First intermediate value of reduction with zip operator #6680

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p6rt opened this issue Mar 23, 2018 · 3 comments
Open

First intermediate value of reduction with zip operator #6680

p6rt opened this issue Mar 23, 2018 · 3 comments

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@p6rt
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@p6rt p6rt commented Mar 23, 2018

Migrated from rt.perl.org#133017 (status was 'open')

Searchable as RT133017$

@p6rt
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@p6rt p6rt commented Mar 23, 2018

From @nwellnhof

When using a reduction operator with the "intermediate results" option
combined with a zip operator, e.g. [\Z+], the first intermediate value is wrong​:

  say [\Z+] (1, 2, 3), (10, 20, 30), (100, 200, 300);
  # got​: ((6) (11 22 33) (111 222 333))
  # expected​: ((1 2 3) (11 22 33) (111 222 333))

Reduction with hyper operators like [\<<+>>] seems to work.

Only tested online on tio.run

  Rakudo version 2017.12 built on MoarVM version 2017.12
  implementing Perl 6.c.

and code-golf.io​:

  Rakudo version 2018.03 built on MoarVM version 2018.03
  implementing Perl 6.c

Nick

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@p6rt
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@p6rt p6rt commented Mar 24, 2018

From @AlexDaniel

Some extra info​:

Output on all releases (not a regression because the output was always wrong)​: https://gist.github.com/b4b27b8088a230a6051d634dc7b2d13e

The change in behavior happened in (2017-03-21) rakudo/rakudo@16f950b

Which links to RT#​131009 ( https://rt-archive.perl.org/perl6/Ticket/Display.html?id=131009 )

Also, FYI, we also accept bug reports on github​: https://github.com/rakudo/rakudo/issues

On 2018-03-23 07​:16​:22, wellnhofer@​aevum.de wrote​:

When using a reduction operator with the "intermediate results" option
combined with a zip operator, e.g. [\Z+], the first intermediate value
is wrong​:

say [\Z+] (1, 2, 3), (10, 20, 30), (100, 200, 300);
# got​: ((6) (11 22 33) (111 222 333))
# expected​: ((1 2 3) (11 22 33) (111 222 333))

Reduction with hyper operators like [\<<+>>] seems to work.

Only tested online on tio.run

Rakudo version 2017.12 built on MoarVM version 2017.12
implementing Perl 6.c.

and code-golf.io​:

Rakudo version 2018.03 built on MoarVM version 2018.03
implementing Perl 6.c

Nick

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@p6rt
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@p6rt p6rt commented Mar 24, 2018

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

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