mro next::method doesn't work from imported method

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Migrated from rt.perl.org#125461 (status was 'open')

Searchable as RT125461$

[p5pRT]

From @dolmen

Hi,

I would like to use next​::method from a method implemented in a role and injected in a class by aliasing methods.
But it seems next​::method doesn't work in that case​: it doesn't find the super method.

See the attached code for a self contained minimal test case.

Here is the (failing) output​:

------8<------8<------8<------8<------8<------8<------8<------
$ perl next_method.pl
1..1
# perl v5.22.0
Hi2 from Child!
Hi2 from Parent!
Hi2 from Child!
Hi2 from Parent!
Hi from Role!
not ok 1
# Failed test at next_method.pl line 69.
# got​: 'No next​::method 'hello' found for Child at /home/omengue/.plenv/versions/5.22.0/lib/perl5/5.22.0/x86_64-linux/mro.pm line 27.
# '
# expected​: undef
# Looks like you failed 1 test of 1.
------8<------8<------8<------8<------8<------8<------8<------

--
Olivier Mengué <dolmen@​cpan.org>

[p5pRT]

From @dolmen

next_method.pl

[p5pRT]

From @dolmen

This ticket didn't get much attention.

Le Mar 23 Juin 2015 05​:29​:11, dolmen a écrit :

Hi,

I would like to use next​::method from a method implemented in a role
and injected in a class by aliasing methods.
But it seems next​::method doesn't work in that case​: it doesn't find
the super method.

See the attached code for a self contained minimal test case.

Here is the (failing) output​:

------8<------8<------8<------8<------8<------8<------8<------
$ perl next_method.pl
1..1
# perl v5.22.0
Hi2 from Child!
Hi2 from Parent!
Hi2 from Child!
Hi2 from Parent!
Hi from Role!
not ok 1
# Failed test at next_method.pl line 69.
# got​: 'No next​::method 'hello' found for Child at
/home/omengue/.plenv/versions/5.22.0/lib/perl5/5.22.0/x86_64-
linux/mro.pm line 27.
# '
# expected​: undef
# Looks like you failed 1 test of 1.
------8<------8<------8<------8<------8<------8<------8<------

--
Olivier Mengué <dolmen@​cpan.org>

[p5pRT]

From [Unknown Contact. See original ticket]

This ticket didn't get much attention.

Le Mar 23 Juin 2015 05​:29​:11, dolmen a écrit :

Hi,

I would like to use next​::method from a method implemented in a role
and injected in a class by aliasing methods.
But it seems next​::method doesn't work in that case​: it doesn't find
the super method.

See the attached code for a self contained minimal test case.

Here is the (failing) output​:

------8<------8<------8<------8<------8<------8<------8<------
$ perl next_method.pl
1..1
# perl v5.22.0
Hi2 from Child!
Hi2 from Parent!
Hi2 from Child!
Hi2 from Parent!
Hi from Role!
not ok 1
# Failed test at next_method.pl line 69.
# got​: 'No next​::method 'hello' found for Child at
/home/omengue/.plenv/versions/5.22.0/lib/perl5/5.22.0/x86_64-
linux/mro.pm line 27.
# '
# expected​: undef
# Looks like you failed 1 test of 1.
------8<------8<------8<------8<------8<------8<------8<------

--
Olivier Mengué <dolmen@​cpan.org>

[p5pRT]

From @dur-randir

Hello,

In your script you see details of the current next​::method()
implementation. To get an inheritance chain start, it looks not into
the function location (stash + glob pair), but into it's 'name' -
thing that you can, for example, set with Sub​::Name​::subname().

See this https://gist.github.com/dur-randir/b80000cea918434999be for
some (weird) tricks you can do with it.

Best regards,
Sergey Aleynikov

[p5pRT]

From zefram@fysh.org

This behaviour of next​::method is called out in a "Caveat" segment of the
"mro" documentation. There is no bug here, and not even a documentation
deficiency.

-zefram

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