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Warning about $. when using metamethod #6303

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p6rt opened this issue Jun 1, 2017 · 6 comments
Closed

Warning about $. when using metamethod #6303

p6rt opened this issue Jun 1, 2017 · 6 comments

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@p6rt
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@p6rt p6rt commented Jun 1, 2017

Migrated from rt.perl.org#131478 (status was 'resolved')

Searchable as RT131478$

@p6rt
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@p6rt p6rt commented Jun 1, 2017

From @Juerd

code​:

  class Command { method Str { "<$.^name>" } }
  # or even just​:
  class Command { method Str { $.^name } }

gives​:

  Unsupported use of $. variable; in Perl 6 please use the .kv method on e.g. .lines

workaround​:

  self.^names

00​:41 < Juerd> "Unsupported use of $. variable; in Perl 6 please use the .kv method on e.g. .lines" when trying $.^name instead of self.^name; bug or my mistake?
00​:50 < AlexDaniel> Juerd​: bug.
00​:53 < AlexDaniel> Juerd​: I think this is where you would fix it​:
https://github.com/rakudo/rakudo/blob/8e0d000fbbe1a1430695ac5dbed5bce505d89a05/src/Perl6/Grammar.nqp#L2080-L2083  00​:54 < AlexDaniel> like, maybe this​: !before ‘^’? \w 00​:55 < Juerd> Mind if I copy/paste that into a ticket? 00​:55 < AlexDaniel> sure

--
Met vriendelijke groet, // Kind regards, // Korajn salutojn,

Juerd Waalboer <juerd@​tnx.nl>
TNX

@p6rt
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@p6rt p6rt commented Oct 7, 2017

From @skids

On Thu, 01 Jun 2017 16​:07​:41 -0700, juerd@​tnx.nl wrote​:

code​:

class Command { method Str { "<$.^name>" } }
# or even just​:
class Command { method Str { $.^name } }

gives​:

Unsupported use of $. variable; in Perl 6 please use the .kv method on
e.g. .lines

workaround​:

self.^names

00​:41 < Juerd> "Unsupported use of $. variable; in Perl 6 please use
the .kv method on e.g. .lines" when trying $.^name
instead of self.^name; bug or my mistake?
00​:50 < AlexDaniel> Juerd​: bug.
00​:53 < AlexDaniel> Juerd​: I think this is where you would fix it​:
https://github.com/rakudo/rakudo/blob/8e0d000fbbe1a1430695ac5dbed5bce505d89a05/src/Perl6/Grammar.nqp#L2080-
L2083
00​:54 < AlexDaniel> like, maybe this​: !before ‘^’? \w
00​:55 < Juerd> Mind if I copy/paste that into a ticket?
00​:55 < AlexDaniel> sure

That syntax simply hadn't been implemented yet.

PR rakudo/rakudo#1178 submitted to implement it.

Note that a side-effect of that PR is that even when you are not in a class,
you have to use e.g. ($).^mro if you want to introspect an in-place
anonymous variable... which is probably not something many people would
ever want to do, so not a big deal.

@p6rt
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@p6rt p6rt commented Oct 7, 2017

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

@p6rt
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@p6rt p6rt commented Nov 17, 2017

From @AlexDaniel

I'm guessing that this now needs tests?

On 2017-10-07 07​:35​:53, bri@​abrij.org wrote​:

On Thu, 01 Jun 2017 16​:07​:41 -0700, juerd@​tnx.nl wrote​:

code​:

class Command { method Str { "<$.^name>" } }
# or even just​:
class Command { method Str { $.^name } }

gives​:

Unsupported use of $. variable; in Perl 6 please use the .kv method
on
e.g. .lines

workaround​:

self.^names

00​:41 < Juerd> "Unsupported use of $. variable; in Perl 6 please use
the .kv method on e.g. .lines" when trying $.^name
instead of self.^name; bug or my mistake?
00​:50 < AlexDaniel> Juerd​: bug.
00​:53 < AlexDaniel> Juerd​: I think this is where you would fix it​:
https://github.com/rakudo/rakudo/blob/8e0d000fbbe1a1430695ac5dbed5bce505d89a05/src/Perl6/Grammar.nqp#L2080-
L2083
00​:54 < AlexDaniel> like, maybe this​: !before ‘^’? \w
00​:55 < Juerd> Mind if I copy/paste that into a ticket?
00​:55 < AlexDaniel> sure

That syntax simply hadn't been implemented yet.

PR rakudo/rakudo#1178 submitted to implement
it.

Note that a side-effect of that PR is that even when you are not in a
class,
you have to use e.g. ($).^mro if you want to introspect an in-place
anonymous variable... which is probably not something many people
would
ever want to do, so not a big deal.

@p6rt
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@p6rt p6rt commented Dec 11, 2017

@p6rt
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@p6rt p6rt commented Dec 11, 2017

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

@p6rt p6rt closed this Dec 11, 2017
@p6rt p6rt added the testneeded label Jan 5, 2020
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