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accessing a class attribute too early nils it/leaves it uninitialized #5667

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p6rt opened this issue Sep 13, 2016 · 6 comments
Open

accessing a class attribute too early nils it/leaves it uninitialized #5667

p6rt opened this issue Sep 13, 2016 · 6 comments

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@p6rt
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@p6rt p6rt commented Sep 13, 2016

Migrated from rt.perl.org#129261 (status was 'open')

Searchable as RT129261$

@p6rt
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@p6rt p6rt commented Sep 13, 2016

From @skids

A class attribute accessed too early in the compilation process will get nilled out, or possibly never initialized.

$ perl6 -e 'class A { my $.bar = 42; }; class D { }; A.bar.say' # fine, working
42
$ perl6 -e 'class A { my $.bar = 42; }; class D { constant bar = A.bar.say; }; A.bar.say'
(Any)
(Any)
$ perl6 -e 'class A { my $.bar = 42; }; class D { my $bar = A.bar.say; }; A.bar.say'
42
42
$ perl6 -e 'class A { my Int $.bar = 42; }; class D { constant bar = A.bar.say; }; A.bar.say' # Demonstrate it is typical Nil behavior
(Int)
(Int)

@p6rt
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@p6rt p6rt commented Sep 13, 2016

From @geekosaur

On Mon, Sep 12, 2016 at 11​:40 PM, Brian S. Julin <
perl6-bugs-followup@​perl.org> wrote​:

$ perl6 -e 'class A { my $.bar = 42; }; class D { constant bar =
A.bar.say; }; A.bar.say'
(Any)
(Any)

The first one is expected, as the bodies of class definitions run at
compile time but initializers at run time. I don't know why the second one
happens, though.

--
brandon s allbery kf8nh sine nomine associates
allbery.b@​gmail.com ballbery@​sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

@p6rt
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@p6rt p6rt commented Sep 13, 2016

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

@p6rt
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@p6rt p6rt commented Sep 13, 2016

From @skids

Golf by TimToady​:

(11​:54​:47 PM) TimToady​: m​: class A { my $.bar = 42; }; class D { BEGIN A.bar.say; }; A.bar.say;
(11​:54​:48 PM) camelia​: rakudo-moar 22946e​: OUTPUT«(Any)␤(Any)␤»
(11​:55​:03 PM) TimToady​: m​: class A { my $.bar = 42; }; BEGIN A.bar.say; A.bar.say;
(11​:55​:03 PM) camelia​: rakudo-moar 22946e​: OUTPUT«(Any)␤(Any)␤»

@p6rt
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@p6rt p6rt commented Sep 13, 2016

From @zoffixznet

Slightly golfier (.say is not involved)​:

<Zoffix> m​: class A { my $.bar = 42; }; A.bar; A.bar.say
<camelia> rakudo-moar ee4c96​: OUTPUT«42␤»
<Zoffix> m​: class A { my $.bar = 42; }; BEGIN A.bar; A.bar.say
<camelia> rakudo-moar ee4c96​: OUTPUT«(Any)␤»

@p6rt
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@p6rt p6rt commented Sep 13, 2016

From @zoffixznet

And then this​:

<Zoffix> m​: class A { BEGIN my $.bar = 42; }; BEGIN A.bar; A.bar.say
<camelia> rakudo-moar ee4c96​: OUTPUT«42␤»

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