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lucs This raises the reasonable and understandable error "Illegally post-declared type Baz...": 18:07
class Jub::Foo {has $.baz = Baz.new}; class Baz {}
But the following raises no complaints, and having a similar structure in my code is leading to problems which I can't understand and which I am having trouble to golf down, sorry:
class Baz::Foo {has $.baz = Baz.new}; class Baz {}
What's up with that?
[Coke] m: class Baz::Foo {has $.baz = Baz.new}; dd Baz 18:08
camelia Baz
lucs I think I can fix my problem by using the canonical solution to the "Doctor, it hurts when I do this." 18:11
problem.
But I don't get it.
ugexe something like class Baz::Foo creates an empty Baz
lucs Oh, huh. 18:12
ugexe m: class Foo::Bar { }; say ::("Foo")
camelia (Foo)
ugexe m: class FooX::Bar { }; say ::("Foo")
camelia No such symbol 'Foo'
in block <unit> at <tmp> line 1
lucs I'll see if changing the order of my declarations fixes things, or maybe report a more understandable error. 18:14
Voldenet Baz in the case of `class Baz::Foo { has $.baz = Baz.new; }` is a package 18:41
so it's correct identifier
m: class Baz::Foo { has $.baz = Baz.new }; say Baz.HOW; # relevant example 18:43
camelia Perl6::Metamodel::PackageHOW.new
Voldenet but it becomes a ClassHOW in runtime 18:44
if you define a class
m: class Baz::Foo { has $.baz = Baz.new }; BEGIN say Baz.HOW; say Baz.HOW; class Baz {}
camelia Perl6::Metamodel::PackageHOW.new
Perl6::Metamodel::ClassHOW.new
Voldenet it kinda makes sense but perhaps stubbing the class for sanity reasons is a good idea 18:45
m: class Baz { … }; class Baz::Foo { has $.baz = Baz.new }; BEGIN say Baz.HOW; say Baz.HOW; class Baz {}
camelia Perl6::Metamodel::ClassHOW.new
Perl6::Metamodel::ClassHOW.new
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Voldenet in which case if you forgot or misdeclare the class, you'll get an error instead of silent runtime errors 18:53
m: class Baz { … }; class Baz::Foo { has $.baz = Baz.new }; BEGIN say Baz.HOW; say Baz.HOW; # relevant example 18:54
camelia Perl6::Metamodel::ClassHOW.new
The following packages were stubbed but not defined:
Baz
Voldenet keep in mind that this behavior is rakudo-specific - mutsu and rakupp treat Baz as class always, so I'm not sure if that's specified 18:56
lucs Voldenet: Wow. That's pretty advanced stuff for the little I understand of Raku's metatmodel. 19:17
Thanks for the explanation anyway, I'm copy/pasting it for future reference when I'm a bit more knowledgeable :-) 19:18
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Voldenet it's all implementation-specific and boils down to "pre-define class for extra sanity" :> 19:19
lucs Yep :-) 19:20
Anyway, turns out my real problem was something else, which I now have managed to golf down and will gist momentarily. 19:22
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lucs Bah, no gist necessary. 20:35
Turns out my grammar was using an actions class that had an attribute of the same name as one of the grammar rules, 'foo', apparently colliding with the actions method of the same name, whether or not the actions class defines that method or not.
Took me a while to figure out because the error I was getting was "Too many positionals passed; expected 1 argument but got 2", reported at the 'Foo.new' line here: `class Actions {... has $.foo = Foo.new; ...}`. 20:36
My class Foo had no 'new' method, so I'm not sure what that "2 arguments" is about.
Anyway, simply changing the name of the rule fixed it.
lizmat if the attribute was public ($.foo) it would create an accessor method in the Actions class 20:37
so unless you defined a method by that name in the actions class, it would call that accessor method
lucs Makes sense, but why the "2 arguments"? 20:38
lizmat since the accessor method only takes one argument (the invocant), and the grammar calls the method with $/ as the positional argument
lucs Aaah. 20:39
lizmat the accessor was called with $action.foo($/) which is 2 args
lucs Gotcha.
lizmat guess I should add an extra check in raku.land/zef:lizmat/actions for that 20:40
lucs Oh, interesting concept there. 20:41
[Coke] when constructing a raku script to use in a command pipeline, is there a way to avoid Failed to write 96 bytes to filehandle: Broken pipe 21:07
(and a huge backtrace) 21:08
Voldenet for more bearable error maybe prefix it with `try` 21:21
and for absolutely no error `$*OUT.out-buffer = 0; try { … }` 21:25
(though it's slower)
hm, there's another way that practically works… 21:31
but it's awful # use NativeCall; sub _exit(int32) is native { * }; try { … }; _exit(0)
I've checked that prefixing any code with just `use NativeCall; sub _exit(int32) is native { * }; LEAVE _exit(0);` works on my box 21:42
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Voldenet but I've failed to package it into a module and it's not really nice way to exit a process anyway 21:44
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