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🦋 Welcome to the MAIN() IRC channel of the Raku Programming Language (raku.org). Log available at irclogs.raku.org/raku/live.html . If you're a beginner, you can also check out the #raku-beginner channel! Set by lizmat on 6 September 2022. |
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| xinming | github.com/jonathanstowe/Attribute-Lazy <--- Is this "feature" moved core? | 09:41 | |
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| antononcube | Does anyone have / know Raku Docker images (or specs from them) that have “DB:Pg” and “DB::SQLite” installed ? | 12:15 | |
| lizmat | xinming: not sure what your question is ? | 12:22 | |
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| xinming | lizmat: I saw in stackoverflow, someone said, Attribute::Lazy thing may be moved to core, So I'm not sure. | 12:53 | |
| lizmat | m: class A { has $.a is lazy } | 12:54 | |
| camelia | ===SORRY!=== Error while compiling <tmp> Can't use unknown trait 'is' -> 'lazy' in an attribute declaration. at <tmp>:1 expecting any of: rw readonly box_target leading_docs trailing_do… |
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| lizmat | guess not :-*( | ||
| xinming | lizmat: BTW, I think I found a bug, not sure it's bug in DBIish or core | ||
| !paste | |||
| ?paste | |||
| lizmat | we usually use something like gist.github.com | 12:55 | |
| ab5tract | any pastebin will do, of course | 12:56 | |
| xinming | pastebin.com/KnicMGC0 <--- With this script, We'll get eror | 12:58 | |
| Cannot look up attributes in a VMNull type object. Did you forget a '.new'? | |||
| in block <unit> at raku-will-l | |||
| in block <unit> at raku-will-lazy-bug.raku line 10 | |||
| lizmat | m: class A { has $.a will lazy } | 12:59 | |
| camelia | ===SORRY!=== Error while compiling <tmp> Missing block at <tmp>:1 ------> class A { has $.a will lazy ⏏} expecting any of: block or pointy block |
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| lizmat | m: class A { has $.a will lazy { "foo" } } | ||
| camelia | ===SORRY!=== Error while compiling <tmp> Can't use unknown trait 'will' -> 'lazy' in an attribute declaration. at <tmp>:1 expecting any of: lazy |
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| xinming | We need Attribute::Lazy | ||
| lizmat | m: class A { has $.a will lazy({ "foo" }) } | ||
| camelia | ===SORRY!=== Error while compiling <tmp> Missing block at <tmp>:1 ------> class A { has $.a will lazy⏏({ "foo" }) } expecting any of: block or pointy block |
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| xinming | I think Attribute::Lazy is still not in core yet. | ||
| lizmat | it most definitely is not | 13:00 | |
| xinming | But I don't think it's probably a Attribute::Lazy bug, Probably DBIish uses c bindings caused some bugs | ||
| Some c bindings affected the core. | |||
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| lizmat | xinming: could you post a --ll-exception backtrace? | 13:02 | |
| ab5tract | xiinming: does it work as expected with a less complex thingy inside the lazy block? `has $.re will lazy { /foo/ }` or such? | ||
| lizmat | golf: use Attribute::Lazy; class A { has $.a; has $.b will lazy { $!a } }; A.new.b | 13:03 | |
| xinming | pastebin.com/F4UdBcVk | ||
| lizmat | Cannot look up attributes in a VMNull type object. Did you forget a '.new'? | ||
| xinming | lizmat: yea, this is the shortest code to trigger the bug | 13:04 | |
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| xinming | So it's a bug in Attribute::Lazy? | 13:04 | |
| lizmat | m: class A { }; use nqp; nqp::getattr(nqp::null, A, '$!') | 13:07 | |
| camelia | Cannot look up attributes in a VMNull type object. Did you forget a '.new'? in block <unit> at <tmp> line 1 |
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| lizmat | that's basically the error | ||
| looking at the generated QAST, it generates a nqp::getattr(self, A, '$!') | 13:08 | ||
| *but* no self is known in the "lazy" block | |||
| use Attribute::Lazy; class A { has $.a; has $.b will lazy { self } }; dd A.new.b # Mu | 13:09 | ||
| so there *is* a "self" known in that scope, it's just that it isn't getting set | 13:10 | ||
| xinming: but I did find a workaround | 13:12 | ||
| use Attribute::Lazy; class A { has $.a = 42; has $.b will lazy -> $self { $self.a } }; dd A.new.b | 13:13 | ||
| ^^ | |||
| xinming: the $self is just for clarity, it could be named anything | 13:14 | ||
| actually, a better workaround; | |||
| use Attribute::Lazy; class A { has $.a = 42; has $.b will lazy { .a } }; dd A.new.b # 42 | |||
| the object *is* available as the topic inside the block, so instead of: $!dbh.prepare("SELECT 1"); | 13:15 | ||
| you should do: .dbi.prepare("SELECT 1"); | 13:16 | ||
| that's even one char less | |||
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| ab5tract | that's really interesting actually. It might be a cool exercise to rewrite Attribute::Lazy in RakuAST | 13:21 | |
| lizmat | or just add it to core and allow: has $.b will lazy *.a | ||
| as syntax | |||
| xinming | thanks | 13:25 | |
| Yea, I think `-> $self` is more clear version | |||
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| tbrowder | m: my $x = "\n"; say ($x ~~ /\n/).so | 15:26 | |
| camelia | True | ||
| tbrowder | my $x = '\n'; say ($x ~~ /\n/).so | 15:27 | |
| evalable6 | False | ||
| tbrowder | m: my $x = '\t'; say ($x ~~ /\t/).so | 15:29 | |
| camelia | False | ||
| tbrowder | m: my $x = "\t"; say ($x ~~ /\t/).so | 15:30 | |
| camelia | True | ||
| tbrowder | reality check. " vs ' with special chars and ~~ | 15:31 | |
| hm, which quoting construct enables the equiv of ["\n", "\t"] without entering the double quotes? | 15:49 | ||
| m: my @a = qq[ \n \t]; say @a.gist | 15:50 | ||
| camelia | [ ] |
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| tbrowder | m: my @a = qq[\n]; say (@a[0] ~~ /\n/).so | 15:52 | |
| camelia | True | ||
| tbrowder | looks like that's what i'm looking for | 15:53 | |
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| tbrowder | nope, not quite it... | 16:05 | |
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