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| Anton Antonov | I am trying to redirect stderr to a custom $err. I am have this code: | 11:10 | |
| ``` | |||
| my Str $err = ''; | |||
| my $*ERR = $*ERR but role { | |||
| method print (*@args) { | |||
| $err ~= @args | |||
| } | |||
| } | |||
| ``` | |||
| Which worked before I updated to Raku 2022.04. Now I get the error: "Cannot resolve caller print(Any:U: BOOTStr); none of these signatures matches: (Mu: *%_)" | 11:11 | ||
| How can I fix this? | 11:12 | ||
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| MasterDuke | Anton Antonov: i don't get that error running just the code you pasted. is there more required to trigger it? | 16:10 | |
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| Anton Antonov | MasterDuke -- Ok, I will try to give an example. | 17:16 | |
| MasterDuke -- Ok, I will try to give an example that has the error. | |||
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| piotrklibert | How come `[Z]` or `(1, 2) Z (2, 3) Z (3, 4)` work? Reduce over zip also works: `reduce(&zip, [(1, 2), (2, 3), (3, 4)])` Again, how come? | 19:20 | |
| Semantically, all these should be reducible to: `zip( zip( (1, 2), (2, 3) ), (3, 4) )` which does give the result I'd expect: `(((1 2) 3) ((2 3) 4))`. Same for `((1, 2) Z (2, 3)) Z (3, 4)` so I was suspecting some operator precedence magic, but reduce/zip makes me think it's a special case in the `zip` multi (if it's a multi). This should be equivalen to `[Z]`, too, yet isn't: | |||
| ``` | |||
| > dd my @a = reduce(-> @a, @b { say "acc={@a.raku}, el={@b.raku}, ret=" ~ (my @r = @a Z @b).raku; @r}, [(1, 2), (2, 3), (4, 5)]) | |||
| acc=(1, 2), el=(2, 3), ret=[(1, 2), (2, 3)] | |||
| acc=[(1, 2), (2, 3)], el=(4, 5), ret=[($(1, 2), 4), ($(2, 3), 5)] | |||
| Array @a = [($(1, 2), 4), ($(2, 3), 5)] | |||
| ``` | |||
| What am I missing? | |||
| Something about nodality, or scalar vs. array contexts, maybe? | 19:22 | ||
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| gfldex | m: &reduce.candidates[0].signature.say; # bot? you there? | 19:29 | |
| MasterDuke | m: &reduce.candidates[0].signature.say; | 19:30 | |
| camelia | (&with, +list) | ||
| gfldex | <@486998692683841566> see docs.raku.org/language/functions#S...onventions "single argument rule" | 19:31 | |
| piotrklibert | Ah, this again... 😄 Ok, thanks, I think it's finally time to actually understand that section instead of just reading it 🙂 | 19:35 | |
| Morfent | slurpy oneargs are pretty handy | 19:37 | |
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| Anton Antonov | MasterDuke, I use(d) Test::Output to capture the error output -- works fine. The complication was coming from using my crude approach inside a Cro routing service. | 20:17 | |
| Nemokosch | I don't see much "single argument" here, how is this related? | 21:41 | |
| I only see a question about associativity and Z has the so called list associativity | |||
| So neither left nor right, it acts like one function expanding to several arguments | 21:42 | ||
| docs.raku.org/language/operators#O...ociativity | 21:45 | ||
| <@486998692683841566> docs.raku.org/language/functions#Associativity you can do this, too :) | 21:47 | ||
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