Sverre Winkelmans (Dec 12 2024 at 07:00): Sverre Winkelmans (Dec 12 2024 at 07:00):I've been wanting to try out Roc for advent of code. I use the Roc template on github for aoc.
But I run in an error:
roc build 01.roc
thread '<unnamed>' panicked at crates/compiler/mono/src/ir.rs:6246:56:
calledOption::unwrap()on aNonevalue
note: run withRUST_BACKTRACE=1environment variable to display a backtrace
If I use roc check 01.rocI get 0 errors and 0 warnings. I'm using the latest nightly and also tried with: roc_nightly-old_linux_x86_64-2024-12-11-d746e2a
My code:
app [main] {
pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.17.0/lZFLstMUCUvd5bjnnpYromZJXkQUrdhbva4xdBInicE.tar.br",
aoc: "https://github.com/lukewilliamboswell/aoc-template/releases/download/0.2.0/tlS1ZkwSKSB87_3poSOXcwHyySe0WxWOWQbPmp7rxBw.tar.br"
}
import pf.Stdin
import pf.Stdout
import pf.Utc
import aoc.AoC {
stdin: Stdin.readToEnd,
stdout: Stdout.write,
time: \{} -> Utc.now {} |> Task.map Utc.toMillisSinceEpoch,
}
main =
AoC.solve {
year: 2024,
day: 1,
title: "Historian Hysteria",
part1,
part2,
}
sampleData =
"""
3 4
4 3
2 5
1 3
3 9
3 3
"""
asIntegers = \data ->
dbg data
left =
data
|> List.first
|> Result.withDefault "0"
|> Str.toI32
|> Result.withDefault 0
right =
data
|> List.last
|> Result.withDefault "0"
|> Str.toI32
|> Result.withDefault 0
dbg (left, right)
parseInput = \data ->
data
|> Str.splitOn "\n"
|> dbg
|> List.map (\line -> Str.splitOn line " ")
|> dbg
|> List.map asIntegers
|> List.walk {left : [], right: []} \t, (l,r) -> { t & left : List.append t.left l, right: List.append t.right r}
solve1 = \input ->
left = List.sortAsc input.left
right = List.sortAsc input.right
List.map2 left right (\x,y -> Num.abs (Num.sub x y))
|> List.sum
solve2 = \input ->
input.left
|> List.walk 0 \s,a -> s + (a * (Num.toI32 (List.countIf input.right \b -> a == b )))
## Implement your part1 and part1 solutions here
part1 : Str -> Result Str _
part1 = \input ->
input
|> parseInput
|> solve1
|> Num.toStr
|> Ok
part2 : Str -> Result Str _
part2 = \input ->
input
|> parseInput
|> solve2
|> Num.toStr
|> Ok
expect (part2 sampleData) == Ok "33"
expect (part1 sampleData) == Ok "11"
does it work if you remove the dbgs? I have seen them sometimes causing this kind of issue.
Sverre Winkelmans (Dec 12 2024 at 07:05):@Brendan Hansknecht Just tried but the problem remains.
Brendan Hansknecht (Dec 12 2024 at 07:06):interestingly roc test runs
Brendan Hansknecht (Dec 12 2024 at 07:16):A more minimal repro seems to be this.
app [main] {
pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.17.0/lZFLstMUCUvd5bjnnpYromZJXkQUrdhbva4xdBInicE.tar.br",
aoc: "https://github.com/lukewilliamboswell/aoc-template/releases/download/0.2.0/tlS1ZkwSKSB87_3poSOXcwHyySe0WxWOWQbPmp7rxBw.tar.br",
}
import pf.Stdin
import pf.Stdout
import pf.Utc
import aoc.AoC {
stdin: Stdin.readToEnd,
stdout: Stdout.write,
time: \{} -> Utc.now {} |> Task.map Utc.toMillisSinceEpoch,
}
main =
AoC.solve {
year: 2024,
day: 1,
title: "Historian Hysteria",
part1,
part2,
}
part1 = \_ ->
crash "testing"
part2 = \_ ->
crash "testing"
quite confused as to why it is failing and how no one else has run into this
Sverre Winkelmans (Dec 12 2024 at 07:17):I was able to run it before. It only stopped working when I tried for part2.
Jon Erik Kemi Warghed (Dec 12 2024 at 07:18):Yes change the signature to Result Str Str in part1
Brendan Hansknecht (Dec 12 2024 at 07:19):Also doesn't look to be a new regression. Still can repro on a commit from mid october
Jon Erik Kemi Warghed (Dec 12 2024 at 07:20):https://github.com/lukewilliamboswell/aoc-template/issues/8
Sverre Winkelmans (Dec 12 2024 at 07:23):@Jon Erik Kemi Warghed Thanks! Indeed specifing the error case instead of _ make it compile!
Last updated: Jul 26 2025 at 12:14 UTC