Stream: beginners

Topic: roc hangs with multiple packages

Luke Boswell (Oct 13 2022 at 07:07):

I added a new issue #4319 for importing multiple packages. Currently roc hangs with both roc check and roc run for the following. I am not sure if this is is a supported feature, or perhaps I am not using the packages and imports correctly.

app "hangs"
    packages { pf: "cli-platform/main.roc", ps: "Parser.roc" }
    imports [
        pf.Program.{ Program },
        pf.Stdout,
        ps.Parser.{ Parser },
    ]
    provides [main] to pf

main : Program
main =
    Stdout.line "This code hangs due to Parser.roc package"
    |> Program.quick

Anton (Oct 13 2022 at 07:39):

I've replied on the github issue.

Luke Boswell (Oct 13 2022 at 09:04):

Ahk thank you. Do you think it would be worthwhile if I add this into the tutorial docs? Also, is it an issue that it hangs? I would have expected a helpful error message.

Brendan Hansknecht (Oct 13 2022 at 13:36):

Roc hanging or crashing without a useful error message is always an issue. May not be top priority, but they are paramount to the long term experience.

Anton (Oct 13 2022 at 18:02):

This would indeed be good to add to the tutorial @Luke Boswell :)

Luke Boswell (Oct 13 2022 at 20:25):

Updated TUTORIAL.md and created PR #4320.

Last updated: Jul 26 2025 at 12:14 UTC