Different error messages between roc dev and roc test · beginners

I've created an issue to track something that I have found confusing. Issue #4242. I get different error messages sometimes between roc dev and roc test. I'm not sure if my workflow is right, but I find I am running roc dev and roc test after each time I change my code.

Luke Boswell (Oct 07 2022 at 23:48):

Also found another related issue that crashed the formatter. Filed another issue #4343.

Luke Boswell (Oct 07 2022 at 23:49):

Please let me know if I'm raising issues that are helpful. Any feedback to improve my issues would be appreciated.

jan kili (Oct 08 2022 at 05:18):

Richard Feldman (Oct 08 2022 at 06:26):

Chris Duncan (Oct 09 2022 at 13:24):

I was about to bring this up. Thanks @Luke Boswell :raised_hands: I was encountering the same confusing result. BTW, are we keeping track of unhelpful error messages? Something like what Elm does?

Chris Duncan (Oct 09 2022 at 14:52):

Several times already I've mistakenly used = instead of == in the expect function.

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: LoadingProblem(FormattedReport("\u{1b}[36m── ARGUMENTS BEFORE EQUALS ───────────────────────────────────────── mainA.roc ─\u{1b}[0m\n\nI am partway through parsing a definition, but I got stuck here:\n\n \u{1b}[36m1\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mapp \"day-03A-2021\"\u{1b}[0m\n \u{1b}[36m2\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37m    packages { pf: \"../../../../open-source-forks/roc/examples/cli/cli-platform/main.roc\" }\u{1b}[0m\n \u{1b}[36m3\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37m    imports [Main.{ Bit, ReportLine, Report }, pf.Program.{ Program }]\u{1b}[0m\n \u{1b}[36m4\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37m    provides [main] to pf\u{1b}[0m\n \u{1b}[36m5\u{1b}[0m\u{1b}[36m│\u{1b}[0m\n \u{1b}[36m6\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mmain : Program\u{1b}[0m\n \u{1b}[36m7\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mmain = Main.run getAnswer\u{1b}[0m\n \u{1b}[36m8\u{1b}[0m\u{1b}[36m│\u{1b}[0m\n \u{1b}[36m9\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mgetAnswer : Report -> Nat\u{1b}[0m\n\u{1b}[36m10\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mgetAnswer = \\report ->\u{1b}[0m\n\u{1b}[36m11\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37m    reportLineAcc = List.walk report [] walkReport\u{1b}[0m\n\u{1b}[36m12\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37m    {gamma, epsilon} = getRates reportLineAcc\u{1b}[0m\n\u{1b}[36m13\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37m    (toDecimal gamma) * (toDecimal epsilon)\u{1b}[0m\n\u{1b}[36m14\u{1b}[0m\u{1b}[36m│\u{1b}[0m\n\u{1b}[36m15\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mReportLineAcc : List (Dict Bit Nat)\u{1b}[0m\n\u{1b}[36m16\u{1b}[0m\u{1b}[36m│\u{1b}[0m\n\u{1b}[36m17\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mwalkReport : ReportLineAcc, ReportLine -> ReportLineAcc\u{1b}[0m\n\u{1b}[36m18\u{1b}[0m\u{1b}[36m│\u{1b}[0m\n\u{1b}[36m19\u{1b}[0m\u{1b}[36m│\u{1b}[0m  \u{1b}[37mexpect walkReport [] [One, Zero, One, One, Zero] = [Dict.single One 1, Dict.single Zero 1, Dict.single One 1, Dict.single One 1, Dict.single Zero 1]\u{1b}[0m\n                       \u{1b}[31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\u{1b}[0m\n\nLooks like you are trying to define a function. In roc, functions are\nalways written as a lambda, like \u{1b}[33mincrement = \\n -> n + 1\u{1b}[0m."))', crates/cli/src/lib.rs:392:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

── ARGUMENTS BEFORE EQUALS ───────────────────────────────────────── mainA.roc ─

I am partway through parsing a definition, but I got stuck here:

 1│  app "day-03A-2021"
 2│      packages { pf: "../../../../open-source-forks/roc/examples/cli/cli-platform/main.roc" }
 3│      imports [Main.{ Bit, ReportLine, Report }, pf.Program.{ Program }]
 4│      provides [main] to pf
 5│
 6│  main : Program
 7│  main = Main.run getAnswer
 8│
 9│  getAnswer : Report -> Nat
10│  getAnswer = \report ->
11│      reportLineAcc = List.walk report [] walkReport
12│      {gamma, epsilon} = getRates reportLineAcc
13│      (toDecimal gamma) * (toDecimal epsilon)
14│
15│  ReportLineAcc : List (Dict Bit Nat)
16│
17│  walkReport : ReportLineAcc, ReportLine -> ReportLineAcc
18│
19│  expect walkReport [] [One, Zero, One, One, Zero] = [Dict.single One 1, Dict.single Zero 1, Dict.single One 1, Dict.single One 1, Dict.single Zero 1]
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Looks like you are trying to define a function. In roc, functions are
always written as a lambda, like increment = \n -> n + 1.%

Richard Feldman (Oct 09 2022 at 15:26):

we don't have a centralized place for confusing error messages at the moment, but definitely please open an issue on the repo any time you find one confusing!

Chris Duncan (Oct 09 2022 at 17:00):

I just saw that y'all have the error-messages label in the GitHub Issues. That's a sufficient way of grouping these messages we want to improve. I created an issue, but someone will need to add the label to it.

Stream: beginners

Topic: Different error messages between roc dev and roc test

Luke Boswell (Oct 07 2022 at 23:30):