Why is every error message the same?

1

Hi,
I’m checking out ReScript, and I followed the installation steps. Everything has worked fine so far, except for one thing: every single error message I get is the same:

Fatal error: exception Invalid_argument("index out of bounds")

No matter what I try (unused variables, typos, incorrect syntax), the error is the same.
Why is this? How can I fix it?

1 Like
2

Hello. Do you have a repro? Editor, project template, code?

3

Editor: VSCode (and using the rescript-vscode plugin)

Project Template: GitHub - rescript-lang/rescript-project-template: Clone this repo to start your own project! (

code:

// Comment this line out to get a vague error:
let lst = list{ ..."a,b,c" }

let result = (x => x)(lst)

bsconfig.json:

{
  "name": "rescript-project-template",
  "version": "0.0.1",
  "sources": {
    "dir" : "src",
    "subdirs" : true
  },
  "package-specs": {
    "module": "es6",
    "in-source": true
  },
  "suffix": ".bs.js",
  "bs-dependencies": [
  ],
  "warnings": {
    "error" : "+101"
  }
}
4

P.S. I do sometimes see Warning number <n> in the error.
And I finally found the list of warning numbers: OCaml - Batch compilation (ocamlc)
This helps a lot, but it would still be better to have the errors in plain English rather than code number IMO.

5

Could you try rescript clean and rebuild? It’s weird that you’re getting this error

6

I did it, but still the same thing

7

terminal:

PS C:\Users\ronald\Desktop\rescript-project-template> npm run clean

> rescript-project-template@0.0.1 clean C:\Users\ronald\Desktop\rescript-project-template
> rescript clean -with-deps

Cleaning... 2 files.
PS C:\Users\ronald\Desktop\rescript-project-template> npm run clean2

> rescript-project-template@0.0.1 clean2 C:\Users\ronald\Desktop\rescript-project-template
> rescript clean

PS C:\Users\ronald\Desktop\rescript-project-template> npm run build 

> rescript-project-template@0.0.1 build C:\Users\ronald\Desktop\rescript-project-template
> rescript

rescript: [3/3] src/Main.cmj
FAILED: src/Main.cmj

  Warning number 26
  C:\Users\ronald\Desktop\rescript-project-template\src\Main.res:99:7
Fatal error: exception Invalid_argument("index out of bounds")
FAILED: cannot make progress due to previous errors.
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! rescript-project-template@0.0.1 build: `rescript`
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the rescript-project-template@0.0.1 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\ronald\AppData\Roaming\npm-cache\_logs\2021-05-20T09_29_45_947Z-debug.log

debug log:

0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli   'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'run',
1 verbose cli   'build'
1 verbose cli ]
2 info using npm@6.14.11
3 info using node@v14.16.0
4 verbose run-script [ 'prebuild', 'build', 'postbuild' ]
5 info lifecycle rescript-project-template@0.0.1~prebuild: rescript-project-template@0.0.1
6 info lifecycle rescript-project-template@0.0.1~build: rescript-project-template@0.0.1
7 verbose lifecycle rescript-project-template@0.0.1~build: unsafe-perm in lifecycle true
8 verbose lifecycle rescript-project-template@0.0.1~build: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;C:\Users\ronald\Desktop\rescript-project-template\node_modules\.bin;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\Haskell\bin;C:\Program Files\Haskell Platform\8.6.3\lib\extralibs\bin;C:\Program Files\Haskell Platform\8.6.3\bin;C:\Program Files\Haskell Platform\8.6.3\mingw\bin;C:\Program Files\PuTTY\;C:\Program Files (x86)\ChucK\/bin;C:\Program Files\Git\bin\;C:\Program Files\Git\cmd\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Microsoft VS Code\bin;C:\Program Files (x86)\GTK2-Runtime\bin;C:\Program Files\nodejs\;C:\Program Files (x86)\Elm\0.19.1\bin;C:\Users\ronald\AppData\Roaming\cabal\bin;C:\Users\ronald\AppData\Roaming\local\bin;C:\Program Files\nodejs;C:\Users\ronald\AppData\Local\now-cli;C:\Users\ronald\AppData\Local\Microsoft\WindowsApps;C:\Gradle\gradle-6.6.1\bin;C:\Program Files\Java\jdk-11.0.8\bin\bin;C:\Users\ronald\AppData\Roaming\npm
9 verbose lifecycle rescript-project-template@0.0.1~build: CWD: C:\Users\ronald\Desktop\rescript-project-template
10 silly lifecycle rescript-project-template@0.0.1~build: Args: [ '/d /s /c', 'rescript' ]
11 silly lifecycle rescript-project-template@0.0.1~build: Returned: code: 2  signal: null
12 info lifecycle rescript-project-template@0.0.1~build: Failed to exec build script
13 verbose stack Error: rescript-project-template@0.0.1 build: `rescript`
13 verbose stack Exit status 2
13 verbose stack     at EventEmitter.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:332:16)
13 verbose stack     at EventEmitter.emit (events.js:315:20)
13 verbose stack     at ChildProcess.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at ChildProcess.emit (events.js:315:20)
13 verbose stack     at maybeClose (internal/child_process.js:1048:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:288:5)
14 verbose pkgid rescript-project-template@0.0.1
15 verbose cwd C:\Users\ronald\Desktop\rescript-project-template
16 verbose Windows_NT 10.0.19042
17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "build"
18 verbose node v14.16.0
19 verbose npm  v6.14.11
20 error code ELIFECYCLE
21 error errno 2
22 error rescript-project-template@0.0.1 build: `rescript`
22 error Exit status 2
23 error Failed at the rescript-project-template@0.0.1 build script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 2, true ]

Let me know if you need any other info

8

@chenglou I believe this problem happens on windows. Happened to my friend too (on windows) but i couldn’t reproduce this on my machines (windows/linux)

9

can you just run npx rescript, what’s the output?
I could not reproduce your case on windows

10

output: rescript: [6/6] src/Main.cmj

11

so it just works, seems to be an editor error.

Fatal error: exception Invalid_argument("index out of bounds")

The error message suggests it is a native exception. cc @cristianoc

12

@JomoPipi it is a bit weird, is not npm run build exactly the same as npx rescript? what’s the output of running npm run build from terminal?

13

@Hongbo In case the source code has no errors compiler compiles successfully. Seems like it raises when it wants to print error messages. something like that.

14

Ah, sorry. I edited my code between then and when I ran npx rescript. But I ran it on my mac and I see much more helpful error messages now

15

Something weird here on Windows, now: My editor is giving the error even though I’m seeing Finish compiling in the terminal.

image
image871×447 20.7 KB

16

Can you disable the plugin first and see if you can reproduce it by tweaking the code and see if there is warnings?

18

I disabled the plugin and restarted my editor:
image

19

@JomoPipi Can you try this and show the output?

in cmd before running your build command, enter this command SET OCAMLRUNPARAM=b and hit enter, then run your build command.

20

image

21

I think set is not working on powerhsell try that on cmd if possible.