The value ++ can't be found

[prashantham]

Hi,
I am trying out ReasonML. Did the global installation and bs-platform.
Created the ap using bsb -init my-first-app -theme basic-reason.
But when i try out the examples i get error above.
example: let x = "Hello" ++ "World";

`> [email protected] start /Users/prashanth/workspace/reasonml/my-first-app

bsb -make-world -w

Start compiling
Rebuilding since just get started
ninja: Entering directory lib/bs' ninja: no work to do. Finish compiling Start compiling Rebuilding since [ [ 'change', 'demo.re' ] ] ninja: Entering directory lib/bs'
[2/2] Building src/demo.mlast.d
[1/1] Building src/demo-MyFirstApp.cmj
FAILED: src/demo-MyFirstApp.cmj /Users/prashanth/workspace/reasonml/my-first-app/lib/js/src/demo.js src/demo-MyFirstApp.cmi
/usr/local/lib/node_modules/bs-platform/bin/bsc.exe -bs-package-map my-first-app -bs-package-output commonjs:lib/js/src -bs-assume-no-mli -bs-no-builtin-ppx-ml -bs-no-implicit-include -I . -I src -w -30-40+6+7+27+32..39+44+45+101 -nostdlib -I '/Users/prashanth/workspace/reasonml/my-first-app/node_modules/bs-platform/lib/ocaml' -no-alias-deps -color always -bs-re-out -bs-super-errors -o src/demo-MyFirstApp.cmj -c src/demo.mlast

We've found a bug for you!
(No file name)

The value ++ can't be found

ninja: build stopped: subcommand failed.

Finish compiling(exit: 1)
`

[JohannesKaufmann]

apparently they haven shiped the new syntax yet: reasonml/reason#1445

[relekang]

@prashantham Which version of bs-platform do you have? To be able to use the new syntax you need at least 2.0.0 and set "refmt": 3 in bsconfig.json.

[IwanKaramazow]

@JohannesKaufmann New syntax has been shipped, that issue contains not finished stuff which will be addressed in the future.

[JohannesKaufmann]

@IwanKaramazow well I rencently saw the blog post about the new version and thought about giving it a try. So I followed the getting started guide which gives me "bs-platform": "2.0.0" in the "package.json". But all the new stuff like string concatenation (++ instead of ^) and changing an arrays element (myArray[1] instead of myArray.(1)) doesn't work. Using the old syntax it works :-|

And the error messages are very cryptic (at least for a total beginner):

[1/2] Building src/demo.mlast
FAILED: src/demo.mlast
/Users/johannes/.nvm/versions/node/v8.1.3/lib/node_modules/bs-platform/bin/bsc.exe -pp "/Users/johannes/.nvm/versions/node/v8.1.3/lib/node_modules/bs-platform/bin/refmt.exe --print binary"    -w -30-40+6+7+27+32..39+44+45+101 -nostdlib -I '/Users/johannes/Documents/dev/github/my-second-app/node_modules/bs-platform/lib/ocaml' -no-alias-deps -color always -c -o src/demo.mlast -bs-syntax-only -bs-binary-ast -impl /Users/johannes/Documents/dev/github/my-second-app/src/demo.re
File "/Users/johannes/Documents/dev/github/my-second-app/src/demo.re", line 6, characters 12-13:
Error: 1742: Incomplete statement. Did you forget a ";"?

File "/Users/johannes/Documents/dev/github/my-second-app/src/demo.re", line 1, characters 0-0:
Error: Error while running external preprocessor
Command line: /Users/johannes/.nvm/versions/node/v8.1.3/lib/node_modules/bs-platform/bin/refmt.exe --print binary '/Users/johannes/Documents/dev/github/my-second-app/src/demo.re' > /var/folders/3s/jt7_s0l50h3gc1nhqhghb8zw0000gn/T/ocamlppd6a6f6

ninja: error: rebuilding 'build.ninja': subcommand failed
>>>> Finish compiling(exit: 1)

Do you know how to solve this?

[IwanKaramazow]

Can you upload the project on github & show me the repo?
Little bit hard to guess what's wrong out of the blue.

[JohannesKaufmann]

https://github.com/JohannesKaufmann/reason-first-app

The generated readme.md also mentions to run npm run watch but the command does not exist in the package.json...

[IwanKaramazow]

@JohannesKaufmann You're missing "refmt": 3 in your bsconfig.json.

{
  "name": "my-first-app",
  "version": "0.1.0",
  "sources": [
    "src"
  ],
  "bs-dependencies" : [
      // add your dependencies here. You'd usually install them normally through `npm install my-dependency`. If my-dependency has a bsconfig.json too, then everything will work seamlessly.
  ],
  "namespace": true,
  "refmt": 3 // <-- this was missing
}

npm run build builds your app.
npm start starts a watcher & builds you app automatically on change.

The template hasn't been updated 100% correctly. I'll make sure that won't happen again in the future. Feel free to reach out if you have more trouble.
I'll make a PR to your repo.

[prashantham]

@relekang @IwanKaramazow adding "refmt": 3 worked. Thank you.

[JohannesKaufmann]

Sorry @IwanKaramazow I totally missed that. Thanks for the pull request, it now works without problems.

I really liked the "Syntax Cheatsheet" but I missed a couple of things:

• what type of comments are supported (/* */ vs // vs #)
• converting between data types

The Docs also don't support opening up a link in a new tab if you click on it while holding cmd on a mac.

But other than that the website is really well done and I'm eager to learn more and also try reason-react :-)