This error is easy to get: module: identifier already required ; at: foo ; in: "bar.rkt" It usually means that we are requiring two modules that both provide a binding foo. But which module is “the other one”? Is there a way to get that information?

syntax-sloc has some counting tools, but could use more https://github.com/alexknauth/syntax-sloc

I don’t know of one

but adding it to the error message seems pretty reasonable; the code is here: https://github.com/racket/racket/blob/master/racket/src/expander/expand/require+provide.rkt#L321

I have a code that looks like this:

(current-compile (let ([orig-compile (current-compile)])
                   (lambda (stx im?)
                     (define compiled (orig-compile stx im?))
                     (when (... (syntax-source stx))
                       (with-output-to-file (syntax-source stx) #:exists 'replace
                         (thunk (display compiled))))
                     compiled)))

(dynamic-require ...)

This works fine on a single Racket file, but when the required file has dependencies, I get this message:

hash-ref: no value found for key
  key: 'data
  context...:
   compiled-module->dh+h+data-instance+declaration-instance
   eval-module8
   standard-module-name-resolver
   module-path-index-resolve
   [repeats 1 more time]
   module-declared?

Do you know how to fix the problem?

@mflatt @samth

file: dataset.rkt

#lang racket

(module dataset racket

  (provide lorem-ipsum)

  (define lorem-ipsum (list "a" "b" "c"))

  )

file: main.rkt

#lang racket


(require "dataset.rkt")

lorem-ipsum

why doesn’t this work?

lorem-ipsum: unbound identifier in: lorem-ipsum

@kevinforrestconnors The lorem-ipsum binding isn’t being provided by the dataset.rkt module, it’s being provided by a submodule of the dataset.rkt module. You can require it like this: (require (submod "lorem-ipsum" dataset))

Putting code inside a (module foo ...) form in a file puts it in a submodule named foo. The file itself is already a whole module on its own, assuming you’re using #lang racket or #lang racket/base.

ohh

so if I don’t want to require a submodule, I can just write: (provide lorem-ipsum) (define lorem-ipsum (list "Lorem ipsum dolor"))

it works!

thank you

Does anyone have an example for hsjunnesson ? He wants to embed Racket in a game. https://www.reddit.com/r/Racket/comments/dbbv6a/some_guidance_in_setting_up_racket_as_a_game/

@kevinforrestconnors happy to help!

That really looks like a bug

The relevant code is on line 359 of racket/src/expander/eval/module.rkt

Thanks! Is there any workaround meanwhile?

I don’t know what’s going on so I can’t recommend anything

I think you’re overwriting a file that contains a linklet bundle with just a single modules’ compilation, but really I’m just guessing

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What’s the URL?

https://racket-stories.com

(url? small detail…)

@sorawee The error should be better, but I think the solution is to call orig-compile always with #f as the second argument, because you want to use the result in a way other than immediate evaluation. (Specifically, you want to write it.)

Ah, thanks!

Already creating value for me. I appreciate the Oculus and Papers We Love links, thanks!