lamdera / lamdera/compiler

Broken codegen

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Dominant language
Haskell
Stars
95
Forks
21
PR merge metrics
No merged PRs in 30d

Description

From https://discord.com/channels/654415002224295940/1387196923881984023/1387200070558027876, we have an issue with codegen.

recursive1Arg n =
    if n then
        recursive1Arg (not n)

    else
        False
var $author$project$Elm$Review$Main$recursive1Arg = function (n) {
    recursive1Arg:
    while (true) {
        if (n) {
            var $temp$n = !n;
            n = $temp$n;
        } else {
            return false;
        }
    }
};

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the Elm recursive1Arg example and inspecting the generated JavaScript shown in the issue. Trace the compiler's code-generation path for this recursive tail call; done means the generated JavaScript correctly represents the Elm behavior without the broken recursive reference.

Written by the indexing model from the issue text.

Assessment

Tech stack
elm, haskell
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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