gleam-lang/gleam

Same warning printed twice

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#3,899 opened on Nov 26, 2024

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help wanted

Description

My list.concat deprecation warning is being printed twice for the same line/occurrence.

warning: Deprecated value used
    ┌─ /Users/js/Desktop/scream/src/scream.gleam:101:12
    │
101 │     |> list.concat
    │            ^^^^^^^ This value has been deprecated

It was deprecated with this message: Use `list.flatten` instead.

warning: Deprecated value used
    ┌─ /Users/js/Desktop/scream/src/scream.gleam:101:12
    │
101 │     |> list.concat
    │            ^^^^^^^ This value has been deprecated

It was deprecated with this message: Use `list.flatten` instead.

Reproduction

git clone git@github.com:okkdev/scream.git
cd scream/
git checkout dfde544ea477f2e2c27732596c1ab1397612cf41
gleam build

Versions

  • Gleam 1.6.1
  • macOS 14.6.1
  • javascript and erlang target

Log

log.txt

Contributor guide

Tech stack
rust
Domain
tooling
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic Rust knowledgeCompiler warning system familiarity
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the deprecation warning emission logic in the Gleam compiler. Look for where warnings are generated and printed, likely in the compiler's diagnostic or warning module. Check for duplicate emission paths, possibly due to the warning being emitted for both the Erlang and JavaScript compilation targets. The issue includes reproduction steps; use them to trace the warning flow. Review comments in the issue for any pointers to specific files or functions.