gleam-lang/gleam

LSP code action to discard unused variable

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#4,950 opened on Sep 9, 2025

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 (10 comments) (0 reactions) (0 assignees)Rust (960 forks)batch import
help wanted

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Description

Hi 👋 I'm not sure if I'm using the right term but I think it could be useful to add a code action that appends _ to a label in a pattern match to ignore it. There's already a hint for this case but it would be neat to quickly fix the issue via a code action. I added a screenshot to illustrate what I mean.

Contributor guide

Research direction
Investigate the Gleam LSP code actions implementation and add a new code action that automatically prepends an underscore to unused variables in pattern matches when triggered.
Tech stack
rust
Domain
developer experience
Issue type
Feature
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.
1-3 hours
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
RustGleam language knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70