gleam-lang/gleam

Formatter unnecessarily wraps expressions inside bit array size segments in a block.

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#5,606 建立於 2026年4月11日

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 (3 留言) (0 反應) (1 負責人)Rust (21,417 star) (960 fork)batch import
help wanted

描述

Given this like:

  let slice = <<bits:bits-size(count * marshal_zone_size)-unit(8)>>

The formatter will modify it to:

  let slice = <<bits:bits-size({ count * marshal_zone_size })-unit(8)>>

Even though the original is less than 80 characters wide.

貢獻者指南

技術棧
rust
領域
developer experience
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
2
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
active
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Gleam syntax basicsRust programmingAST manipulation
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
70
研究方向
Start by looking at the formatter code in the `compiler core/src/format.rs` file (or similar). Identify where bit array size expressions are handled. The issue shows that when the expression is under 80 characters, it should not be wrapped in braces. Check the condition that triggers the wrapping, and modify it to account for line length. Review the test suite for formatting to ensure no regressions. There are 3 comments on the issue, so read those for any additional context.
Formatter unnecessarily wraps expressions inside bit array size segments in a block. · gleam-lang/gleam#5606 | Good First Issue