rtk-ai/rtk

Add rust-version to Cargo.toml (MSRV = 1.91)

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#1402 opened on Apr 19, 2026

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effort-smallenhancementgood first issue

Description

v0.37.1 uses str::floor_char_boundary() in src/cmds/system/pipe_cmd.rs:135, which was stabilized in Rust 1.91.0.

Without rust-version in Cargo.toml, building with Rust < 1.91 fails with a confusing error:

error[E0658]: use of unstable library feature `round_char_boundary`
 --> src/cmds/system/pipe_cmd.rs:135:21
  |
135 | let end = input.floor_char_boundary(end);
    |                 ^^^^^^^^^^^^^^^^^^^

Adding rust-version = "1.91" to [package] in Cargo.toml would give a clear error message at build time instead:

error: package `rtk v0.37.1` cannot be built because it requires rustc 1.91 or newer

This affects distribution packagers (e.g., Arch Linux AUR) where the system Rust version may lag behind.

Contributor guide

Tech stack
rust
Domain
build system
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
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.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Rust development environmentKnowledge of Cargo.toml
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
95
Research direction
The issue requests adding a `rust version` field to `Cargo.toml` in the `[package]` section. The value should be `"1.91"` because the code uses `str::floor char boundary()` which was stabilized in Rust 1.91.0 and is used in `src/cmds/system/pipe cmd.rs:135`. This change will provide a clear error message for users with older Rust versions. No additional code changes are needed.