[BUG] emoji crashed claude twice

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I'm not so experienced using Claude and am deep into a project. Was having it do some research and testing and it crashed twice in a row. I showed the second crash message that appeared in white below the prompt line and Claude said it was due to a emoji being used in a to do. list for my testing of Clauds research. This is the text:

thread '<unnamed>' (431761) panicked at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/str/mod.rs:833:21:
byte index 3 is not a char boundary; it is inside '📋' (bytes 0..4) of 📋 Test Instructions
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5, aborting
zsh: abort claude
peterstephenson@Peters-Mac-mini Musitude %

What Should Happen?

Claude was researching sound files and setting up a local host fo rme to test them on. As it generated a list of checks to make with an emoji it should have let me just go to the local host and do the testing.

Error Messages/Logs

thread '<unnamed>' (431761) panicked at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library/core/src/str/mod.rs:833:21:
byte index 3 is not a char boundary; it is inside '📋' (bytes 0..4) of `📋 Test Instructions`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5, aborting
zsh: abort      claude
peterstephenson@Peters-Mac-mini Musitude %

Steps to Reproduce

,

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code version: 2.0.76

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_