cyrus-lang/Cyrus

Remove exit_with_single_diag! from lexer and add more resilience when it faces an invalid char

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#409 opened on Jul 13, 2026

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Research direction
Investigate the macro exit with single diag! in the lexer, remove it, and implement graceful error handling or recovery for invalid characters.
Tech stack
rust
Domain
compilers
Issue type
Refactor
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.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75