axum-core-version-migration

This skill is the migration reference for moving an Axum project from version 0.7 to version 0.8. Axum 0.7.0 released 2023-11-27; Axum 0.8.0 released 2024-12-02. The upgrade has one panic-at-startup change (path syntax) and several compile-time changes. Every breaking change is mechanical and individually verifiable.

When To Use This Skill

• Bumping axum = "0.7" to axum = "0.8" in Cargo.toml
• An Axum app that ran on 0.7 panics at startup after the version bump
• Code stopped compiling after cargo update -p axum
• A custom extractor no longer compiles (the #[async_trait] change)
• WebSocket code fails to compile (the Message payload type change)
• Deciding whether a path string or example targets 0.7 or 0.8

Quick Reference