Rust 1.85-1.93 Knowledge Patch

Claude's baseline knowledge covers Rust through 1.84. This skill provides features from 1.85 (Feb 2025) through 1.93 (Jan 2026).

Quick Reference

Change	Migration
`unsafe extern "C" {}`	Add `unsafe` to extern blocks
`#[unsafe(no_mangle)]`	Wrap unsafe attrs in `unsafe()`
`unsafe {}` in unsafe fns	Explicit unsafe blocks required
`static mut` denied	Use atomics/sync primitives
`gen` reserved	Rename identifiers
`set_var`/`remove_var` unsafe	Wrap in `unsafe {}`

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First Seen

Jan 26, 2026