Announcing Rust 1.96.0
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New Rust release with incremental features; actionable upgrade, strong community, but not core to reader's AI/cloud focus.
Rust 1.96.0 stabilizes core::range types from RFC 3550 — Range, RangeFrom, RangeTo, RangeInclusive (with public fields) — which implement IntoIterator and are Copy, enabling storing slice accessors in Copy types without splitting start and end. The new assert_matches! and debug_assert_matches! macros are stabilized but excluded from the prelude to avoid collisions with popular crates. WebAssembly targets now fail on undefined symbols by default (previously allowed), and two CVEs (CVE-2026-5223 medium, CVE-2026-5222 low) for third-party registries are patched.
- Update to Rust 1.96.0 and consider adopting new range types in public APIs to future-proof code, and enable RUSTFLAGS=-Clink-arg=--allow-undefined if you need the old WASM behavior.
For engineers building reliable infrastructure and WebAssembly targets, the new range types eliminate a common footgun in safe Rust, while the stricter WASM linker catches configuration errors earlier.