- Language overhaul adds iterator‑based for loops, removes the copy keyword (use Clone), introduces a new FFI model with extern "C" fn and fixed‑stack wrappers, enforces new safety and visibility rules, adds default methods, SIMD arithmeti...
- Standard library transitions to a new Rust‑written runtime, adds experimental rt::io, new std::c_str and CString utilities, checked arithmetic, DoubleEndedIterator, vector split, MemoryMap, more atomic types, and introduces/renames many ...
- Tooling upgrades include rustc target‑cpu support, improved debug info, faster small‑crate compilation, rustpkg git‑tag packages and cross‑compile dirs, test harness metrics, man pages for all tools, and the new rustdoc_ng documentation ...
Rust 0.8
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Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.