Rust's Provenance APIs Let You Tell the Compiler Exactly What You Mean

Pointer Provenance in Rust vs. C++: Pointers Are Not Just Glorified Ints

Pointer provenance is the hidden compiler bookkeeping that tracks which allocation a pointer came from, and it's why Clang can optimize away a reload of a local even when an opaque function receives a pointer. Casting a pointer to an integer in C++ exposes that provenance and forces the optimizer to give up. Rust's addr(), with_addr(), and without_provenance() let you state your intent explicitly, and Miri enforces the rules.