Struct rustc_hir::def_id::StableCrateId

pub struct StableCrateId(u64);

A StableCrateId is a 64 bit hash of (crate-name, crate-disambiguator). It is to CrateNum what DefPathHash is to DefId. It is stable across compilation sessions.

Since the ID is a hash value there is a (very small) chance that two crates end up with the same StableCrateId. The compiler will check for such collisions when loading crates and abort compilation in order to avoid further trouble.

Layout

Note: Most layout information is completely unstable and may be different between compiler versions and platforms. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes