1 use crate::definitions::{DefKey, DefPathData, DisambiguatedDefPathData};
2 use rustc_span::def_id::{DefPathHash, StableCrateId};
5 fn def_path_hash_depends_on_crate_id() {
6 // This test makes sure that *both* halves of a DefPathHash depend on
7 // the crate-id of the defining crate. This is a desirable property
8 // because the crate-id can be more easily changed than the DefPath
9 // of an item, so, in the case of a crate-local DefPathHash collision,
10 // the user can simply "role the dice again" for all DefPathHashes in
11 // the crate by changing the crate disambiguator (e.g. via bumping the
12 // crate's version number).
14 let id0 = StableCrateId::new("foo", false, vec!["1".to_string()]);
15 let id1 = StableCrateId::new("foo", false, vec!["2".to_string()]);
17 let h0 = mk_test_hash(id0);
18 let h1 = mk_test_hash(id1);
20 assert_ne!(h0.stable_crate_id(), h1.stable_crate_id());
21 assert_ne!(h0.local_hash(), h1.local_hash());
23 fn mk_test_hash(stable_crate_id: StableCrateId) -> DefPathHash {
24 let parent_hash = DefPathHash::new(stable_crate_id, 0);
28 disambiguated_data: DisambiguatedDefPathData {
29 data: DefPathData::CrateRoot,
34 key.compute_stable_hash(parent_hash)