Use `Symbol` for the crate name instead of `String`/`str`

1 files changed, 5 insertions, 3 deletions

diff --git a/compiler/rustc_span/src/def_id.rs b/compiler/rustc_span/src/def_id.rs
index f5555846d20..b122bd0722d 100644
--- a/compiler/rustc_span/src/def_id.rs
+++ b/compiler/rustc_span/src/def_id.rs
@@ -1,4 +1,4 @@
-use crate::HashStableContext;
+use crate::{HashStableContext, Symbol};
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
 use rustc_data_structures::AtomicRef;
@@ -149,9 +149,11 @@ impl StableCrateId {
 
     /// Computes the stable ID for a crate with the given name and
     /// `-Cmetadata` arguments.
-    pub fn new(crate_name: &str, is_exe: bool, mut metadata: Vec<String>) -> StableCrateId {
+    pub fn new(crate_name: Symbol, is_exe: bool, mut metadata: Vec<String>) -> StableCrateId {
         let mut hasher = StableHasher::new();
-        crate_name.hash(&mut hasher);
+        // We must hash the string text of the crate name, not the id, as the id is not stable
+        // across builds.
+        crate_name.as_str().hash(&mut hasher);
 
         // We don't want the stable crate ID to depend on the order of
         // -C metadata arguments, so sort them: