diff --git a/crates/base-db/src/lib.rs b/crates/base-db/src/lib.rs
index 28931676ee..c2ab950648 100644
--- a/crates/base-db/src/lib.rs
+++ b/crates/base-db/src/lib.rs
@@ -50,7 +50,7 @@ pub trait FileLoader {
     /// Text of the file.
     fn file_text(&self, file_id: FileId) -> Arc<str>;
     fn resolve_path(&self, path: AnchoredPath<'_>) -> Option<FileId>;
-    fn relevant_crates(&self, file_id: FileId) -> Arc<FxHashSet<CrateId>>;
+    fn relevant_crates(&self, file_id: FileId) -> Arc<[CrateId]>;
 }
 
 /// Database which stores all significant input facts: source code and project
@@ -85,19 +85,20 @@ pub trait SourceDatabaseExt: SourceDatabase {
     #[salsa::input]
     fn source_root(&self, id: SourceRootId) -> Arc<SourceRoot>;
 
-    fn source_root_crates(&self, id: SourceRootId) -> Arc<FxHashSet<CrateId>>;
+    fn source_root_crates(&self, id: SourceRootId) -> Arc<[CrateId]>;
 }
 
-fn source_root_crates(db: &dyn SourceDatabaseExt, id: SourceRootId) -> Arc<FxHashSet<CrateId>> {
+fn source_root_crates(db: &dyn SourceDatabaseExt, id: SourceRootId) -> Arc<[CrateId]> {
     let graph = db.crate_graph();
-    let res = graph
+    graph
         .iter()
         .filter(|&krate| {
             let root_file = graph[krate].root_file_id;
             db.file_source_root(root_file) == id
         })
-        .collect();
-    Arc::new(res)
+        .collect::<FxHashSet<_>>()
+        .into_iter()
+        .collect()
 }
 
 /// Silly workaround for cyclic deps between the traits
@@ -114,7 +115,7 @@ impl<T: SourceDatabaseExt> FileLoader for FileLoaderDelegate<&'_ T> {
         source_root.resolve_path(path)
     }
 
-    fn relevant_crates(&self, file_id: FileId) -> Arc<FxHashSet<CrateId>> {
+    fn relevant_crates(&self, file_id: FileId) -> Arc<[CrateId]> {
         let _p = profile::span("relevant_crates");
         let source_root = self.0.file_source_root(file_id);
         self.0.source_root_crates(source_root)
diff --git a/crates/hir-def/src/test_db.rs b/crates/hir-def/src/test_db.rs
index f4a6b61f7a..c992c3c920 100644
--- a/crates/hir-def/src/test_db.rs
+++ b/crates/hir-def/src/test_db.rs
@@ -8,7 +8,6 @@ use base_db::{
     Upcast,
 };
 use hir_expand::{db::ExpandDatabase, InFile};
-use rustc_hash::FxHashSet;
 use syntax::{algo, ast, AstNode};
 use triomphe::Arc;
 
@@ -76,7 +75,7 @@ impl FileLoader for TestDB {
     fn resolve_path(&self, path: AnchoredPath<'_>) -> Option<FileId> {
         FileLoaderDelegate(self).resolve_path(path)
     }
-    fn relevant_crates(&self, file_id: FileId) -> Arc<FxHashSet<CrateId>> {
+    fn relevant_crates(&self, file_id: FileId) -> Arc<[CrateId]> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
 }
diff --git a/crates/hir-ty/src/test_db.rs b/crates/hir-ty/src/test_db.rs
index 6f4aef22d2..d0a1fb1d57 100644
--- a/crates/hir-ty/src/test_db.rs
+++ b/crates/hir-ty/src/test_db.rs
@@ -9,7 +9,6 @@ use base_db::{
 use hir_def::{db::DefDatabase, ModuleId};
 use hir_expand::db::ExpandDatabase;
 use nohash_hasher::IntMap;
-use rustc_hash::FxHashSet;
 use syntax::TextRange;
 use test_utils::extract_annotations;
 use triomphe::Arc;
@@ -81,7 +80,7 @@ impl FileLoader for TestDB {
     fn resolve_path(&self, path: AnchoredPath<'_>) -> Option<FileId> {
         FileLoaderDelegate(self).resolve_path(path)
     }
-    fn relevant_crates(&self, file_id: FileId) -> Arc<FxHashSet<CrateId>> {
+    fn relevant_crates(&self, file_id: FileId) -> Arc<[CrateId]> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
 }
diff --git a/crates/hir/src/symbols.rs b/crates/hir/src/symbols.rs
index 841ddfb9c4..9ae5bb2693 100644
--- a/crates/hir/src/symbols.rs
+++ b/crates/hir/src/symbols.rs
@@ -165,6 +165,7 @@ impl<'a> SymbolCollector<'a> {
         // Record renamed imports.
         // FIXME: In case it imports multiple items under different namespaces we just pick one arbitrarily
         // for now.
+        // FIXME: This parses!
         for id in scope.imports() {
             let source = id.import.child_source(self.db.upcast());
             let Some(use_tree_src) = source.value.get(id.idx) else { continue };
diff --git a/crates/ide-db/src/lib.rs b/crates/ide-db/src/lib.rs
index 79531936fd..eae23e9548 100644
--- a/crates/ide-db/src/lib.rs
+++ b/crates/ide-db/src/lib.rs
@@ -124,7 +124,7 @@ impl FileLoader for RootDatabase {
     fn resolve_path(&self, path: AnchoredPath<'_>) -> Option<FileId> {
         FileLoaderDelegate(self).resolve_path(path)
     }
-    fn relevant_crates(&self, file_id: FileId) -> Arc<FxHashSet<CrateId>> {
+    fn relevant_crates(&self, file_id: FileId) -> Arc<[CrateId]> {
         FileLoaderDelegate(self).relevant_crates(file_id)
     }
 }