1 files changed, 2 insertions, 2 deletions
diff --git a/cache/src/lib.rs b/cache/src/lib.rs
index 52245d6..115741c 100644
--- a/cache/src/lib.rs
+++ b/cache/src/lib.rs
@@ -127,10 +127,10 @@ thread_local! { pub static WITHIN_CACHE_FILE: AtomicBool = const { AtomicBool::n
 pub fn cache_file<Fun>(
     kind: &str,
     key: impl Hash,
-    mut generate: Fun,
+    generate: Fun,
 ) -> Result<CachePath, anyhow::Error>
 where
-    Fun: FnMut(std::fs::File) -> Result<(), anyhow::Error>,
+    Fun: FnOnce(std::fs::File) -> Result<(), anyhow::Error>,
 {
     let (bucket, location) = cache_location(kind, key);
     let loc_abs = location.abs();