Fix

src/lib.rs

@@ -84,12 +84,21 @@ impl Allocator {
         unsafe { GC_gcollect() }
     }
 
-    pub unsafe fn register_finalizer(ptr: *const c_void, finalizer: impl FnOnce(*mut c_void)) {
+    pub unsafe fn register_finalizer(
+        ptr: *const c_void,
+        finalizer: impl FnOnce(*mut c_void) + 'static,
+    ) {
         unsafe extern "C" fn finalize<F: FnOnce(*mut c_void)>(ptr: *mut c_void, data: *mut c_void) {
             (*(data as *mut F))(ptr)
         }
 
-        GC_register_finalizer(ptr, finalize::<F>, &mut finalizer, null(), null());
+        GC_register_finalizer(
+            ptr,
+            finalize::<F>,
+            &mut &finalizer as *const _ as *const _,
+            null(),
+            null(),
+        );
     }
 }