Mutable reference should be used with an FnMut type

src/revwalk.rs

@@ -157,7 +157,7 @@ impl<'repo> Revwalk<'repo> {
  /// the walk.
  pub fn with_hide_callback<'cb, C>(
  self,
- callback: &'cb C,
+ callback: &'cb mut C,
  ) -> Result<RevwalkWithHideCb<'repo, 'cb, C>, Error>
  where
  C: FnMut(Oid) -> bool,
@@ -170,7 +170,7 @@ impl<'repo> Revwalk<'repo> {
  raw::git_revwalk_add_hide_cb(
  r.revwalk.raw(),
  Some(revwalk_hide_cb::<C>),
- callback as *const _ as *mut c_void,
+ callback as *mut _ as *mut c_void,
  );
  };
  Ok(r)
@@ -304,8 +304,8 @@ mod tests {
  walk.reset().unwrap();
  walk.push_head().unwrap();
 
- let hide_cb = |oid| oid == target;
- let mut walk = walk.with_hide_callback(&hide_cb).unwrap();
+ let mut hide_cb = |oid| oid == target;
+ let mut walk = walk.with_hide_callback(&mut hide_cb).unwrap();
 
  assert_eq!(walk.by_ref().count(), 0);