#[update] function, error: type annotations needed for `(_, _)`


I am having trouble with a compile error when I specify a structure as an argument to the update function.

[ Error ]

$ cargo build
Compiling encrypted_notes_backend v0.1.0 (/Users/yukasaito/Desktop/git/icp/example_encrypted_notes/src/encrypted_notes_backend)
error[E0282]: type annotations needed for `(_, _)`
   --> src/encrypted_notes_backend/src/lib.rs:113:1
113 | #[update(name = "updateNote")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: this error originates in the attribute macro `update` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider giving this pattern a type, where the placeholders `_` are specified
113 | #[update(name = "updateNote")]: (_, _)
    |                               ++++++++

For more information about this error, try `rustc --explain E0282`.
error: could not compile `encrypted_notes_backend` due to previous error

[ Code ]

#[derive(CandidType, Clone, Debug, Default)]
pub struct EncryptedNote {
    pub id: u128,
    pub encrypted_text: String,

thread_local! {
    static NOTE_STORE: RefCell<BTreeMap<Principal, Vec<EncryptedNote>>> = RefCell::default();
    static ID_STORE: RefCell<u128> = RefCell::new(0);

// ...

#[update(name = "updateNote")]
fn update_note(caller: Principal, update_note: EncryptedNote) {
    NOTE_STORE.with(|note_ref| {
        let mut writer = note_ref.borrow_mut();

        let notes = writer.get_mut(&caller).expect("No user is registered.");

        if let Some(current_note) = notes
            .find(|current_note| current_note.id == update_note.id)
            current_note.encrypted_text = update_note.encrypted_text;

When the content of the structure is directly specified as an argument, there is no problem, but when it is passed as a structure, the error occurs.

The code I am referring to is encrypted-notes-dapp - dfinity/examples (my code is much simpler than this).

If you know how to solve this problem, please let me know.

Thank you in advance.

Rename the second argument to anything other than update_note (the function name) should solve the issue.