I’m trying to do the iced rust tutorial (from the book) but i encountered a compiling error hen i tried to make a button:

use iced::widget::button;

fn main() {
  let mut counter = Counter { value: 0 };
  counter.update(Message::Increment);
  counter.update(Message::Increment);
  counter.update(Message::Decrement);

  let inc = button("+");
  let dec = button("-");
  
}


struct Counter{
  value: i64,
}

impl Counter{
  fn update(&mut self, msg:Message){
    match msg{
      Message::Increment=>{
        self.value +=1;
      }
      Message::Decrement=>{
        self.value -=1;
      }
    }
  }
}

enum Message{
  Increment,
  Decrement,
}

In particular the line let inc = button("+"); make this error:

   Compiling note v0.1.0 (/home/gattolfo/Documents/rust/note)
error[E0283]: type annotations needed for `iced::widget::Button<'_, _, _, _>`
   --> src/main.rs:12:7
    |
12  |   let inc = button("+");
    |       ^^^   ----------- type must be known at this point
    |
    = note: cannot satisfy `_: iced::widget::button::DefaultStyle`
    = help: the following types implement trait `iced::widget::button::DefaultStyle`:
              Theme
              iced::Color
              iced::widget::button::Appearance
note: required by a bound in `button`
   --> /home/gattolfo/.cargo/git/checkouts/iced-f01cba4d5e61fd0a/cdb18e6/widget/src/helpers.rs:120:12
    |
116 | pub fn button<'a, Message, Theme, Renderer>(
    |        ------ required by a bound in this function
...
120 |     Theme: button::DefaultStyle + 'a,
    |            ^^^^^^^^^^^^^^^^^^^^ required by this bound in `button`
help: consider giving `inc` an explicit type, where the type for type parameter `Theme` is specified
    |
12  |   let inc: iced::widget::Button<'_, Message, Theme, Renderer> = button("+");
    |          ++++++++++++++++++++++++++++++++++++++++++++++++++++

For more information about this error, try `rustc --explain E0283`.
error: could not compile `note` (bin "note") due to 1 previous error

What i’m doing wrong? I’m not able to find other on the book.