#[autoprops_component] panics instead of making a proper error

[kirillsemyonkin]

As of writing, yew-autoprops uses panic!() macro to display errors to the user. This, however, is not intended and causes jarring error:

#[autoprops_component]
pub fn Example(i: u32) -> Html {
    html! {}
}

#[function_component]
pub fn App() -> Html {
    html! {
        <Example i={ 0 } />
    }
}

Error:

custom attribute panicked
message: Invalid argument: i : u32 (must be a reference)

Possible Solutions

• Generate compile_error!() instead of panic!()ing, this should cause a proper simple error to be displayed to the user of the library.
• In future, as Rust features stabilize, consider using Diagnostic API.