Macro wrap_v8_interceptor 

macro_rules! wrap_v8_interceptor {
    ($ vis : vis struct $ name : ident ; impl V8Interceptor { $ ($ (# [$ attrs_name : meta]) * fn $ method_name : ident (& $ self : ident $ (, $ arg_name : ident : $ arg_type : ty) * $ (,) ?) $ (-> $ return_type : ty) ? { $ ($ body : tt) * }) * }) => { ... };
    ($ vis : vis struct $ name : ident $ (< $ ($ generic_type : ident : $ first_generic_type_bound : tt $ (+ $ generic_type_bound : tt) *) , + $ (,) ? >) ? { $ ($ field_vis : vis $ field_name : ident : $ field_type : ty) , * $ (,) ? } impl V8Interceptor { $ ($ (# [$ attrs_name : meta]) * fn $ method_name : ident (& $ self : ident $ (, $ arg_name : ident : $ arg_type : ty) * $ (,) ?) $ (-> $ return_type : ty) ? { $ ($ body : tt) * }) * }) => { ... };
}

Implement the WrapV8Interceptor trait for the specified struct. You can declare more members for your struct, and in the impl V8Interceptor block you can override default methods implemented by the ImplV8Interceptor trait.

Example

wrap_v8_interceptor! {
    struct MyV8Interceptor {
        payload: String,
    }

    impl V8Interceptor {
        // ...
    }
}

fn make_my_struct() -> V8Interceptor {
    MyV8Interceptor::new("payload".to_string())
}