Rust macro error

struct.rs

macro_rules! serializable {
    (
        $(#[$struct_meta:meta])*
        pub struct $name:ident {
            $(
                $(#[$field_meta:meta]) *
                $field:ident: $type_:ty
            ),* ,
        }
    ) => {
        $(#[$struct_meta])*
        pub struct $name {
            $(
                $(#[$field_meta]) *
               $field: $type_
            ),* ,
        }
    }
}

serializable! {
  #[allow(dead_code)]
  /// This is a test
  pub struct Tester {
    #[allow(dead_code)]
    name: String,
  }
}

Gives the error:

error: local ambiguity: multiple parsing options: built-in NTs ident ('field') or 1 other option.
src\util\serialization.rs:180             #[allow(dead_code)]

removing the #[allow(dead_code)] above name: String works