Feature: guard function with input parameters

[0kenx]

It would be useful for the guard function to support input parameters. For example, a guard function can be defined as

enum Role {
    Admin,
    User,
}
fn has_role(role: Role) -> Result<(), String>

and the corresponding guard would be #[update(guard = "has_role(Admin)")]

[benjizhai]

I have implemented this in my Rustic crate's modifiers macro https://docs.rs/rustic/0.1.6/rustic/attr.modifiers.html

[0kenx]

Oh that looks nice, thanks!

[sesi200]

We're now collecting feature requests over here: https://dx.internetcomputer.org/topic/199