You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/actix-web/actix-web/src/guard
    
    the code of the file until where you have to start completion: //! Route guards.
//!
//! Guards are used during routing to help select a matching service
    
    fn check(&self, ctx: &GuardContext<'_>) -> bool {
        for guard in &self.guards {
            if !guard.check(ctx) {
                return false;
            }
        }

        true
    }