1.txt

error[E0308]: mismatched types                                                                                                                                                                                                                     
   --> src/protocols/irc/types.rs:156:16                                                                                                                                                                                                           
    |                                                                                                                                                                                                                                              
156 |           return &self.users                                                                                                                                                                                                                 
    |  ________________^                                                                                                                                                                                                                           
157 | |             .into_iter()                                                                                                                                                                                                                   
158 | |             .map(|x| {                                                                                                                                                                                                                     
159 | |                 return x as &dyn User;                                                                                                                                                                                                     
160 | |             })                                                                                                                                                                                                                             
161 | |             .collect();                                                                                                                                                                                                                    
    | |______________________^ expected struct `std::vec::Vec`, found reference                                                                                                                                                                    
    |                                                                                                                                                                                                                                              
    = note: expected type `std::vec::Vec<&dyn types::user::User>`                                                                                                                                                                                  
               found type `&_`                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                   
warning: trivial cast: `&protocols::irc::types::IRCUser<'_>` as `&dyn types::user::User`                                                                                                                                                           
   --> src/protocols/irc/types.rs:159:24                                                                                                                                                                                                           
    |                                                                                                                                                                                                                                              
159 |                 return x as &dyn User;                                                                                                                                                                                                       
    |                        ^^^^^^^^^^^^^^                                                                                                                                                                                                        
    |                                                                                                                                                                                                                                              
note: lint level defined here                                                                                                                                                                                                                      
   --> src/main.rs:3:9                                                                                                                                                                                                                             
    |                                                                                                                                                                                                                                              
3   | #![warn(trivial_casts)]                                                                                                                                                                                                                      
    |         ^^^^^^^^^^^^^                                                                                                                                                                                                                        
    = help: cast can be replaced by coercion; this might require a temporary variable                                                                                                                                                              
                                                                                          

2.rs

use crate::types::User;

pub trait Room<'a> {
    fn name(&self) -> String;
    fn display_name(&self) -> String;
    fn topic(&self) -> Option<String>;
    fn identifier(&self) -> String;
    fn users(&self) -> Vec<&dyn User>;
    /* FIXME: Icon/avatar? */
}

// ...

impl<'a> Room<'a> for IRCChannel<'a> {
    // ...

    fn users(&self) -> Vec<&dyn User> {
        return &self.users
            .into_iter()
            .map(|x| {
                return x as &dyn User;
            })
            .collect();
    }
}