| error[E0393]: the type parameter `T` must be explicitly specified | 
 |   --> $DIR/E0393.rs:3:47 | 
 |    | | 
 | LL | trait A<T=Self> {} | 
 |    | --------------- type parameter `T` must be specified for this | 
 | LL | | 
 | LL | fn together_we_will_rule_the_galaxy(son: &dyn A) {} | 
 |    |                                               ^ | 
 |    | | 
 |    = note: because the parameter default references `Self`, the parameter must be specified on the object type | 
 | help: set the type parameter to the desired type | 
 |    | | 
 | LL | fn together_we_will_rule_the_galaxy(son: &dyn A<T>) {} | 
 |    |                                                +++ | 
 |  | 
 | error: aborting due to 1 previous error | 
 |  | 
 | For more information about this error, try `rustc --explain E0393`. |