error[E0308]: mismatched types --> $DIR/object-lifetime-default-from-rptr-box-error.rs:25:12 | LL | ss.t = t; //~ ERROR mismatched types | ^ lifetime mismatch | = note: expected type `&'a std::boxed::Box<(dyn Test + 'static)>` found type `&'a std::boxed::Box<(dyn Test + 'a)>` note: the lifetime 'a as defined on the function body at 24:6... --> $DIR/object-lifetime-default-from-rptr-box-error.rs:24:6 | LL | fn c<'a>(t: &'a Box, mut ss: SomeStruct<'a>) { | ^^ = note: ...does not necessarily outlive the static lifetime error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.