error[E0623]: lifetime mismatch --> $DIR/ref-mut-struct.rs:11:9 | LL | fn ref_Struct(self: &mut Struct, f: &u32) -> &u32 { | ---- ---- | | | this parameter and the return type are declared with different lifetimes... LL | f | ^ ...but data from `f` is returned here error[E0623]: lifetime mismatch --> $DIR/ref-mut-struct.rs:15:9 | LL | fn box_ref_Struct(self: Box<&mut Struct>, f: &u32) -> &u32 { | ---- ---- | | | this parameter and the return type are declared with different lifetimes... LL | f | ^ ...but data from `f` is returned here error[E0623]: lifetime mismatch --> $DIR/ref-mut-struct.rs:19:9 | LL | fn pin_ref_Struct(self: Pin<&mut Struct>, f: &u32) -> &u32 { | ---- ---- | | | this parameter and the return type are declared with different lifetimes... LL | f | ^ ...but data from `f` is returned here error[E0623]: lifetime mismatch --> $DIR/ref-mut-struct.rs:23:9 | LL | fn box_box_ref_Struct(self: Box>, f: &u32) -> &u32 { | ---- ---- | | | this parameter and the return type are declared with different lifetimes... LL | f | ^ ...but data from `f` is returned here error[E0623]: lifetime mismatch --> $DIR/ref-mut-struct.rs:27:9 | LL | fn box_pin_ref_Struct(self: Box>, f: &u32) -> &u32 { | ---- ---- | | | this parameter and the return type are declared with different lifetimes... LL | f | ^ ...but data from `f` is returned here error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0623`.