Though trait objects like dyn EventsHandler erase the type at runtime, they still need to have information about the lifetime of the type so that it can be used in the type system. Lifetime annotations enable you to tell the borrow checker how long references are valid for. PTIJ Should we be afraid of Artificial Intelligence? These'll be solved over This crate provides an attribute macro to make async fn in traits work. For more details, see the tracking issue on In-band lifetime bindings. deprecated to leave off the lifetime parameters for non-reference-types (types The syntax '_ asks the compiler to infer the appropriate lifetime based on context, we had to use this syntax in the above example because all lifetimes are anonymous and don't have names outside of generic contexts. the reference we take to data has to survive for 'b. Launching the CI/CD and R Collectives and community editing features for How to include ::Blocknumber in a struct within a Substrate FRAME pallet, the trait `_embedded_hal_digital_InputPin` is not implemented for `PE2