Error E0301 "the parameter type T may not live long enough" could explain where the lifetime requirement comes from #33652
Description
Error E0301 "the parameter type T may not live long enough" could explain where the lifetime requirement comes from.
Here's some example code where the T: 'static requirement comes implicitly from a Box<Trait> trait object (so 'static is invisible).
trait Funny { } fn new_funny_handle<T: Funny + Default>() -> Box<Funny> { Box::new(T::default()) }error: the parameter type `T` may not live long enough [--explain E0310] --> <anon>:5:5 5 |> Box::new(T::default()) |> ^^^^^^^^^^^^^^^^^^^^^^ help: consider adding an explicit lifetime bound `T: 'static`... note: ...so that the type `T` will meet its required lifetime bounds --> <anon>:5:5 5 |> Box::new(T::default()) |>