error[E0277]: the trait bound `core::ops::Fn() -> bool + 'static: core::marker::Sized` is not satisfied
   --> /home/whitequark/Work/artiq-dev/artiq/artiq/runtime/../runtime.rs/src/sched.rs:109:16
    |
109 |     Completion(*const (Fn() -> bool + 'static)),
    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/home/whitequark/Work/artiq-dev/artiq/artiq/runtime/../runtime.rs/src/sched.rs:107:10: 107:15 note: in this expansion of #[derive(Debug)] (defined in /home/whitequark/Work/artiq-dev/artiq/artiq/runtime/../runtime.rs/src/sched.rs)
    |
    = note: `core::ops::Fn() -> bool + 'static` does not have a constant size known at compile-time
    = note: required because of the requirements on the impl of `core::fmt::Debug` for `*const core::ops::Fn() -> bool + 'static`
    = note: required because of the requirements on the impl of `core::fmt::Debug` for `&*const core::ops::Fn() -> bool + 'static`
    = note: required for the cast to the object type `core::fmt::Debug`