Macro bare_dyn

bare_dyn!() { /* proc-macro */ }

Shorthand for a BareFn* type taking a boxed closure.

Essentially,

type MyBareFnMut = bare_dyn!("C", FnMut(&u32) -> u32 + Send);

becomes

type MyBareFnMut = BareFnMut<
    unsafe extern "C" fn(&u32) -> u32,
    Box<dyn FnMut(&u32) -> u32 + Send>
>;

If desired, the JIT allocator used by the BareFn* closure wrapper can also be specified by passing it as a third parameter.