Macro redhook::hook

macro_rules! hook {
    (unsafe fn $real_fn:ident ( $($v:ident : $t:ty),* ) -> $r:ty => $hook_fn:ident $body:block) => { ... };
    (unsafe fn $real_fn:ident ( $($v:ident : $t:ty),* ) => $hook_fn:ident $body:block) => { ... };
}