Macro cached::cached_control

macro_rules! cached_control {
    ($cachename:ident : $cachetype:ty = $cacheinstance:expr ;
     Key = $key:expr;
     PostGet($cached_value:ident) = $post_get:expr;
     PostExec($body_value:ident) = $post_exec:expr;
     Set($set_value:ident) = $pre_set:expr;
     Return($ret_value:ident) = $return:expr;
     fn $name:ident ($($arg:ident : $argtype:ty),*) -> $ret:ty = $body:expr) => { ... };
}