Macro casttest

macro_rules! casttest {
    ($(#[$attr:meta])* $test:ident, $($async:ident)? |$prj:ident, $cmd:ident| $e:expr) => { ... };
    ($(#[$attr:meta])* $test:ident, $style:expr, |$prj:ident, $cmd:ident| $e:expr) => { ... };
    ($(#[$attr:meta])* $test:ident, $style:expr, async |$prj:ident, $cmd:ident| $e:expr) => { ... };
}