Macro lang_extension::as_boxed

macro_rules! as_boxed {
    ($trait:tt) => { ... };
    ($trait:tt<$($param:tt), *>) => { ... };
    (impl $trait:tt) => { ... };
    (impl $trait:tt<$($param:tt), *>) => { ... };
    (impl Hash for $trait:tt) => { ... };
    (impl Hash for $trait:tt<$($param:tt), *>) => { ... };
    (impl Hash for $trait:tt<$($param:tt: $constraint:tt), *>) => { ... };
    (impl PartialEq for $trait:tt) => { ... };
    (impl PartialEq for $trait:tt<$($param:tt), *>) => { ... };
    (impl PartialEq for $trait:tt<$($param:tt: $contraint:tt), *>) => { ... };
    (impl Eq for $trait:tt) => { ... };
    (impl Eq for $trait:tt<$($param:tt), *>) => { ... };
    (impl Eq for $trait:tt<$($param:tt: $contraint:tt), *>) => { ... };
    (impl Clone for $trait:tt) => { ... };
    (impl Clone for $trait:tt<$($param:tt), *>) => { ... };
    (impl Clone for $trait:tt<$($param:tt: $constraint:tt), *>) => { ... };
}