Macro closure::closure

macro_rules! closure {
    (move || $f:expr) => { ... };
    (move |$($arg:ident $(: $t:ty)*),*| $f:expr) => { ... };
    (move |$($arg:ident $(: $t:ty)*),*| $f:expr) => { ... };
    (|| $f:expr) => { ... };
    (|$($arg:ident),*| $f:expr) => { ... };
    (@inner || $f:expr) => { ... };
    (@inner |$($arg:ident),*| $f:expr) => { ... };
    (@inner move $var:ident $($tail:tt)*) => { ... };
    (@inner ref mut $var:ident $($tail:tt)*) => { ... };
    (@inner ref $var:ident $($tail:tt)*) => { ... };
    (@inner clone $var:ident $($tail:tt)*) => { ... };
    (@inner , $($tail:tt)*) => { ... };
    ($($args:tt)*) => { ... };
}