Macro namable_closures::regulate

macro_rules! regulate {
    (|| ref $c:ident) => { ... };
    (|$arg:ident| ref $c:ident) => { ... };
    (|$arg1:ident,$($arg2:ident),+| ref $c:ident) => { ... };
    (|| mut $c:ident) => { ... };
    (|$arg:ident| mut $c:ident) => { ... };
    (|$arg1:ident,$($arg2:ident),+| mut $c:ident) => { ... };
    (|| $c:ident) => { ... };
    (|$arg:ident| $c:ident) => { ... };
    (|$arg1:ident,$($arg2:ident),+| $c:ident) => { ... };
}