Macro column_frame

macro_rules! column_frame {
    (@single $($x:tt)*) => { ... };
    (@count $($rest:expr),*) => { ... };
    ($($key:expr => $value:expr,)+) => { ... };
    ($($key:expr => vec![$($value:expr),*]),*) => { ... };
    ($($key:expr => [$($value:expr),*]),*) => { ... };
    ($($key:expr => $value:expr),*) => { ... };
}