Macro oatie::doc

macro_rules! doc {
    ( @str_literal $e:expr ) => { ... };
    ( @kind DocText $b:expr $(,)* ) => { ... };
    ( @kind DocText { $( $e:expr ),+  $(,)* } , $b:expr $(,)* ) => { ... };
    ( @kind DocGroup $b:expr , [ $( $v:tt )* ] $(,)* ) => { ... };
    ( @span $( $i:ident ( $( $v:tt )+ ) ),+ $(,)* ) => { ... };
    ( ) => { ... };
    ( $( $v:tt )+ ) => { ... };
}