Macro combine::dispatch_inner

macro_rules! dispatch_inner {
    ($expr_ident: ident [$first_ident: ident $($id: ident)*] [$($collected: tt)*] $($pat: pat)|+ => $expr: expr, $($rest_alt: tt)*) => { ... };
    ($expr_ident: ident [$($id: ident)*] [$($collected: tt)*]) => { ... };
    ($expr_ident: ident [$($ident_tt: tt)*]) => { ... };
    ($expr_ident: ident $( $ident: ident $($pat: pat)|+ => $expr: expr,)+ ) => { ... };
}