Macro debug_helper::impl_debug_for_enum

macro_rules! impl_debug_for_enum {
    ($enum_name:ident::{$( $($variant_unit:ident)? $(($variant_tuple:ident ($($tuple:tt)*) $(:($(.$t_first_field:tt)? $((.$t_first_field_2:tt, $($t_first_field_2_fmt:tt)+))? $(, $(.$t_field:tt)? $((.$t_field_2:tt, $($t_field_2_fmt:tt)+))?)* $(,)*))? ) )? $({$variant_struct:ident {$($struct:tt)*} $(:($(.$s_first_field:tt)? $((.$s_first_field_2:tt, $($s_first_field_2_fmt:tt)+))? $(, $(.$s_field:tt)? $((.$s_field_2:tt, $($s_field_2_fmt:tt)+))?)* $(,)*))? })? ),+ $(,)*}, $formatter:expr, $self:expr $(,)*) => { ... };
}