Macro gen_builder_state

macro_rules! gen_builder_state {
    {
		$(
			$(#[$state_meta:meta])*
			state
		)?

		$(
			$(#[$container_meta:meta])*
			container
		)?

		$(
			$(#[$uninit_meta:meta])*
			uninit
		)?

		$(
			field $field:ident;
			init $field_init:ident;
		)*
	} => { ... };
    {
		@impl gen_uninit
		$(
			$(#[$uninit_meta:meta])*
			uninit
		)?

		{ $($uninit_type:ident)* }
		{
			$field:ident
			$($field_rest:ident)*
		}
	} => { ... };
    {
		@impl gen_uninit
		$(
			$(#[$uninit_meta:meta])*
			uninit
		)?

		{ $($uninit_type:ident)* }
		{}
	} => { ... };
    {
		@impl state_init_types
		{}
		{}
		{}
	} => { ... };
    {
		@impl state_init_types
		{}
		{}
		{
			$field_next:ident $field_init_next:ident
			$($field_rest:ident $field_init_rest:ident)*
		}
	} => { ... };
    {
		@impl state_init_types
		{ $($field_prev:ident $field_init_prev:ident)* }
		{ $field:ident $field_init:ident }
		{
			$field_next:ident $field_init_next:ident
			$($field_rest:ident $field_init_rest:ident)*
		}
	} => { ... };
    {
		@impl state_init_types
		{ $($field_prev:ident $field_init_prev:ident)* }
		{ $field:ident $field_init:ident }
		{}
	} => { ... };
}