pub type EnvOpenRule<'a, Pos: StringPosition, T: FromLaTeXToken<'a, Pos>, State: ParserState<'a, Pos, T>> = for<'b, 'c> fn(&'b mut Environment<'a, Pos, T>, &'c mut LaTeXParser<'a, Pos, T, State>);pub type EnvOpenRule<'a, Pos: StringPosition, T: FromLaTeXToken<'a, Pos>, State: ParserState<'a, Pos, T>> = for<'b, 'c> fn(&'b mut Environment<'a, Pos, T>, &'c mut LaTeXParser<'a, Pos, T, State>);