const fn do_env_dir_close<'a, 'b, Pos: StringPosition, T: FromLaTeXToken<'a, Pos>, State: ParserState<'a, Pos, T>>(
e: Environment<'a, Pos, T>,
_: &'b mut LaTeXParser<'a, Pos, T, State>,
) -> EnvironmentResult<'a, Pos, T>const fn do_env_dir_close<'a, 'b, Pos: StringPosition, T: FromLaTeXToken<'a, Pos>, State: ParserState<'a, Pos, T>>(
e: Environment<'a, Pos, T>,
_: &'b mut LaTeXParser<'a, Pos, T, State>,
) -> EnvironmentResult<'a, Pos, T>