Function include_current_position

pub fn include_current_position(reader: &hREADER, err: IonCError) -> IonCError

Asks reader for its current position and includes it in err.

If the position is already known, then this method does nothing. If reading the position returns an error, then this method also does nothing!

This method is defined on the reader handle directly because of partial borrow requirements in the implementation of the Reader trait.