fn iterate_pairs<'x>(&'x self)
        -> Result<Box<Iterator<Item=(Var<'x, 'render>, Var<'x, 'render>)>+'x>,
                  DataError>
        where 'render: 'x
    {
        Err(DataError::PairIterationUnsupported(self.typename()))
    }
/// Return iterator over pairs if appropriate
Return iterator over pairs if appropriate
Return iterator over pairs if appropriate
fn iterate_pairs<'x>(&'x self)
        -> Result<Box<Iterator<Item=(Var<'x, 'render>, Var<'x, 'render>)>+'x>,
                  DataError>
        where 'render: 'x
    {
        Err(DataError::PairIterationUnsupported(self.typename()))
    }
fn iterate_pairs < ' x > ( & ' x self ) -> Result < Box < Iterator < Item = ( Var < ' x , ' render > , Var < ' x , ' render > ) > + ' x > , DataError > where ' render : ' x { Err ( DataError :: PairIterationUnsupported ( self . typename ( ) ) ) }
Return iterator over pairs if appropriate
Return iterator over pairs if appropriate
&'x self
&'x self