Function shift_relative_wrapping 

pub fn shift_relative_wrapping(e: Expr, dr: i64, dc: i64) -> Expr

Defined names: relative parts move by (dr, dc), wrapping around the sheet’s edges. Files store a name’s relative references as seen from A1 (a name for “the cell to the left” defined in B1 is Sheet1!XFD1), and a use in another cell moves them by that cell’s offset from A1.