{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"debug!(\"project_array_fields:"}]}
        debug!("project_array_fields: {base:?} {len}");
        // Ensure that all the offsets are in-bounds once, up-front.
        base.offset(len * stride, self.layout_of(self.tcx.types.unit).unwrap(), self)?;