{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"(Nested(current"}]}
            (Nested(current @ NestedSpan { span, nested_field_span }), Some(Nested(prev))) => {
            }
                self.tcx.dcx().emit_err(errors::FieldAlreadyDeclared::BothNested {