{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"///"}]}
/// can be used with [`TyCtxt::type_of()`] to get the type of the field.
/// where `x` here represents the `DefId` of `S.x`. Then, the `DefId`
#[derive(TyEncodable, TyDecodable)]