{"ast_node_type":"struct","tokens":[{"end":39,"kind":"keyword","start":0,"text":"///"}]}
/// must be added to the struct header.
/// Tracks the `T: 'a` or `'a: 'a` predicates that we have inferred
pub(crate) type RequiredPredicates<'tcx> = FxIndexMap<ty::ArgOutlivesPredicate<'tcx>, Span>;