{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"#[derive(Default,"}]}
#[derive(Default, Debug, TyEncodable, TyDecodable, HashStable)]
/// unerased regions.
pub struct ConcreteOpaqueTypes<'tcx>(pub FxIndexMap<LocalDefId, OpaqueHiddenType<'tcx>>);