syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"ty::Alias(kind"}]}
source_snippet:                 ty::Alias(kind @ (ty::Projection | ty::Opaque), alias_ty) => (kind, alias_ty),
context_before:             let (kind, alias_ty) = match *self_ty.kind() {
context_after:                 ty::Infer(ty::TyVar(_)) => {