syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let (kind, alias_ty) = match *self_ty.kind() {
context_before:         loop {
context_after:                 ty::Alias(kind @ (ty::Projection | ty::Opaque), alias_ty) => (kind, alias_ty),