syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"ty::Infer(ty::TyVar(_))"}]}
source_snippet:                 ty::Infer(ty::TyVar(_)) => {
context_before:                 ty::Alias(kind @ (ty::Projection | ty::Opaque), alias_ty) => (kind, alias_ty),
context_after:                     on_ambiguity();