syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if self.is_impl_trait_in_trait(def_id) {
context_before:             ty::AliasTermKind::ProjectionTy => {
context_after:                     Some(self.variances_of(def_id))