syntax_data: {"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let def_id = interner.parent(self.def_id);
context_before:     pub fn trait_ref(&self, interner: I) -> ExistentialTraitRef<I> {
context_after:         let args_count = interner.generics_of(def_id).count() - 1;