syntax_data: {"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let hir_id = self.tcx.local_def_id_to_hir_id(def_id.expect_local());
context_before:             Res::Def(DefKind::ConstParam, def_id) => {
context_after:                 let generics = self.tcx.generics_of(hir_id.owner);