syntax_data: {"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let generics = self.tcx.generics_of(hir_id.owner);
context_before:                 let hir_id = self.tcx.local_def_id_to_hir_id(def_id.expect_local());
context_after:                 let Some(&index) = generics.param_def_id_to_index.get(&def_id) else {