syntax_data: {"ast_node_type":"variable","tokens":[{"end":22,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mu_array =
context_before:         let mu_array_ty = Ty::new_array(tcx, mu, array_len);
context_after:             local_decls.push(LocalDecl::with_source_info(mu_array_ty, source_info)).into();