syntax_data: {"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let array_len = op_size.bytes();
context_before:         let mu = Ty::new_maybe_uninit(tcx, tcx.types.u8);
context_after:         let mu_array_ty = Ty::new_array(tcx, mu, array_len);