syntax_data: {"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let param_env = tcx.param_env(def_id);
context_before:     with_replaced_escaping_bound_vars(&infcx, &mut vec![None], bound_tys, |bound_tys| {
context_after:         let ocx = ObligationCtxt::new(&infcx);