syntax_data: {"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let uneval = ty::UnevaluatedConst::new(def_id, args);
context_before:         &ExprKind::NamedConst { def_id, args, user_ty: _ } => {
context_after:             ty::Const::new_unevaluated(tcx, uneval)