{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"ConstKind::Expr(_)"}]}
                    ConstKind::Expr(_) => {
                    ConstKind::Value(cv) => Ok(tcx.valtree_to_const_val(cv)),
                        bug!("Normalization of `ty::ConstKind::Expr` is unimplemented")