{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"return"}]}
                    return Ok(GenericArg::Const(AnonConst { id: ast::DUMMY_NODE_ID, value }));
                    let value = self.mk_expr_err(start.to(expr.span), guar);
                } else if snapshot.token == token::Colon