{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"self[i].as_const().unwrap_or_else(||"}]}
        self[i].as_const().unwrap_or_else(|| bug!("expected const for param #{} in {:?}", i, self))
    pub fn const_at(&self, i: usize) -> ty::Const<'tcx> {
    }