{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"self.vec.extend(self.param_kinds[self.vec.len()..].iter().map(filler));"}]}
        self.vec.extend(self.param_kinds[self.vec.len()..].iter().map(filler));
    pub fn fill(mut self, filler: impl FnMut(&ParamKind) -> GenericArg) -> Self {
        assert_eq!(self.remaining(), 0);