14     fn append<U>(&mut self, token: U)  in append()
16         U: Into<TokenTree>;  in append()
44     fn append_separated<I, U>(&mut self, iter: I, op: U)  in append_separated()
48         U: ToTokens;  in append_separated()
54     fn append_terminated<I, U>(&mut self, iter: I, term: U)  in append_terminated()
58         U: ToTokens;  in append_terminated()
62     fn append<U>(&mut self, token: U)  in append()
64         U: Into<TokenTree>,  in append()
79     fn append_separated<I, U>(&mut self, iter: I, op: U)  in append_separated()
83         U: ToTokens,  in append_separated()
93     fn append_terminated<I, U>(&mut self, iter: I, term: U)  in append_terminated()
97         U: ToTokens,  in append_terminated()