4 #![crate_type = "proc-macro"]
6 extern crate proc_macro;
10 #[proc_macro_attribute]
11 pub fn assert1(_a: TokenStream, b: TokenStream) -> TokenStream {
12 assert_eq(b.clone(), "pub fn foo() {}".parse().unwrap());
16 #[proc_macro_derive(Foo, attributes(foo))]
17 pub fn assert2(a: TokenStream) -> TokenStream {
18 assert_eq(a, "pub struct MyStructc { _a: i32, }".parse().unwrap());
22 fn assert_eq(a: TokenStream, b: TokenStream) {
23 let mut a = a.into_iter();
24 let mut b = b.into_iter();
25 for (a, b) in a.by_ref().zip(&mut b) {
27 (TokenTree::Group(a), TokenTree::Group(b)) => {
28 assert_eq!(a.delimiter(), b.delimiter());
29 assert_eq(a.stream(), b.stream());
31 (TokenTree::Punct(a), TokenTree::Punct(b)) => {
32 assert_eq!(a.as_char(), b.as_char());
33 assert_eq!(a.spacing(), b.spacing());
35 (TokenTree::Literal(a), TokenTree::Literal(b)) => {
36 assert_eq!(a.to_string(), b.to_string());
38 (TokenTree::Ident(a), TokenTree::Ident(b)) => {
39 assert_eq!(a.to_string(), b.to_string());
41 (a, b) => panic!("{:?} != {:?}", a, b),
45 assert!(a.next().is_none());
46 assert!(b.next().is_none());