1 | #[macro_use ] |
2 | mod macros; |
3 | |
4 | use proc_macro2::{Delimiter, Group, TokenStream, TokenTree}; |
5 | use quote::quote; |
6 | use std::iter::FromIterator; |
7 | use syn::{Item, Pat, Stmt}; |
8 | |
9 | #[test] |
10 | fn test_pat_ident() { |
11 | match syn::parse2(quote!(self)).unwrap() { |
12 | Pat::Ident(_) => (), |
13 | value => panic!("expected PatIdent, got {:?}" , value), |
14 | } |
15 | } |
16 | |
17 | #[test] |
18 | fn test_pat_path() { |
19 | match syn::parse2(quote!(self::CONST)).unwrap() { |
20 | Pat::Path(_) => (), |
21 | value => panic!("expected PatPath, got {:?}" , value), |
22 | } |
23 | } |
24 | |
25 | #[test] |
26 | fn test_leading_vert() { |
27 | // https://github.com/rust-lang/rust/blob/1.43.0/src/test/ui/or-patterns/remove-leading-vert.rs |
28 | |
29 | syn::parse_str::<Item>("fn f() {}" ).unwrap(); |
30 | syn::parse_str::<Item>("fn fun1(| A: E) {}" ).unwrap_err(); |
31 | syn::parse_str::<Item>("fn fun2(|| A: E) {}" ).unwrap_err(); |
32 | |
33 | syn::parse_str::<Stmt>("let | () = ();" ).unwrap(); |
34 | syn::parse_str::<Stmt>("let (| A): E;" ).unwrap(); |
35 | syn::parse_str::<Stmt>("let (|| A): (E);" ).unwrap_err(); |
36 | syn::parse_str::<Stmt>("let (| A,): (E,);" ).unwrap(); |
37 | syn::parse_str::<Stmt>("let [| A]: [E; 1];" ).unwrap(); |
38 | syn::parse_str::<Stmt>("let [|| A]: [E; 1];" ).unwrap_err(); |
39 | syn::parse_str::<Stmt>("let TS(| A): TS;" ).unwrap(); |
40 | syn::parse_str::<Stmt>("let TS(|| A): TS;" ).unwrap_err(); |
41 | syn::parse_str::<Stmt>("let NS { f: | A }: NS;" ).unwrap(); |
42 | syn::parse_str::<Stmt>("let NS { f: || A }: NS;" ).unwrap_err(); |
43 | } |
44 | |
45 | #[test] |
46 | fn test_group() { |
47 | let group = Group::new(Delimiter::None, quote!(Some(_))); |
48 | let tokens = TokenStream::from_iter(vec![TokenTree::Group(group)]); |
49 | |
50 | snapshot!(tokens as Pat, @r###" |
51 | Pat::TupleStruct { |
52 | path: Path { |
53 | segments: [ |
54 | PathSegment { |
55 | ident: "Some", |
56 | arguments: None, |
57 | }, |
58 | ], |
59 | }, |
60 | pat: PatTuple { |
61 | elems: [ |
62 | Pat::Wild, |
63 | ], |
64 | }, |
65 | } |
66 | "### ); |
67 | } |
68 | |