vendor/syn/tests/test_pat.rs

   1 #![allow(clippy::uninlined_format_args)]
   2
   3 #[macro_use]
   4 mod macros;
   5
   6 use proc_macro2::{Delimiter, Group, TokenStream, TokenTree};
   7 use quote::quote;
   8 use syn::parse::Parser;
   9 use syn::{Item, Pat, Stmt};
  10
  11 #[test]
  12 fn test_pat_ident() {
  13     match Pat::parse_single.parse2(quote!(self)).unwrap() {
  14         Pat::Ident(_) => (),
  15         value => panic!("expected PatIdent, got {:?}", value),
  16     }
  17 }
  18
  19 #[test]
  20 fn test_pat_path() {
  21     match Pat::parse_single.parse2(quote!(self::CONST)).unwrap() {
  22         Pat::Path(_) => (),
  23         value => panic!("expected PatPath, got {:?}", value),
  24     }
  25 }
  26
  27 #[test]
  28 fn test_leading_vert() {
  29     // https://github.com/rust-lang/rust/blob/1.43.0/src/test/ui/or-patterns/remove-leading-vert.rs
  30
  31     syn::parse_str::<Item>("fn f() {}").unwrap();
  32     syn::parse_str::<Item>("fn fun1(| A: E) {}").unwrap_err();
  33     syn::parse_str::<Item>("fn fun2(|| A: E) {}").unwrap_err();
  34
  35     syn::parse_str::<Stmt>("let | () = ();").unwrap_err();
  36     syn::parse_str::<Stmt>("let (| A): E;").unwrap();
  37     syn::parse_str::<Stmt>("let (|| A): (E);").unwrap_err();
  38     syn::parse_str::<Stmt>("let (| A,): (E,);").unwrap();
  39     syn::parse_str::<Stmt>("let [| A]: [E; 1];").unwrap();
  40     syn::parse_str::<Stmt>("let [|| A]: [E; 1];").unwrap_err();
  41     syn::parse_str::<Stmt>("let TS(| A): TS;").unwrap();
  42     syn::parse_str::<Stmt>("let TS(|| A): TS;").unwrap_err();
  43     syn::parse_str::<Stmt>("let NS { f: | A }: NS;").unwrap();
  44     syn::parse_str::<Stmt>("let NS { f: || A }: NS;").unwrap_err();
  45 }
  46
  47 #[test]
  48 fn test_group() {
  49     let group = Group::new(Delimiter::None, quote!(Some(_)));
  50     let tokens = TokenStream::from_iter(vec![TokenTree::Group(group)]);
  51     let pat = Pat::parse_single.parse2(tokens).unwrap();
  52
  53     snapshot!(pat, @r###"
  54     Pat::TupleStruct {
  55         path: Path {
  56             segments: [
  57                 PathSegment {
  58                     ident: "Some",
  59                 },
  60             ],
  61         },
  62         elems: [
  63             Pat::Wild,
  64         ],
  65     }
  66     "###);
  67 }
  68
  69 #[test]
  70 fn test_ranges() {
  71     Pat::parse_single.parse_str("..").unwrap();
  72     Pat::parse_single.parse_str("..hi").unwrap();
  73     Pat::parse_single.parse_str("lo..").unwrap();
  74     Pat::parse_single.parse_str("lo..hi").unwrap();
  75
  76     Pat::parse_single.parse_str("..=").unwrap_err();
  77     Pat::parse_single.parse_str("..=hi").unwrap();
  78     Pat::parse_single.parse_str("lo..=").unwrap_err();
  79     Pat::parse_single.parse_str("lo..=hi").unwrap();
  80
  81     Pat::parse_single.parse_str("...").unwrap_err();
  82     Pat::parse_single.parse_str("...hi").unwrap_err();
  83     Pat::parse_single.parse_str("lo...").unwrap_err();
  84     Pat::parse_single.parse_str("lo...hi").unwrap();
  85
  86     Pat::parse_single.parse_str("[lo..]").unwrap_err();
  87     Pat::parse_single.parse_str("[..=hi]").unwrap_err();
  88     Pat::parse_single.parse_str("[(lo..)]").unwrap();
  89     Pat::parse_single.parse_str("[(..=hi)]").unwrap();
  90     Pat::parse_single.parse_str("[lo..=hi]").unwrap();
  91
  92     Pat::parse_single.parse_str("[_, lo.., _]").unwrap_err();
  93     Pat::parse_single.parse_str("[_, ..=hi, _]").unwrap_err();
  94     Pat::parse_single.parse_str("[_, (lo..), _]").unwrap();
  95     Pat::parse_single.parse_str("[_, (..=hi), _]").unwrap();
  96     Pat::parse_single.parse_str("[_, lo..=hi, _]").unwrap();
  97 }