#![allow(clippy::uninlined_format_args)] #[macro_use] mod macros; use proc_macro2::{Delimiter, Group, TokenStream, TokenTree}; use quote::quote; use syn::parse::Parser; use syn::{Item, Pat, Stmt}; #[test] fn test_pat_ident() { match Pat::parse_single.parse2(quote!(self)).unwrap() { Pat::Ident(_) => (), value => panic!("expected PatIdent, got {:?}", value), } } #[test] fn test_pat_path() { match Pat::parse_single.parse2(quote!(self::CONST)).unwrap() { Pat::Path(_) => (), value => panic!("expected PatPath, got {:?}", value), } } #[test] fn test_leading_vert() { // https://github.com/rust-lang/rust/blob/1.43.0/src/test/ui/or-patterns/remove-leading-vert.rs syn::parse_str::("fn f() {}").unwrap(); syn::parse_str::("fn fun1(| A: E) {}").unwrap_err(); syn::parse_str::("fn fun2(|| A: E) {}").unwrap_err(); syn::parse_str::("let | () = ();").unwrap_err(); syn::parse_str::("let (| A): E;").unwrap(); syn::parse_str::("let (|| A): (E);").unwrap_err(); syn::parse_str::("let (| A,): (E,);").unwrap(); syn::parse_str::("let [| A]: [E; 1];").unwrap(); syn::parse_str::("let [|| A]: [E; 1];").unwrap_err(); syn::parse_str::("let TS(| A): TS;").unwrap(); syn::parse_str::("let TS(|| A): TS;").unwrap_err(); syn::parse_str::("let NS { f: | A }: NS;").unwrap(); syn::parse_str::("let NS { f: || A }: NS;").unwrap_err(); } #[test] fn test_group() { let group = Group::new(Delimiter::None, quote!(Some(_))); let tokens = TokenStream::from_iter(vec![TokenTree::Group(group)]); let pat = Pat::parse_single.parse2(tokens).unwrap(); snapshot!(pat, @r###" Pat::TupleStruct { path: Path { segments: [ PathSegment { ident: "Some", }, ], }, elems: [ Pat::Wild, ], } "###); } #[test] fn test_ranges() { Pat::parse_single.parse_str("..").unwrap(); Pat::parse_single.parse_str("..hi").unwrap(); Pat::parse_single.parse_str("lo..").unwrap(); Pat::parse_single.parse_str("lo..hi").unwrap(); Pat::parse_single.parse_str("..=").unwrap_err(); Pat::parse_single.parse_str("..=hi").unwrap(); Pat::parse_single.parse_str("lo..=").unwrap_err(); Pat::parse_single.parse_str("lo..=hi").unwrap(); Pat::parse_single.parse_str("...").unwrap_err(); Pat::parse_single.parse_str("...hi").unwrap_err(); Pat::parse_single.parse_str("lo...").unwrap_err(); Pat::parse_single.parse_str("lo...hi").unwrap(); Pat::parse_single.parse_str("[lo..]").unwrap_err(); Pat::parse_single.parse_str("[..=hi]").unwrap_err(); Pat::parse_single.parse_str("[(lo..)]").unwrap(); Pat::parse_single.parse_str("[(..=hi)]").unwrap(); Pat::parse_single.parse_str("[lo..=hi]").unwrap(); Pat::parse_single.parse_str("[_, lo.., _]").unwrap_err(); Pat::parse_single.parse_str("[_, ..=hi, _]").unwrap_err(); Pat::parse_single.parse_str("[_, (lo..), _]").unwrap(); Pat::parse_single.parse_str("[_, (..=hi), _]").unwrap(); Pat::parse_single.parse_str("[_, lo..=hi, _]").unwrap(); }