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#[macro_use]
mod macros;
use proc_macro2::{Delimiter, Group, TokenStream, TokenTree};
use quote::quote;
use std::iter::FromIterator;
use syn::{Item, Pat, Stmt};
#[test]
fn test_pat_ident() {
match syn::parse2(quote!(self)).unwrap() {
Pat::Ident(_) => (),
value => panic!("expected PatIdent, got {:?}", value),
}
}
#[test]
fn test_pat_path() {
match syn::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::<Item>("fn f() {}").unwrap();
syn::parse_str::<Item>("fn fun1(| A: E) {}").unwrap_err();
syn::parse_str::<Item>("fn fun2(|| A: E) {}").unwrap_err();
syn::parse_str::<Stmt>("let | () = ();").unwrap();
syn::parse_str::<Stmt>("let (| A): E;").unwrap();
syn::parse_str::<Stmt>("let (|| A): (E);").unwrap_err();
syn::parse_str::<Stmt>("let (| A,): (E,);").unwrap();
syn::parse_str::<Stmt>("let [| A]: [E; 1];").unwrap();
syn::parse_str::<Stmt>("let [|| A]: [E; 1];").unwrap_err();
syn::parse_str::<Stmt>("let TS(| A): TS;").unwrap();
syn::parse_str::<Stmt>("let TS(|| A): TS;").unwrap_err();
syn::parse_str::<Stmt>("let NS { f: | A }: NS;").unwrap();
syn::parse_str::<Stmt>("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)]);
snapshot!(tokens as Pat, @r###"
Pat::TupleStruct {
path: Path {
segments: [
PathSegment {
ident: "Some",
arguments: None,
},
],
},
pat: PatTuple {
elems: [
Pat::Wild,
],
},
}
"###);
}
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