1 #![allow(clippy::from_iter_instead_of_collect)]
2
3 use proc_macro2::{Delimiter, Group, Ident, Span, TokenStream, TokenTree};
4 use std::iter::{self, FromIterator};
5
6 #[test]
test_fmt_group()7 fn test_fmt_group() {
8 let ident = Ident::new("x", Span::call_site());
9 let inner = TokenStream::from_iter(iter::once(TokenTree::Ident(ident)));
10 let parens_empty = Group::new(Delimiter::Parenthesis, TokenStream::new());
11 let parens_nonempty = Group::new(Delimiter::Parenthesis, inner.clone());
12 let brackets_empty = Group::new(Delimiter::Bracket, TokenStream::new());
13 let brackets_nonempty = Group::new(Delimiter::Bracket, inner.clone());
14 let braces_empty = Group::new(Delimiter::Brace, TokenStream::new());
15 let braces_nonempty = Group::new(Delimiter::Brace, inner.clone());
16 let none_empty = Group::new(Delimiter::None, TokenStream::new());
17 let none_nonempty = Group::new(Delimiter::None, inner);
18
19 // Matches libproc_macro.
20 assert_eq!("()", parens_empty.to_string());
21 assert_eq!("(x)", parens_nonempty.to_string());
22 assert_eq!("[]", brackets_empty.to_string());
23 assert_eq!("[x]", brackets_nonempty.to_string());
24 assert_eq!("{ }", braces_empty.to_string());
25 assert_eq!("{ x }", braces_nonempty.to_string());
26 assert_eq!("", none_empty.to_string());
27 assert_eq!("x", none_nonempty.to_string());
28 }
29