| use proc_macro2::{Delimiter, Group, Ident, Span, TokenStream, TokenTree}; |
| use std::iter::{self, FromIterator}; |
| |
| #[test] |
| fn test_fmt_group() { |
| let ident = Ident::new("x", Span::call_site()); |
| let inner = TokenStream::from_iter(iter::once(TokenTree::Ident(ident))); |
| let parens_empty = Group::new(Delimiter::Parenthesis, TokenStream::new()); |
| let parens_nonempty = Group::new(Delimiter::Parenthesis, inner.clone()); |
| let brackets_empty = Group::new(Delimiter::Bracket, TokenStream::new()); |
| let brackets_nonempty = Group::new(Delimiter::Bracket, inner.clone()); |
| let braces_empty = Group::new(Delimiter::Brace, TokenStream::new()); |
| let braces_nonempty = Group::new(Delimiter::Brace, inner.clone()); |
| let none_empty = Group::new(Delimiter::None, TokenStream::new()); |
| let none_nonempty = Group::new(Delimiter::None, inner.clone()); |
| |
| // Matches libproc_macro. |
| assert_eq!("()", parens_empty.to_string()); |
| assert_eq!("(x)", parens_nonempty.to_string()); |
| assert_eq!("[]", brackets_empty.to_string()); |
| assert_eq!("[x]", brackets_nonempty.to_string()); |
| assert_eq!("{ }", braces_empty.to_string()); |
| assert_eq!("{ x }", braces_nonempty.to_string()); |
| assert_eq!("", none_empty.to_string()); |
| assert_eq!("x", none_nonempty.to_string()); |
| } |
