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