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-rw-r--r--third_party/rust/syn/tests/test_grouping.rs52
1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/rust/syn/tests/test_grouping.rs b/third_party/rust/syn/tests/test_grouping.rs
new file mode 100644
index 0000000000..9eb7eee9b7
--- /dev/null
+++ b/third_party/rust/syn/tests/test_grouping.rs
@@ -0,0 +1,52 @@
+#[macro_use]
+mod macros;
+
+use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, TokenStream, TokenTree};
+use std::iter::FromIterator;
+use syn::Expr;
+
+#[test]
+fn test_grouping() {
+ let tokens: TokenStream = TokenStream::from_iter(vec![
+ TokenTree::Literal(Literal::i32_suffixed(1)),
+ TokenTree::Punct(Punct::new('+', Spacing::Alone)),
+ TokenTree::Group(Group::new(
+ Delimiter::None,
+ TokenStream::from_iter(vec![
+ TokenTree::Literal(Literal::i32_suffixed(2)),
+ TokenTree::Punct(Punct::new('+', Spacing::Alone)),
+ TokenTree::Literal(Literal::i32_suffixed(3)),
+ ]),
+ )),
+ TokenTree::Punct(Punct::new('*', Spacing::Alone)),
+ TokenTree::Literal(Literal::i32_suffixed(4)),
+ ]);
+
+ assert_eq!(tokens.to_string(), "1i32 + 2i32 + 3i32 * 4i32");
+
+ snapshot!(tokens as Expr, @r###"
+ Expr::Binary {
+ left: Expr::Lit {
+ lit: 1i32,
+ },
+ op: Add,
+ right: Expr::Binary {
+ left: Expr::Group {
+ expr: Expr::Binary {
+ left: Expr::Lit {
+ lit: 2i32,
+ },
+ op: Add,
+ right: Expr::Lit {
+ lit: 3i32,
+ },
+ },
+ },
+ op: Mul,
+ right: Expr::Lit {
+ lit: 4i32,
+ },
+ },
+ }
+ "###);
+}