From f4273659a28f2d1f82cc30bbcad69d833383c23d Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 24 Jul 2022 21:34:03 -0700
Subject: [PATCH] Add test of ineffective TokenStream size_hint

---
 tests/test.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/test.rs b/tests/test.rs
index 86031db6..99874e9a 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -547,6 +547,13 @@ fn default_tokenstream_is_empty() {
     assert!(default_token_stream.is_empty());
 }
 
+#[test]
+fn tokenstream_size_hint() {
+    let tokens = "a b (c d) e".parse::<TokenStream>().unwrap();
+
+    assert_eq!(tokens.into_iter().size_hint(), (0, None)); // FIXME
+}
+
 #[test]
 fn tuple_indexing() {
     // This behavior may change depending on https://github.com/rust-lang/rust/pull/71322