From d0c8b29ec66e1ddf9a4f722969794f8ebc6f07e7 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Sat, 29 Jan 2022 12:18:27 -0500
Subject: [PATCH] fs: Add a regression test for #93384

---
 library/std/src/fs/tests.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/library/std/src/fs/tests.rs b/library/std/src/fs/tests.rs
index a62c01ef29b27..16b8bf68242ef 100644
--- a/library/std/src/fs/tests.rs
+++ b/library/std/src/fs/tests.rs
@@ -1504,3 +1504,19 @@ fn create_dir_long_paths() {
     let path = Path::new("");
     assert_eq!(path.canonicalize().unwrap_err().kind(), crate::io::ErrorKind::NotFound);
 }
+
+/// Ensure ReadDir works on large directories.
+/// Regression test for https://github.com/rust-lang/rust/issues/93384.
+#[test]
+fn read_large_dir() {
+    let tmpdir = tmpdir();
+
+    let count = 32 * 1024;
+    for i in 0..count {
+        check!(fs::File::create(tmpdir.join(&i.to_string())));
+    }
+
+    for entry in fs::read_dir(tmpdir.path()).unwrap() {
+        entry.unwrap();
+    }
+}