--- Libc/Libc-1725.40.4/tests/flushlbuf.c
+++ /dev/null
@@ -1,155 +0,0 @@
-/*-
- * Copyright (c) 2023 Klara, Inc.
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#include <errno.h>
-#include <stdio.h>
-
-#include <darwintest.h>
-
-T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
-
-#define BUFSIZE 16
-
-static const char seq[] =
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-    "abcdefghijklmnopqrstuvwxyz"
-    "0123456789+/";
-
-struct stream {
-	char buf[BUFSIZE];
-	unsigned int len;
-	unsigned int pos;
-};
-
-static int writefn(void *cookie, const char *buf, int len)
-{
-	struct stream *s = cookie;
-	int written = 0;
-
-	if (len <= 0)
-		return 0;
-	while (len > 0 && s->pos < s->len) {
-		s->buf[s->pos++] = *buf++;
-		written++;
-		len--;
-	}
-	if (written > 0)
-		return written;
-	errno = EAGAIN;
-	return -1;
-}
-
-T_DECL(flushlbuf_partial,
-    "Flush a line-buffered stream with partial write failure")
-{
-	static struct stream s;
-	static char buf[BUFSIZE + 1];
-	FILE *f;
-	unsigned int i = 0;
-	int ret = 0;
-
-	/*
-	 * Create the stream and its buffer, print just enough characters
-	 * to the stream to fill the buffer without triggering a flush,
-	 * then check the state.
-	 */
-	T_SETUPBEGIN;
-	s.len = BUFSIZE / 2; // write will fail after this amount
-	T_ASSERT_NOTNULL(f = fwopen(&s, writefn), NULL);
-	T_ASSERT_POSIX_SUCCESS(setvbuf(f, buf, _IOLBF, BUFSIZE), NULL);
-	while (i < BUFSIZE)
-		if ((ret = fprintf(f, "%c", seq[i++])) < 0)
-			break;
-	T_EXPECT_EQ(i, BUFSIZE, NULL);
-	T_EXPECT_EQ(buf[BUFSIZE - 1], seq[i - 1], NULL);
-	T_EXPECT_POSIX_SUCCESS(ret, NULL);
-	T_EXPECT_EQ(s.pos, 0, NULL);
-
-	/*
-	 * At this point, the buffer is full but writefn() has not yet
-	 * been called.  The next fprintf() call will trigger a preemptive
-	 * fflush(), and writefn() will consume s.len characters before
-	 * returning EAGAIN, causing fprintf() to fail without having
-	 * written anything (which is why we don't increment i here).
-	 */
-	ret = fprintf(f, "%c", seq[i]);
-	T_EXPECT_POSIX_FAILURE(ret, EAGAIN, NULL);
-	T_EXPECT_EQ(s.pos, s.len, NULL);
-
-	/*
-	 * We have consumed s.len characters from the buffer, so continue
-	 * printing until it is full again and check that no overflow has
-	 * occurred yet.
-	 */
-	while (i < BUFSIZE + s.len)
-		fprintf(f, "%c", seq[i++]);
-	T_EXPECT_EQ(i, BUFSIZE + s.len, NULL);
-	T_EXPECT_EQ(buf[BUFSIZE - 1], seq[i - 1], NULL);
-	T_EXPECT_EQ(buf[BUFSIZE], 0, NULL);
-	T_SETUPEND;
-
-	/*
-	 * The straw that breaks the camel's back: libc fails to recognize
-	 * that the buffer is full and continues to write beyond its end.
-	 */
-	fprintf(f, "%c", seq[i++]);
-	T_EXPECT_EQ(buf[BUFSIZE], 0, "Checking for overflow");
-}
-
-T_DECL(flushlbuf_full,
-    "Flush a line-buffered stream with full write failure")
-{
-	static struct stream s;
-	static char buf[BUFSIZE];
-	FILE *f;
-	unsigned int i = 0;
-	int ret = 0;
-
-	/*
-	 * Create the stream and its buffer, print just enough characters
-	 * to the stream to fill the buffer without triggering a flush,
-	 * then check the state.
-	 */
-	T_SETUPBEGIN;
-	s.len = 0; // any attempt to write will fail
-	T_ASSERT_NOTNULL(f = fwopen(&s, writefn), NULL);
-	T_ASSERT_POSIX_SUCCESS(setvbuf(f, buf, _IOLBF, BUFSIZE), NULL);
-	while (i < BUFSIZE)
-		if ((ret = fprintf(f, "%c", seq[i++])) < 0)
-			break;
-	T_EXPECT_EQ(i, BUFSIZE, NULL);
-	T_EXPECT_EQ(buf[BUFSIZE - 1], seq[i - 1], NULL);
-	T_EXPECT_POSIX_SUCCESS(ret, NULL);
-	T_EXPECT_EQ(s.pos, 0, NULL);
-
-	/*
-	 * At this point, the buffer is full but writefn() has not yet
-	 * been called.  The next fprintf() call will trigger a preemptive
-	 * fflush(), and writefn() will immediately return EAGAIN, causing
-	 * fprintf() to fail without having written anything (which is why
-	 * we don't increment i here).
-	 */
-	ret = fprintf(f, "%c", seq[i]);
-	T_EXPECT_POSIX_FAILURE(ret, EAGAIN, NULL);
-	T_EXPECT_EQ(s.pos, s.len, NULL);
-
-	/*
-	 * Now make our stream writeable.
-	 */
-	s.len = sizeof(s.buf);
-	T_SETUPEND;
-
-	/*
-	 * Flush the stream again.  The data we failed to write previously
-	 * should still be in the buffer and will now be written to the
-	 * stream.
-	 *
-	 * This was broken in 02862c291: a failure on the first attempt to
-	 * write will discard the unwritten data.
-	 */
-	T_EXPECT_POSIX_SUCCESS(fflush(f), NULL);
-	T_EXPECT_EQ(s.buf[0], seq[0], NULL);
-}