From d83b95cbf4895027b1730ef6025df4fe01beba26 Mon Sep 17 00:00:00 2001
From: Anton Serov <codeviolin@gmail.com>
Date: Thu, 10 Jul 2025 22:57:09 +0300
Subject: [PATCH] fixed .fixed flush recursion

---
 lib/std/Io/Writer.zig | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/std/Io/Writer.zig b/lib/std/Io/Writer.zig
index d79959dcb1..2b0333d4d4 100644
--- a/lib/std/Io/Writer.zig
+++ b/lib/std/Io/Writer.zig
@@ -114,7 +114,10 @@ pub const FileError = error{
 /// Writes to `buffer` and returns `error.WriteFailed` when it is full.
 pub fn fixed(buffer: []u8) Writer {
     return .{
-        .vtable = &.{ .drain = fixedDrain },
+        .vtable = &.{
+            .drain = fixedDrain,
+            .flush = noopFlush,
+        },
         .buffer = buffer,
     };
 }
@@ -244,6 +247,15 @@ pub fn noopFlush(w: *Writer) Error!void {
     _ = w;
 }
 
+test "fixed buffer flush" {
+    var buffer: [1]u8 = undefined;
+    var writer: std.io.Writer = .fixed(&buffer);
+
+    try writer.writeByte(10);
+    try writer.flush();
+    try testing.expectEqual(10, buffer[0]);
+}
+
 /// Calls `VTable.drain` but hides the last `preserve_length` bytes from the
 /// implementation, keeping them buffered.
 pub fn drainPreserve(w: *Writer, preserve_length: usize) Error!void {