From b0691df5ba898c8f6ac2c03e19e312502a2a0cc5 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Thu, 25 Dec 2025 15:36:21 -0800
Subject: [PATCH] test_runner: fix simple runner compilation

---
 lib/compiler/test_runner.zig | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/lib/compiler/test_runner.zig b/lib/compiler/test_runner.zig
index 32b589cec8415f9bd2ad0985a6b8dcc4272c00b7..da3da684d920bd9758406453a19eda086782b676 100644
--- a/lib/compiler/test_runner.zig
+++ b/lib/compiler/test_runner.zig
@@ -329,6 +329,8 @@ pub fn mainSimple() anyerror!void {
         else => false,
     };
 
+    testing.io_instance = .init(testing.allocator, .{});
+
     var passed: u64 = 0;
     var skipped: u64 = 0;
     var failed: u64 = 0;
@@ -338,26 +340,26 @@ pub fn mainSimple() anyerror!void {
 
     for (builtin.test_functions) |test_fn| {
         if (enable_write) {
-            stdout.writeAll(test_fn.name) catch {};
-            stdout.writeAll("... ") catch {};
+            stdout.writeStreamingAll(runner_threaded_io, test_fn.name) catch {};
+            stdout.writeStreamingAll(runner_threaded_io, "... ") catch {};
         }
         if (test_fn.func()) |_| {
-            if (enable_write) stdout.writeAll("PASS\n") catch {};
+            if (enable_write) stdout.writeStreamingAll(runner_threaded_io, "PASS\n") catch {};
         } else |err| {
             if (err != error.SkipZigTest) {
-                if (enable_write) stdout.writeAll("FAIL\n") catch {};
+                if (enable_write) stdout.writeStreamingAll(runner_threaded_io, "FAIL\n") catch {};
                 failed += 1;
                 if (!enable_write) return err;
                 continue;
             }
-            if (enable_write) stdout.writeAll("SKIP\n") catch {};
+            if (enable_write) stdout.writeStreamingAll(runner_threaded_io, "SKIP\n") catch {};
             skipped += 1;
             continue;
         }
         passed += 1;
     }
     if (enable_print) {
-        var stdout_writer = stdout.writer(&.{});
+        var stdout_writer = stdout.writer(runner_threaded_io, &.{});
         stdout_writer.interface.print("{} passed, {} skipped, {} failed\n", .{ passed, skipped, failed }) catch {};
     }
     if (failed != 0) std.process.exit(1);
-- 
2.54.0