From a87fd37bf59a975ba057bec408d2908d6168a084 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 27 Oct 2025 13:51:14 -0700
Subject: [PATCH] std.Io: make Evented equal void when unimplemented

This allows conditional compilation checks.
---
 lib/std/Io.zig | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/std/Io.zig b/lib/std/Io.zig
index 1649341afc..0f69f8ed9c 100644
--- a/lib/std/Io.zig
+++ b/lib/std/Io.zig
@@ -560,8 +560,14 @@ test {
 const Io = @This();
 
 pub const Evented = switch (builtin.os.tag) {
-    .linux => @import("Io/IoUring.zig"),
-    .dragonfly, .freebsd, .netbsd, .openbsd, .macos, .ios, .tvos, .visionos, .watchos => @import("Io/Kqueue.zig"),
+    .linux => switch (builtin.cpu.arch) {
+        .x86_64, .aarch64 => @import("Io/IoUring.zig"),
+        else => void, // context-switching code not implemented yet
+    },
+    .dragonfly, .freebsd, .netbsd, .openbsd, .macos, .ios, .tvos, .visionos, .watchos => switch (builtin.cpu.arch) {
+        .x86_64, .aarch64 => @import("Io/Kqueue.zig"),
+        else => void, // context-switching code not implemented yet
+    },
     else => void,
 };
 pub const Threaded = @import("Io/Threaded.zig");