1 files changed, 7 insertions, 4 deletions
diff --git a/src/codegen/aarch64/Select.zig b/src/codegen/aarch64/Select.zig
index f390d83f03..138c70fecf 100644
--- a/src/codegen/aarch64/Select.zig
+++ b/src/codegen/aarch64/Select.zig
@@ -11273,15 +11273,18 @@ fn initValueAdvanced(
     return @enumFromInt(isel.values.items.len);
 }
 pub fn dumpValues(isel: *Select, which: enum { only_referenced, all }) void {
-    errdefer |err| @panic(@errorName(err));
-    const stderr, _ = std.debug.lockStderrWriter(&.{});
-    defer std.debug.unlockStderrWriter();
-
     const zcu = isel.pt.zcu;
+    const io = zcu.comp.io;
     const gpa = zcu.gpa;
     const ip = &zcu.intern_pool;
     const nav = ip.getNav(isel.nav_index);
 
+    errdefer |err| @panic(@errorName(err));
+
+    const stderr_writer = io.lockStderrWriter(&.{}) catch return;
+    defer io.unlockStderrWriter();
+    const stderr = &stderr_writer.interface;
+
     var reverse_live_values: std.AutoArrayHashMapUnmanaged(Value.Index, std.ArrayList(Air.Inst.Index)) = .empty;
     defer {
         for (reverse_live_values.values()) |*list| list.deinit(gpa);