From 5e9cb65aa592aebe4b4d89f0b8ca7b468224aa5c Mon Sep 17 00:00:00 2001
From: Manlio Perillo <manlio.perillo@gmail.com>
Date: Tue, 27 Feb 2024 09:36:09 +0100
Subject: [PATCH] os: improve the unexpectedErrno function

Print the error name, instead of the error number, when possible.
Error numbers are platform specific.
---
 lib/std/os.zig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/std/os.zig b/lib/std/os.zig
index 00496602fdce..d0e3bb7ebfd0 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -6048,7 +6048,11 @@ pub const UnexpectedError = error{
 /// and you get an unexpected error.
 pub fn unexpectedErrno(err: E) UnexpectedError {
     if (unexpected_error_tracing) {
-        std.debug.print("unexpected errno: {d}\n", .{@intFromEnum(err)});
+        if (std.enums.tagName(E, err)) |name| {
+            std.debug.print("unexpected error: E.{s}\n", .{name});
+        } else {
+            std.debug.print("unexpected errno: {d}\n", .{@intFromEnum(err)});
+        }
         std.debug.dumpCurrentStackTrace(null);
     }
     return error.Unexpected;