From 04512a3e13c05e5afbc59b89f35ac8422ddd71fc Mon Sep 17 00:00:00 2001
From: Tau <jonathan.haehne@hotmail.com>
Date: Sat, 13 Jul 2024 22:51:38 +0200
Subject: [PATCH] Fix #14238

While we can't cover every I/O function like this, lockStdErr covers
std.debug.print and std.log.*, probably the most important places to
leave a useful hint for newcomers to Zig.
---
 lib/std/Progress.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/std/Progress.zig b/lib/std/Progress.zig
index 190f66789756..a10fc1c6aa41 100644
--- a/lib/std/Progress.zig
+++ b/lib/std/Progress.zig
@@ -543,6 +543,8 @@ fn windowsApiUpdateThreadRun() void {
 ///
 /// The lock is recursive; the same thread may hold the lock multiple times.
 pub fn lockStdErr() void {
+    if (@inComptime())
+        @compileError("I/O cannot be used from comptime. Consider using @compileError() or @compileLog().");
     stderr_mutex.lock();
     clearWrittenWithEscapeCodes() catch {};
 }