remove `DEBUG_OUT()` macro

This macro is no longer used ([GH-5933]).

1 files changed, 0 insertions, 6 deletions

diff --git a/thread_win32.c b/thread_win32.c
index ec5d336589..a8c9b94cd7 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -25,12 +25,6 @@
 #define ubf_timer_disarm() do {} while (0)
 #define ubf_list_atfork() do {} while (0)
 
-#define DEBUG_OUT() \
-  WaitForSingleObject(&debug_mutex, INFINITE); \
-  printf(POSITION_FORMAT"%#lx - %s" POSITION_ARGS, GetCurrentThreadId(), buf); \
-  fflush(stdout); \
-  ReleaseMutex(&debug_mutex);
-
 static volatile DWORD ruby_native_thread_key = TLS_OUT_OF_INDEXES;
 
 static int w32_wait_events(HANDLE *events, int count, DWORD timeout, rb_thread_t *th);