https://git.ruby-lang.org/ruby.git/commit/?id=a1246270c5

From a1246270c55051413ef5830684baff94e1139814 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Sun, 2 Aug 2020 04:51:15 +0900
Subject: remove accidentally introduced debug code


diff --git a/debug.c b/debug.c
index 1dd7eeb..205e985 100644
--- a/debug.c
+++ b/debug.c
@@ -292,8 +292,8 @@ setup_debug_log(void) https://github.com/ruby/ruby/blob/trunk/debug.c#L292
     const char *log_config = getenv("RUBY_DEBUG_LOG");
     if (log_config) {
         fprintf(stderr, "RUBY_DEBUG_LOG=%s\n", log_config);
-        unsetenv("RUBY_DEBUG_LOG");
-        if  (strcmp(log_config, "mem")    == 0) {
+
+        if  (strcmp(log_config, "mem") == 0) {
             debug_log.mem = (char *)malloc(MAX_DEBUG_LOG * MAX_DEBUG_LOG_MESSAGE_LEN);
             if (debug_log.mem == NULL) {
                 fprintf(stderr, "setup_debug_log failed (can't allocate memory)\n");
-- 
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