add test on github

min_broken/main.cpp

@@ -1,7 +1,12 @@
+#include <stdio.h>
 #include <mutex>
 
+std::recursive_mutex mtx;
+
 int main() {
-    std::recursive_mutex mtx;
     std::lock_guard<std::recursive_mutex> lck(mtx);
+
+    printf("Works just fine!\n");
+
     return 0;
 }