Shamelessly copy Josiah

source/lib/json/tests/thirdparty/Fuzzer/test/ThreadedLeakTest.cpp

@@ -0,0 +1,18 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// The fuzzer should find a leak in a non-main thread.
+#include <cstdint>
+#include <cstddef>
+#include <thread>
+
+static volatile int *Sink;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  if (Size == 0) return 0;
+  if (Data[0] != 'F') return 0;
+  std::thread T([&] { Sink = new int; });
+  T.join();
+  return 0;
+}
+