[5.1 Compatibility library] Add missing #include

DougGregor · DougGregor · commit 833d2cd9d395 · 2020-05-11T17:21:10.000-07:00
diff --git a/stdlib/toolchain/Compatibility51/Concurrent.h b/stdlib/toolchain/Compatibility51/Concurrent.h
@@ -20,6 +20,7 @@
 #include <iterator>
 #include <algorithm>
 #include <atomic>
+#include <cassert>
 #include <functional>
 #include <pthread.h>
 #include <stdint.h>
