Fix compilation issue related to Fibers WhenN

Summary: In a separate diff, I made changes that switched include order, and suddently this file failed to compile. This fixes it.

Reviewed By: andriigrynenko

Differential Revision: D3574775

fbshipit-source-id: 02422d803708aa8490123d19aab5a16c10fdc36e

diff --git a/folly/fibers/WhenN.h b/folly/fibers/WhenN.h
index 6f54babad41be34e32cf339401f27da44494ec9a..217ad90a8bdfb68506c01ca74cfb935b05865e13 100644 (file)
--- a/folly/fibers/WhenN.h
+++ b/folly/fibers/WhenN.h
@@ -15,6 +15,8 @@
  */
 #pragma once
 
+#include <memory>
+
 namespace folly {
 namespace fibers {