Include <optional> where required

Summary: Using std::optional requires including it first. Reviewed By: yfeldblum Differential Revision: D25704383 fbshipit-source-id: 755dfd4a6dec9695cb0ed156166d13b550fd8b40

Include <optional> where required
Summary: Using std::optional requires including it first. Reviewed By: yfeldblum Differential Revision: D25704383 fbshipit-source-id: 755dfd4a6dec9695cb0ed156166d13b550fd8b40
33df23f4 · Orvid King · Facebook GitHub Bot · 184d54bb · 33df23f4
Commit 33df23f4 authored Dec 28, 2020 by Orvid King Committed by Facebook GitHub Bot Dec 28, 2020
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folly/test/MapUtilTest.cpp folly/test/MapUtilTest.cpp +1 -0

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--- a/folly/test/MapUtilTest.cpp
+++ b/folly/test/MapUtilTest.cpp
@@ -18,6 +18,7 @@

 #include <cstddef>
 #include <map>
+#include <optional>
 #include <unordered_map>

 #include <folly/Traits.h>