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-rw-r--r--build/variable1
1 files changed, 1 insertions, 0 deletions
diff --git a/build/variable b/build/variable
index ae4c7b3..901f5c8 100644
--- a/build/variable
+++ b/build/variable
@@ -9,6 +9,7 @@
#include <memory> // unique_ptr
#include <utility> // move()
#include <cassert>
+#include <functional> // hash
#include <typeindex>
#include <unordered_set>