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-rw-r--r--src/libutil/experimental-features.hh8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/libutil/experimental-features.hh b/src/libutil/experimental-features.hh
index 507b0cc06..faf2e9398 100644
--- a/src/libutil/experimental-features.hh
+++ b/src/libutil/experimental-features.hh
@@ -3,7 +3,7 @@
#include "comparator.hh"
#include "error.hh"
-#include "nlohmann/json_fwd.hpp"
+#include "json-utils.hh"
#include "types.hh"
namespace nix {
@@ -94,4 +94,10 @@ public:
void to_json(nlohmann::json &, const ExperimentalFeature &);
void from_json(const nlohmann::json &, ExperimentalFeature &);
+/**
+ * It is always rendered as a string
+ */
+template<>
+struct json_avoids_null<ExperimentalFeature> : std::true_type {};
+
}