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-rw-r--r--third_party/nix/src/libexpr/json-to-value.cc8
1 files changed, 8 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/json-to-value.cc b/third_party/nix/src/libexpr/json-to-value.cc
index 66912aa084e6..043f8c64cd30 100644
--- a/third_party/nix/src/libexpr/json-to-value.cc
+++ b/third_party/nix/src/libexpr/json-to-value.cc
@@ -106,6 +106,14 @@ class JSONSax : nlohmann::json_sax<json> {
     return handle_value<void(Value&, const char*)>(mkString, val.c_str());
   }
 
+#if NLOHMANN_JSON_VERSION_MAJOR >= 3 && NLOHMANN_JSON_VERSION_MINOR >= 8
+  bool binary(binary_t&) {
+    // This function ought to be unreachable
+    assert(false);
+    return true;
+  }
+#endif
+
   bool start_object(std::size_t) override {
     rs = std::make_unique<JSONObjectState>(std::move(rs));
     return true;