1 files changed, 15 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/function-trace.hh b/third_party/nix/src/libexpr/function-trace.hh
new file mode 100644
index 000000000000..472f2045ed65
--- /dev/null
+++ b/third_party/nix/src/libexpr/function-trace.hh
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "eval.hh"
+
+#include <chrono>
+
+namespace nix {
+
+struct FunctionCallTrace
+{
+    const Pos & pos;
+    FunctionCallTrace(const Pos & pos);
+    ~FunctionCallTrace();
+};
+}