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-rw-r--r--third_party/nix/src/libexpr/value.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/value.hh b/third_party/nix/src/libexpr/value.hh
index 7308dd3193..cb1b8796cf 100644
--- a/third_party/nix/src/libexpr/value.hh
+++ b/third_party/nix/src/libexpr/value.hh
@@ -247,4 +247,6 @@ typedef std::map<Symbol, Value*, std::less<Symbol>,
                  traceable_allocator<std::pair<const Symbol, Value*>>>
     ValueMap;
 
+std::shared_ptr<Value*> allocRootValue(Value* v);
+
 }  // namespace nix