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-rw-r--r--third_party/nix/src/libexpr/primops.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/primops.hh b/third_party/nix/src/libexpr/primops.hh
index 8e674509c7c4..6abd0508a09b 100644
--- a/third_party/nix/src/libexpr/primops.hh
+++ b/third_party/nix/src/libexpr/primops.hh
@@ -11,7 +11,7 @@ struct RegisterPrimOp {
   /* You can register a constant by passing an arity of 0. fun
      will get called during EvalState initialization, so there
      may be primops not yet added and builtins is not yet sorted. */
-  RegisterPrimOp(std::string name, size_t arity, PrimOpFun fun);
+  RegisterPrimOp(const std::string& name, size_t arity, PrimOpFun fun);
 };
 
 /* These primops are disabled without enableNativeCode, but plugins