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-rw-r--r--third_party/nix/src/nix/eval.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/nix/eval.cc b/third_party/nix/src/nix/eval.cc
index 5f26aa14c0..a78f5b34fa 100644
--- a/third_party/nix/src/nix/eval.cc
+++ b/third_party/nix/src/nix/eval.cc
@@ -9,7 +9,7 @@
 
 using namespace nix;
 
-struct CmdEval : MixJSON, InstallableCommand {
+struct CmdEval final : MixJSON, InstallableCommand {
   bool raw = false;
 
   CmdEval() { mkFlag(0, "raw", "print strings unquoted", &raw); }