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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 8355e443e..3f661e73e 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -206,6 +206,8 @@ public:
sPrefix,
sOutputSpecified;
+ const Expr::AstSymbols exprSymbols;
+
/**
* If set, force copying files to the Nix store even if they
* already exist there.