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-rw-r--r--src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index cac8af877071..4e8e7e5f9ca0 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -145,6 +145,7 @@ public:
 
     /* Evaluation the expression, then verify that it has the expected
        type. */
+    inline bool evalBool(Env & env, Expr * e, Value & v);
     inline bool evalBool(Env & env, Expr * e);
     inline void evalAttrs(Env & env, Expr * e, Value & v);