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-rw-r--r--src/libexpr/nixexpr.hh7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 61eb81fab138..2ae2e2e96fcf 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -248,6 +248,13 @@ struct ExprOpNot : Expr
     COMMON_METHODS
 };
 
+struct ExprBuiltin : Expr
+{
+    Symbol name;
+    ExprBuiltin(Symbol name) : name(name) { };
+    COMMON_METHODS
+};
+
 #define MakeBinOp(name, s) \
     struct Expr##name : Expr \
     { \