1 files changed, 10 insertions, 0 deletions
diff --git a/src/libexpr/eval-inline.hh b/src/libexpr/eval-inline.hh
index c8d83814f3ca..b470fa315d61 100644
--- a/src/libexpr/eval-inline.hh
+++ b/src/libexpr/eval-inline.hh
@@ -78,5 +78,15 @@ inline void EvalState::forceList(Value & v, const Pos & pos)
         throwTypeError("value is %1% while a list was expected, at %2%", v, pos);
 }
 
+inline bool EvalState::isFunctor(Value& fun)
+{
+    if (fun.type == tAttrs) {
+      auto found = fun.attrs->find(sFunctor);
+      if (found != fun.attrs->end()) {
+        return true;
+      }
+    }
+    return false;
+}
 
 }