1 files changed, 11 insertions, 0 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 3db4bb66f435..538325601b9e 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -908,6 +908,17 @@ void ExprOpNot::eval(EvalState & state, Env & env, Value & v)
 }
 
 
+void ExprBuiltin::eval(EvalState & state, Env & env, Value & v)
+{
+    // Not a hot path at all, but would be nice to access state.baseEnv directly
+    Env *baseEnv = &env;
+    while (baseEnv->up) baseEnv = baseEnv->up;
+    Bindings::iterator binding = baseEnv->values[0]->attrs->find(name);
+    assert(binding != baseEnv->values[0]->attrs->end());
+    v = *binding->value;
+}
+
+
 void ExprOpEq::eval(EvalState & state, Env & env, Value & v)
 {
     Value v1; e1->eval(state, env, v1);