1 files changed, 12 insertions, 0 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index d1c398a34831..92683fcac53d 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -245,6 +245,18 @@ Expr primToString(EvalState & state, Expr arg)
 }
 
 
+Expr primTrue(EvalState & state)
+{
+    return ATmake("Bool(True)");
+}
+
+
+Expr primFalse(EvalState & state)
+{
+    return ATmake("Bool(False)");
+}
+
+
 Expr primNull(EvalState & state)
 {
     return ATmake("Null");