1 files changed, 9 insertions, 0 deletions
diff --git a/build2/variable.ixx b/build2/variable.ixx
index 3184108..76a52c1 100644
--- a/build2/variable.ixx
+++ b/build2/variable.ixx
@@ -86,6 +86,15 @@ namespace build2
     return v.as<names> ();
   }
 
+  template <>
+  inline names&
+  cast (value& v)
+  {
+    assert (!v.null () &&
+            (v.type == nullptr || v.type == &value_traits<names>::value_type));
+    return v.as<names> ();
+  }
+
   template <typename T>
   inline const T&
   cast (const value& v)