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-rw-r--r--src/libexpr/nixexpr.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 4dc235c8e116..6e67e5ebd1cd 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -19,6 +19,9 @@ MakeError(TypeError, EvalError)
    normals forms efficiently. */
 typedef ATerm Expr;
 
+typedef ATerm DefaultValue;
+typedef ATerm ValidValues;
+
 typedef ATerm Pos;