1 files changed, 12 insertions, 0 deletions
diff --git a/include/elna/boot/name_analysis.h b/include/elna/boot/name_analysis.h
index feef3bf..40bdf16 100644
--- a/include/elna/boot/name_analysis.h
+++ b/include/elna/boot/name_analysis.h
@@ -81,6 +81,18 @@ namespace elna::boot
     };
 
     /**
+     * Direct \c const \c const T is not valid — write it once.
+     * Merging through an alias is fine (C++ rule).
+     */
+    class double_const_error : public error
+    {
+    public:
+        explicit double_const_error(const source_position position);
+
+        std::string what() const override;
+    };
+
+    /**
      * Origin of a field in a composite type.
      */
     struct field_origin