Create a generic type for types with an error list

boot/result.cc

@@ -35,5 +35,15 @@ namespace boot
     {
         return this->position.column;
     }
+
+    error_container::error_container(const char *input_file)
+        : input_file(input_file)
+    {
+    }
+
+    std::deque<std::unique_ptr<error>>& error_container::errors()
+    {
+        return m_errors;
+    }
 }
 }