lib/yard/handlers/c/mixin_handler.rb in yard-0.9.0 vs lib/yard/handlers/c/mixin_handler.rb in yard-0.9.1

@@ -5,9 +5,15 @@
 
   process do
     statement.source.scan(MATCH) do |klass_var, mixin_var|
       namespace = namespace_for_variable(klass_var)
       ensure_loaded!(namespace)
-      namespace.mixins(:instance) << namespace_for_variable(mixin_var)
+
+      if var = namespace_for_variable(mixin_var)
+        namespace.mixins(:instance) << var
+      else
+        raise YARD::Parser::UndocumentableError,
+          "CRuby mixin for unrecognized variable '#{mixin_var}'"
+      end
     end
   end
 end