Nested match-statements with tuple outputs causes template error

[Per Östlund]

MetaModelica code like this:

(b, s) := match s
  case "test"
    then match s
      case "test" then (true, "test");
    end match;
end match;

gives the error:

[CodegenCFunctions.tpl:3547:14-3547:14:writable] Error: Template error: expTypeShort: (Boolean, String).

[Per Östlund]

Test case