You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_c_struct_entry.rb
    path of file: ./repos/jruby/test/mri/fiddle
    
    the code of the file until where you have to start completion: # frozen_string_literal: t
    
    def test_malloc_block
      escaped_struct = nil
      returned = CStructEntity.malloc([TYPE_INT], Fiddle::RUBY_FREE) do |struct|
        assert_equal Fiddle::SIZEOF_INT, struct.size
        assert_equal Fiddle::RUBY_FREE, struct.free.to_i
        escaped_struct = struct
        :returned
      end
      assert_equal :returned, returned
      assert escaped_struct.freed?
    end