Hi Martin, I strongly suspect that I haven't followed the discussion on the list closely enough, but your 'ma/unpack-trees-free-msgs' branch in 'pu', seems to define string_list_appendf() but then never call it. This is despite commit 40ebd6c7b0 ("string-list: provide `string_list_appendf()`", 2018-05-20) claiming that: 'The next commit will add a user'. ;-) Have I missed something? ATB, Ramsay Jones