I wrote: > Sadly, it seems adder[1] is even pickier than mamba: Nope, it was my testing error: I supposed that this patch only affected pg_combinebackup and pg_verifybackup, so I only recompiled those modules not the whole tree. But there's one more place with a json_manifest_per_file_callback callback :-(.
I pushed a quick-hack fix. regards, tom lane