Sitting in Oslo right now. We are now nailing down the new YAML diagnostic syntax. Tentatively we have something like this:
TAP version 14
ok 1 - Input file opened
not ok 2 - First line of the input valid
source: is $line, 'Fnible', 'First line of the input valid';
There are other keys like 'timestamp', url', 'display' and similar that will likely be included. All are optional.