Program.all_inherits has a FIXME asking for docs. But its definition is a little odd: it returns a list of the given program's inherits, and everything they inherit - but not recursively.

Not quite... Take a closer look at the loop -- It isn't a foreach()...

I could document it as such, but it strikes me that this should be recursive, similar to inherit_tree but returning a flat array. Example implementation in branch rosuav/pgm_all_inherits - what do you think?

No need for a new implementation; the current already does it.

/grubba