> On 14 Oct 2018, at 18:49, Akim Demaille <[email protected]> wrote: > >> Le 14 oct. 2018 à 18:13, Hans Åberg <[email protected]> a écrit : >> >> POSIX probably got it from there through copy-and-paste, then. > > Right. > >> So rules with empty RHS do not have any default value. What happen with >> Bison’s default value in such a case, that is, what does it get when there >> is no $1? > > Garbage.
So then one can choose whatever, like simplest or most efficient in the implementation, or conforming to the other variations.
