https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80294
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I don't know what it means to have NULL elt and it looks weird to me, but I'm not a C++ FE maintainer, I assume Jason and/or Nathan will review your patch and know what it means. Just grepping through FOR_EACH_CONSTRUCTOR_VALUE reveals that many don't really accept NULL elements (e.g. use TREE_TYPE on the elements), while some others could cope with it (e.g. when value_dependent_expression_p or type_dependent_expression_p is called on it).
