reachable: recovered reverse post-order (lost in 73ad4884441f), which is expected for all_preds/all_succs and required for topological_order;
header {* Plain HOL *}
theory Plain
imports Datatype FunDef Record Extraction Divides
begin
text {*
Plain bootstrap of fundamental HOL tools and packages; does not
include @{text Hilbert_Choice}.
*}
ML {* path_add "~~/src/HOL/Library" *}
end