variant_fixes: preserve internal state, mark skolem only for body mode; import_inst: actually observe is_open flag (cf. variant_fixes);
variant_fixes: preserve internal state, mark skolem only for body mode;
import_inst: actually observe is_open flag (cf. variant_fixes);

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle