fix bug where "==" was used instead of "HOL.eq"
fix bug where "==" was used instead of "HOL.eq"

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