avoid repeated calls to metis from "resolve_tac" in case of ultimate failure
avoid repeated calls to metis from "resolve_tac" in case of ultimate failure

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