reverted "id" change: The problem is rather that the "%c. f c" argument sometimes gets eta-reduced
reverted "id" change: The problem is rather that the "%c. f c" argument sometimes gets eta-reduced

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