src/HOL/MiniML/Maybe.ML

 br split_option_case 1;
 qed "split_option_bind";
 
 goal thy
   "((option_bind m f) = None) = ((m=None) | (? p. m = Some p & f p = None))";
-by(simp_tac (!simpset addsplits [split_option_bind]) 1);
+by(simp_tac (simpset() addsplits [split_option_bind]) 1);
 qed "option_bind_eq_None";
 
 Addsimps [option_bind_eq_None];
 
 (* auxiliary lemma *)
 goal Maybe.thy "(y = Some x) = (Some x = y)";
-by( simp_tac (!simpset addsimps [eq_sym_conv]) 1);
+by( simp_tac (simpset() addsimps [eq_sym_conv]) 1);
 qed "rotate_Some";