1.1 --- a/src/HOL/ex/Puzzle.ML	Wed Nov 17 15:03:23 1999 +0100
     1.2 +++ b/src/HOL/ex/Puzzle.ML	Thu Nov 18 08:50:19 1999 +0100
     1.3 @@ -15,10 +15,11 @@
     1.4  by (rtac allI 1);
     1.5  by (rename_tac "i" 1);
     1.6  by (exhaust_tac "i" 1);
     1.7 - by Auto_tac;
     1.8 + by (Asm_simp_tac 1);
     1.9 +by (rtac impI 1);
    1.10  by (subgoal_tac "f(nat) <= f(f(nat))" 1);
    1.11   by (Blast_tac 2);
    1.12 -by (blast_tac (claset() addIs [Suc_leI,le_less_trans]) 1);
    1.13 +by (blast_tac (claset() addSDs [spec] addIs [Suc_leI,le_less_trans]) 1);
    1.14  val lemma = result() RS spec RS mp;
    1.15  
    1.16  Goal "n <= f(n)";