1.1 --- a/src/HOL/Decision_Procs/approximation.ML	Wed Sep 21 17:56:25 2016 +0200
     1.2 +++ b/src/HOL/Decision_Procs/approximation.ML	Tue Dec 06 17:21:34 2016 +0100
     1.3 @@ -43,7 +43,7 @@
     1.4    end
     1.5  
     1.6  fun approximation_conv ctxt ct =
     1.7 -  approximation_oracle (Proof_Context.theory_of ctxt, Thm.term_of ct |> tap (tracing o Syntax.string_of_term ctxt));
     1.8 +  approximation_oracle (Proof_Context.theory_of ctxt, Thm.term_of ct);
     1.9  
    1.10  fun approximate ctxt t =
    1.11    approximation_oracle (Proof_Context.theory_of ctxt, t)