--- a/src/HOL/TPTP/ATP_Problem_Import.thy Sun Jan 06 13:44:33 2019 +0100
+++ b/src/HOL/TPTP/ATP_Problem_Import.thy Sun Jan 06 15:04:34 2019 +0100
@@ -8,7 +8,7 @@
imports Complex_Main TPTP_Interpret "HOL-Library.Refute"
begin
-ML_file "sledgehammer_tactics.ML"
+ML_file \<open>sledgehammer_tactics.ML\<close>
ML \<open>Proofterm.proofs := 0\<close>
@@ -18,7 +18,7 @@
declare [[unify_search_bound = 60]]
declare [[unify_trace_bound = 60]]
-ML_file "atp_problem_import.ML"
+ML_file \<open>atp_problem_import.ML\<close>
(*
ML {* ATP_Problem_Import.isabelle_tptp_file @{theory} 50 "$TPTP/Problems/PUZ/PUZ107^5.p" *}