src/Pure/pure_setup.ML

 
 install_pp (make_pp ["Thm", "thm"] ProofDisplay.pprint_thm);
 install_pp (make_pp ["Thm", "cterm"] ProofDisplay.pprint_cterm);
 install_pp (make_pp ["Thm", "ctyp"] ProofDisplay.pprint_ctyp);
 install_pp (make_pp ["Context", "theory"] Context.pprint_thy);
+install_pp (make_pp ["Context", "theory_ref"] Context.pprint_thy_ref);
 install_pp (make_pp ["Context", "proof"] ProofDisplay.pprint_context);
 install_pp (make_pp ["Syntax", "ast"] Syntax.pprint_ast);
 install_pp (make_pp ["typ"] (ProofDisplay.pprint_typ Pure.thy));
 install_pp (make_pp ["Path", "T"] (Pretty.pprint o Pretty.str o quote o Path.implode));
 install_pp (make_pp ["File", "ident"] (Pretty.pprint o Pretty.str o quote o File.rep_ident));