diff -r 4dfb7c937126 -r 2bc39c80a95d src/Pure/Thy/export_theory.scala
--- a/src/Pure/Thy/export_theory.scala	Tue Dec 03 15:59:01 2019 +0100
+++ b/src/Pure/Thy/export_theory.scala	Tue Dec 03 16:40:04 2019 +0100
@@ -284,9 +284,7 @@
     typargs: List[String],
     typ: Term.Typ,
     abbrev: Option[Term.Term],
-    propositional: Boolean,
-    primrec_types: List[String],
-    corecursive: Boolean)
+    propositional: Boolean)
   {
     def cache(cache: Term.Cache): Const =
       Const(entity.cache(cache),
@@ -294,25 +292,22 @@
         typargs.map(cache.string(_)),
         cache.typ(typ),
         abbrev.map(cache.term(_)),
-        propositional,
-        primrec_types.map(cache.string(_)),
-        corecursive)
+        propositional)
   }
 
   def read_consts(provider: Export.Provider): List[Const] =
     provider.uncompressed_yxml(export_prefix + "consts").map((tree: XML.Tree) =>
       {
         val (entity, body) = decode_entity(Kind.CONST, tree)
-        val (syntax, (args, (typ, (abbrev, (propositional, (primrec_types, corecursive)))))) =
+        val (syntax, (typargs, (typ, (abbrev, propositional)))) =
         {
           import XML.Decode._
           pair(decode_syntax,
             pair(list(string),
               pair(Term_XML.Decode.typ,
-                pair(option(Term_XML.Decode.term), pair(bool,
-                  pair(list(string), bool))))))(body)
+                pair(option(Term_XML.Decode.term), bool))))(body)
         }
-        Const(entity, syntax, args, typ, abbrev, propositional, primrec_types, corecursive)
+        Const(entity, syntax, typargs, typ, abbrev, propositional)
       })