diff -r 495881aadbff -r 52fbcf7a61f8 src/Pure/Proof/reconstruct.ML
--- a/src/Pure/Proof/reconstruct.ML	Sun Jul 28 15:39:30 2019 +0200
+++ b/src/Pure/Proof/reconstruct.ML	Mon Jul 29 10:26:12 2019 +0200
@@ -379,7 +379,7 @@
 
 fun clean_proof_of ctxt full thm =
   let
-    val (_, prop) =
+    val {prop, ...} =
       Logic.unconstrainT (Thm.shyps_of thm)
         (Logic.list_implies (Thm.hyps_of thm, Thm.prop_of thm));
   in