diff -r 23df00d48d6f -r 3f875966c3e1 src/HOL/Library/Tools/termify_lazy.ML
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/HOL/Library/Tools/termify_lazy.ML	Sun Mar 30 13:50:06 2025 +0200
@@ -0,0 +1,16 @@
+(* Author: Pascal Stoop, ETH Zurich
+   Author: Andreas Lochbihler, Digital Asset *)
+
+structure Termify_Lazy =
+struct
+
+fun termify_lazy
+  (_: string -> typ -> term) (_: term -> term -> term)  (_: string -> typ -> term -> term)
+  (_: typ) (_: typ -> typ -> typ) (_: typ -> typ)
+  (term_of: 'a -> term) (T: typ) (x: 'a Lazy.lazy) (_: term) =
+  Const ("Code_Lazy.delay", (HOLogic.unitT --> T) --> Type ("Code_Lazy.lazy", [T])) $
+  (case Lazy.peek x of
+    SOME (Exn.Res x) => absdummy HOLogic.unitT (term_of x)
+  | _ => Const ("Pure.dummy_pattern", HOLogic.unitT --> T));
+
+end