Fix value initialized with NULL

    only for < 5.0 since the module is removed for >= 5

Author: bobot

packages/mlcuddidl/mlcuddidl.3.0.8/files/exn_init_val_unit.diff

@@ -0,0 +1,15 @@
+commit a6135f9b75e3923cbd720e4b02b57073b022f1a7
+Author: François Bobot <[email protected]>
+Date:   Thu Nov 6 10:06:16 2025 +0100
+
+    The exn field is a value not a void*
+
+diff --git a/sedscript_c b/sedscript_c
+index 5aa3525..48b86a3 100644
+--- a/sedscript_c
++++ b/sedscript_c
+@@ -13,3 +13,4 @@ s/camlidl_bdd/camlidl_cudd_bdd/g;
+ s/camlidl_add/camlidl_cudd_add/g;
+ s/camlidl_zdd/camlidl_cudd_zdd/g;
+ s/camlidl_vdd/camlidl_cudd_vdd/g;
++s/(\*_c2)\.exn = NULL;/(*_c2).exn = Val_unit;/g;

packages/mlcuddidl/mlcuddidl.3.0.8/opam

@@ -22,6 +22,7 @@ depends: [
 ]
 patches : [
   "compilation_ocaml5.diff" { ocaml:version >= "5" }
+  "exn_init_val_unit.diff"
 ]
 synopsis: "OCaml interface to the CUDD BDD library"
 post-messages: [
@@ -38,4 +39,6 @@ extra-files: [
   ["compilation_ocaml5.diff"
    "sha256=de3fc5fbb81a6a477d6c2b29e133c3228dfb572bd1d9950d84dfd614221004c5"
   ]
+  ["exn_init_val_unit.diff"
+  "sha256=a00ceaaca0aa26b1fabd1cdb893769f5de6c5481ff33331035c6fbf91210b0c7" ]
 ]