Move make_with_expr to update_exprt

This will eventually remove one of the functions from the expr_util
translation unit, which is supposed to be deprecated.

src/util/expr_util.cpp

@@ -68,33 +68,7 @@ exprt make_binary(const exprt &expr)
 
 with_exprt make_with_expr(const update_exprt &src)
 {
-  const exprt::operandst &designator=src.designator();
-  PRECONDITION(!designator.empty());
-
-  with_exprt result{exprt{}, exprt{}, exprt{}};
-  exprt *dest=&result;
-
-  for(const auto &expr : designator)
-  {
-    with_exprt tmp{exprt{}, exprt{}, exprt{}};
-
-    if(expr.id() == ID_index_designator)
-    {
-      tmp.where() = to_index_designator(expr).index();
-    }
-    else if(expr.id() == ID_member_designator)
-    {
-      // irep_idt component_name=
-      //  to_member_designator(*it).get_component_name();
-    }
-    else
-      UNREACHABLE;
-
-    *dest=tmp;
-    dest=&to_with_expr(*dest).new_value();
-  }
-
-  return result;
+  return src.make_with_expr();
 }
 
 exprt is_not_zero(

src/util/expr_util.h

@@ -41,6 +41,7 @@ bool is_assignable(const exprt &);
 exprt make_binary(const exprt &);
 
 /// converts an update expr into a (possibly nested) with expression
+DEPRECATED(SINCE(2024, 9, 10, "use update_exprt::make_with_expr() instead"))
 with_exprt make_with_expr(const update_exprt &);
 
 /// converts a scalar/float expression to C/C++ Booleans

src/util/std_expr.cpp

@@ -191,6 +191,37 @@ void let_exprt::validate(const exprt &expr, const validation_modet vm)
   }
 }
 
+with_exprt update_exprt::make_with_expr() const
+{
+  const exprt::operandst &designators = designator();
+  PRECONDITION(!designators.empty());
+
+  with_exprt result{exprt{}, exprt{}, exprt{}};
+  exprt *dest = &result;
+
+  for(const auto &expr : designators)
+  {
+    with_exprt tmp{exprt{}, exprt{}, exprt{}};
+
+    if(expr.id() == ID_index_designator)
+    {
+      tmp.where() = to_index_designator(expr).index();
+    }
+    else if(expr.id() == ID_member_designator)
+    {
+      // irep_idt component_name=
+      //  to_member_designator(*it).get_component_name();
+    }
+    else
+      UNREACHABLE;
+
+    *dest = tmp;
+    dest = &to_with_expr(*dest).new_value();
+  }
+
+  return result;
+}
+
 exprt binding_exprt::instantiate(const operandst &values) const
 {
   // number of values must match the number of bound variables

src/util/std_expr.h

@@ -2698,6 +2698,9 @@ class update_exprt : public ternary_exprt
     return op2();
   }
 
+  /// converts an update expr into a (possibly nested) with expression
+  with_exprt make_with_expr() const;
+
   static void check(
     const exprt &expr,
     const validation_modet vm = validation_modet::INVARIANT)