Index: libcfa/prelude/builtins.c
===================================================================
--- libcfa/prelude/builtins.c	(revision b42d0ea45e1cc153db36fdabba56bbc5035f39a6)
+++ libcfa/prelude/builtins.c	(revision c99a0d1d83786675887a035019c801e7cbfeed0c)
@@ -10,6 +10,6 @@
 // Created On       : Fri Jul 21 16:21:03 2017
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Wed Jul 21 13:31:34 2021
-// Update Count     : 129
+// Last Modified On : Sat Aug 14 08:45:54 2021
+// Update Count     : 133
 //
 
@@ -107,4 +107,8 @@
 #endif // __SIZEOF_INT128__
 
+// for-control index constraints
+// forall( T | { void ?{}( T &, zero_t ); void ?{}( T &, one_t ); T ?+=?( T &, T ); T ?-=?( T &, T ); int ?<?( T, T ); } )
+// static inline T __for_control_index_constraints__( T t ) { return t; }
+
 // exponentiation operator implementation