Index: libcfa/prelude/builtins.c
===================================================================
--- libcfa/prelude/builtins.c	(revision 50be644477314cc6ae43b906adadec8e8f5b156e)
+++ libcfa/prelude/builtins.c	(revision 283fbddd969525e9694abcb709bc45b284c7f7ea)
@@ -107,8 +107,4 @@
 } // ?{}
 #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; }
 
 
@@ -155,10 +151,4 @@
 	unsigned long long int ?\=?( unsigned long long int & x, unsigned long long int y ) { x = x \ y; return x; }
 } // distribution
-
-// struct quasi_void {};
-// static inline void ?{}( quasi_void &) {}
-// static inline void ?{}( quasi_void &, quasi_void ) {}
-// static inline void ^?{}( quasi_void &) {}
-// static inline quasi_void ?=?( quasi_void &, quasi_void & _src ) { return _src; }