repeat/0

If it is asked to Redo then it will keep on succeeding.

 
test:-

		       repeat,

		       write(hello),

		       fail.

The goal test produces the output:

 
hellohellohellohellohellohellohellohellohello...

repeat/0 behaves as if it were defined in Prolog as:

 
repeat.

repeat:-

		       repeat.