computing fact1(5)
in wrapper1-pre:  fact(5)
in wrapper2-pre:  fact(4)
in wrapper1-pre:  fact(3)
in wrapper2-pre:  fact(2)
in wrapper1-pre:  fact(1)
in wrapper2-pre:  fact(0)
in wrapper2-post: fact(0) = 1
in wrapper1-post: fact(1) = 1
in wrapper2-post: fact(2) = 2
in wrapper1-post: fact(3) = 6
in wrapper2-post: fact(4) = 24
in wrapper1-post: fact(5) = 120
fact1(5) = 120