package extract func _() { a := 1 a = 5 //@mark(exSt0, "a") a = a + 2 //@mark(exEn0, "2") //@extractfunc(exSt0, exEn0) b := a * 2 //@mark(exB, " b") _ = 3 + 4 //@mark(exEnd, "4") //@extractfunc(exB, exEnd) }