[magicmouse]

Although the language i have been working on includes time travel as a built-in feature, i find that i almost never use it, because in a deductive language, it is not that easy to create a bug.

Time travel is great for understanding someone else's large program, so that you can see where it goes as it is running. In large projects the instruction pointer is hop around madly throughout the code, and seeing where it goes like the path of a bird is rather handy.