Bread crumbs
Debugging statements inserted into a program that emit output or log indicators of the program's state to a file so you can see where it dies or pin down the cause of surprising behaviour.
The term is probably a reference to the Hansel and Gretel story from the Brothers Grimm; in several variants, a character leaves a trail of bread crumbs so as not to get lost in the woods.
[Jargon File]
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