bread crumbs: n. 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 behavior. The term is probably a reference to the Hansel
and Gretel story from the Brothers Grimm or the older French
folktale of Thumbelina; in several variants of these, a character
leaves a trail of bread crumbs so as not to get lost in the woods.
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