Git provides a couple of tools to help you debug issues in your projects. These tools can be extremely useful, especially in the case of a software regression, a software bug which makes a feature stop functioning as intended after a certain revision. If you don't know where the bug is, and there have been dozens or hundreds of commits since the last state where you know the code worked, you'll likely turn to git bisect for help.

The bisect command searches semi-automatically step by step through the project history, trying to find the revision that introduced the bug. In each step, it bisects the history into roughly equal parts, and asks whether there is a bug in the dividing commit. It then uses the answer to eliminate one of the two sections, and reduces the size of the revision range where there can be a commit that introduced the bug.

Suppose version 1.14 of your project worked, but the release candidate, 1.15-rc0, for the new version crashes. You go back...