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Previously, the queue length was constantly decreasing as we built crates, which
meant that we were incorrectly displaying the progress bar. In debug builds,
this even led to panics (due to underflow on subtraction).
Not sure if we can add a test case for this. I have made the panic unconditional on release/debug though by explicitly checking that current is less than the maximum for the progress bar.
Fixes #7731 (comment).