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> As long as the time is much larger than it takes to handle the old statement limit it is preserved.

As a library developer, how can I know that?

> The old version might have prevented your code from compiling as mentioned in the notes.

Does it mean that rustc tracks function BC? I think I've misunderstood you.

Rustc guarantees code that compile before continues to compile.

In this case they modified the old hard error that you could opt out of into a deny by default lint.

Additionally if you opt out of the lint you get progress notifications of how much work has been done.

Looks like the whole thing is still statement based to avoid slow machines breaking on a timer.