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nothing is optimized away, it's just not executed - e.g. the program including semantics of the language is just designed such that it is not executed.

e.g. for Rust/tokio printing B is skipped, because the process exits and cancels the future before the task can print B

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That's what I thought. But then what is the point when no other async function is executed while the caller sleeps for 1 second (presumably, or is it ms?)?

how would one be executed when the function is explicitly waiting?

also it's an example to demonstrate the differences of async implementations of languages, not a excerpt of a production code base

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