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panic_immediate_abort requires abort as a panic strategy Guide `panic_immediate_abort` users away from `-Cpanic=unwind` and towards `-Cpanic=abort` to avoid an accidental use of the feature with the unwind strategy, e.g., on a targets where unwind is the default. The `-Cpanic=unwind` combination doesn't offer the same benefits, since the code would still be generated under the assumption that functions implemented in Rust can unwind.