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The test exercises a regression of extra `-Zbuild-std-features` overriding the entire default-features set. However, after rust-lang/rust 146317 panic_immediate_abort became a codegen flag not a Cargo feature anymore. We pick another `optimize_for_size` feature flag to ensure the regression case is still covered. To verify `optimize_for_size` actually triggers the regression, git revert f004691aa41449fa06b764683385558edee51428 and changes to `-Zbuild-std-features=optimize_for_size`. Alternatively, we can just drop this test.