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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 f004691aa4
and changes to `-Zbuild-std-features=optimize_for_size`.
Alternatively, we can just drop this test.