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Rollup merge of #22970 - pnkfelix:fsk-robust-backtrace-test-against-e…
…nv, r=alexcrichton Make `test/run-pass/backtrace.rs` more robust about own host environment Namely, I have been annoyed in the past when I have done `RUST_BACKTRACE=1 make check` only to discover (again) that such a trick causes this test to fail, because it assumes that the `RUST_BACKTRACE` environment variable is not set. Fix #22870
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