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Add unstable book docs for -Zunsound-mir-opts

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Wesley Wiser
2020-09-28 22:48:07 -04:00
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src/doc/unstable-book/src/compiler-flags/unsound-mir-opts.md
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# `unsound-mir-opts`
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The `-Zunsound-mir-opts` compiler flag enables [MIR optimization passes] which can cause unsound behavior.
This flag should only be used by MIR optimization tests in the rustc test suite.
[MIR optimization passes]: https://rustc-dev-guide.rust-lang.org/mir/optimizations.html