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Why learn unsafe Rust?

We know that writing code without the guarantees that Rust provides ...

“Use-after-free (UAF), integer overflows, and out of bounds (OOB) reads/writes comprise 90% of vulnerabilities with OOB being the most common.”

— Jeff Vander Stoep and Chong Zhang, Google. "Queue the Hardening Enhancements"

... so why is unsafe part of the language?

Outline

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The unsafe keyword exists because there is no compiler technology available today that makes it obsolete. Compilers cannot verify everything.

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