Video: https://www.youtube.com/watch?v=9OIA7DTFQWU <!-- TRIAGEBOT_START --> <!-- TRIAGEBOT_ASSIGN_START --> This issue has been assigned to @togiberlin via [this comment](https://github.com/rust-lang/rustc-guide/issues/358#issuecomment-530834956). <!-- TRIAGEBOT_ASSIGN_DATA_START$${"user":"togiberlin"}$$TRIAGEBOT_ASSIGN_DATA_END --> <!-- TRIAGEBOT_ASSIGN_END --> <!-- TRIAGEBOT_END -->