Video: https://www.youtube.com/watch?v=iV1Z0xYXkck <!-- TRIAGEBOT_START --> <!-- TRIAGEBOT_ASSIGN_START --> This issue has been assigned to @amanjeev via [this comment](https://github.com/rust-lang/rustc-guide/issues/354#issuecomment-506103156). <!-- TRIAGEBOT_ASSIGN_DATA_START$${"user":"amanjeev"}$$TRIAGEBOT_ASSIGN_DATA_END --> <!-- TRIAGEBOT_ASSIGN_END --> <!-- TRIAGEBOT_END -->