1rustc 1.21.0 (3b72af97e 2017-10-09) 2binary: rustc 3commit-hash: 3b72af97e42989b2fe104d8edbaee123cdf7c58f 4commit-date: 2017-10-09 5host: x86_64-unknown-linux-gnu 6release: 1.21.0 7LLVM version: 4.0 8