[INFO] updating cached repository cwbriones/markov_rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cwbriones/markov_rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cwbriones/markov_rs" "work/ex/beta-1.37-6/sources/1.36.0/gh/cwbriones/markov_rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/cwbriones/markov_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cwbriones/markov_rs" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cwbriones/markov_rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cwbriones/markov_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e7ac6d671a0bc6d3862e148db4efc7727f222a15
[INFO] sha for GitHub repo cwbriones/markov_rs: e7ac6d671a0bc6d3862e148db4efc7727f222a15
[INFO] validating manifest of cwbriones/markov_rs on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cwbriones/markov_rs on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cwbriones/markov_rs
[INFO] finished frobbing cwbriones/markov_rs
[INFO] frobbed toml for cwbriones/markov_rs written to work/ex/beta-1.37-6/sources/1.36.0/gh/cwbriones/markov_rs/Cargo.toml
[INFO] started frobbing cwbriones/markov_rs
[INFO] finished frobbing cwbriones/markov_rs
[INFO] frobbed toml for cwbriones/markov_rs written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cwbriones/markov_rs/Cargo.toml
[INFO] crate cwbriones/markov_rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/cwbriones/markov_rs/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cwbriones/markov_rs against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cwbriones/markov_rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] eb7916f6b9edde17b0f40595ca579324c4b7edb170002dad129d3236977fc71b
[INFO] running `"docker" "start" "-a" "eb7916f6b9edde17b0f40595ca579324c4b7edb170002dad129d3236977fc71b"`
[INFO] [stderr]    Compiling markov_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `rand::Closed01`
[INFO] [stderr]   --> src/main.rs:85:9
[INFO] [stderr]    |
[INFO] [stderr] 85 |     use rand::Closed01;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ no `Closed01` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `choose` found for type `&mut R` in the current scope
[INFO] [stderr]   --> src/main.rs:75:26
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let window = rng.choose(&windows).map(|w| *w).unwrap();
[INFO] [stderr]    |                          ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]    = note: the following traits define an item `choose`, perhaps you need to implement one of them:
[INFO] [stderr]            candidate #1: `rand::prelude::SliceRandom`
[INFO] [stderr]            candidate #2: `rand::prelude::IteratorRandom`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `markov_rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "eb7916f6b9edde17b0f40595ca579324c4b7edb170002dad129d3236977fc71b"`
[INFO] running `"docker" "rm" "-f" "eb7916f6b9edde17b0f40595ca579324c4b7edb170002dad129d3236977fc71b"`
[INFO] [stdout] eb7916f6b9edde17b0f40595ca579324c4b7edb170002dad129d3236977fc71b