[INFO] updating cached repository jmageau/colors-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jmageau/colors-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jmageau/colors-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/jmageau/colors-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jmageau/colors-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jmageau/colors-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jmageau/colors-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jmageau/colors-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ddf65c9ab487faff051ddc91b2f68f48844697c6
[INFO] sha for GitHub repo jmageau/colors-rs: ddf65c9ab487faff051ddc91b2f68f48844697c6
[INFO] validating manifest of jmageau/colors-rs on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jmageau/colors-rs on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jmageau/colors-rs
[INFO] finished frobbing jmageau/colors-rs
[INFO] frobbed toml for jmageau/colors-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/jmageau/colors-rs/Cargo.toml
[INFO] started frobbing jmageau/colors-rs
[INFO] finished frobbing jmageau/colors-rs
[INFO] frobbed toml for jmageau/colors-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jmageau/colors-rs/Cargo.toml
[INFO] crate jmageau/colors-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jmageau/colors-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[INFO] the lockfile is outdated, regenerating it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" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing jmageau/colors-rs against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jmageau/colors-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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 71d9948c61a084c19d0c490cb7b21fc9ee85b5567f5ba33f874ad72f6df08c74
[INFO] running `"docker" "start" "-a" "71d9948c61a084c19d0c490cb7b21fc9ee85b5567f5ba33f874ad72f6df08c74"`
[INFO] [stderr]    Compiling colors v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::rand::Rng`
[INFO] [stderr]   --> src/image_functions.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use self::rand::Rng;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/image_functions.rs:36:31
[INFO] [stderr]    |
[INFO] [stderr] 36 |     for r in (0..256).step_by(color_step) {
[INFO] [stderr]    |                               ^^^^^^^^^^ expected usize, found u16
[INFO] [stderr] help: you can convert an `u16` to `usize` and panic if the converted value wouldn't fit
[INFO] [stderr]    |
[INFO] [stderr] 36 |     for r in (0..256).step_by(color_step.try_into().unwrap()) {
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/image_functions.rs:37:35
[INFO] [stderr]    |
[INFO] [stderr] 37 |         for g in (0..256).step_by(color_step) {
[INFO] [stderr]    |                                   ^^^^^^^^^^ expected usize, found u16
[INFO] [stderr] help: you can convert an `u16` to `usize` and panic if the converted value wouldn't fit
[INFO] [stderr]    |
[INFO] [stderr] 37 |         for g in (0..256).step_by(color_step.try_into().unwrap()) {
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/image_functions.rs:38:39
[INFO] [stderr]    |
[INFO] [stderr] 38 |             for b in (0..256).step_by(color_step) {
[INFO] [stderr]    |                                       ^^^^^^^^^^ expected usize, found u16
[INFO] [stderr] help: you can convert an `u16` to `usize` and panic if the converted value wouldn't fit
[INFO] [stderr]    |
[INFO] [stderr] 38 |             for b in (0..256).step_by(color_step.try_into().unwrap()) {
[INFO] [stderr]    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `shuffle` found for type `image_functions::rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]   --> src/image_functions.rs:43:24
[INFO] [stderr]    |
[INFO] [stderr] 43 |     rand::thread_rng().shuffle(colors.as_mut_slices().0);
[INFO] [stderr]    |                        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `choose` found for type `image_functions::rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]   --> src/image_functions.rs:66:44
[INFO] [stderr]    |
[INFO] [stderr] 66 |             let point = rand::thread_rng().choose(&free_neighbours).unwrap().clone();
[INFO] [stderr]    |                                            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 6 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `colors`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "71d9948c61a084c19d0c490cb7b21fc9ee85b5567f5ba33f874ad72f6df08c74"`
[INFO] running `"docker" "rm" "-f" "71d9948c61a084c19d0c490cb7b21fc9ee85b5567f5ba33f874ad72f6df08c74"`
[INFO] [stdout] 71d9948c61a084c19d0c490cb7b21fc9ee85b5567f5ba33f874ad72f6df08c74