[INFO] cloning repository mubiquity/Rust-Nature-of-Code
[INFO] running `"git" "clone" "--bare" "git://github.com/mubiquity/Rust-Nature-of-Code.git" "work/cache/sources/gh/mubiquity/Rust-Nature-of-Code"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/mubiquity/Rust-Nature-of-Code'...
[INFO] running `"git" "clone" "work/cache/sources/gh/mubiquity/Rust-Nature-of-Code" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mubiquity/Rust-Nature-of-Code"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mubiquity/Rust-Nature-of-Code'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mubiquity/Rust-Nature-of-Code" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mubiquity/Rust-Nature-of-Code"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mubiquity/Rust-Nature-of-Code'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0d8e8ca56c9914340affa09702295cd160d7d1f5
[INFO] sha for GitHub repo mubiquity/Rust-Nature-of-Code: 0d8e8ca56c9914340affa09702295cd160d7d1f5
[INFO] validating manifest of mubiquity/Rust-Nature-of-Code on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mubiquity/Rust-Nature-of-Code on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mubiquity/Rust-Nature-of-Code
[INFO] finished frobbing mubiquity/Rust-Nature-of-Code
[INFO] frobbed toml for mubiquity/Rust-Nature-of-Code written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mubiquity/Rust-Nature-of-Code/Cargo.toml
[INFO] started frobbing mubiquity/Rust-Nature-of-Code
[INFO] finished frobbing mubiquity/Rust-Nature-of-Code
[INFO] frobbed toml for mubiquity/Rust-Nature-of-Code written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mubiquity/Rust-Nature-of-Code/Cargo.toml
[INFO] crate mubiquity/Rust-Nature-of-Code already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mubiquity/Rust-Nature-of-Code against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-0/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mubiquity/Rust-Nature-of-Code:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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=forbid" "-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" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 3d7811cc5d21040adfc3dc90ea00377345f6f2783e3d6d54506dd0b13d5cd486
[INFO] running `"docker" "start" "-a" "3d7811cc5d21040adfc3dc90ea00377345f6f2783e3d6d54506dd0b13d5cd486"`
[INFO] [stderr]     Checking rand_core v0.1.0-pre.0
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]     Checking rulinalg v0.4.2
[INFO] [stderr]     Checking pistoncore-input v0.20.0
[INFO] [stderr]     Checking gl v0.10.0
[INFO] [stderr]     Checking image v0.18.0
[INFO] [stderr]     Checking rand v0.5.0-pre.0
[INFO] [stderr]     Checking pistoncore-window v0.31.0
[INFO] [stderr]     Checking noise v0.5.1
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.52.0
[INFO] [stderr]     Checking pistoncore-event_loop v0.36.0
[INFO] [stderr]     Checking pistoncore-glutin_window v0.45.3
[INFO] [stderr]     Checking piston v0.36.0
[INFO] [stderr]     Checking nature_of_code v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/random_walker.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         let mut walker = Walker::random(&settings.get_size());
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/random_walker.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for mut walker in walkers.iter_mut() {
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/random_walker.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |         for mut val in color.iter_mut() {
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/noise_walker.rs:36:13
[INFO] [stderr]    |
[INFO] [stderr] 36 |         for mut walker in walkers.iter_mut() {
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/noise_walker.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         for mut col in color.iter_mut() {
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/random_walker.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         let mut walker = Walker::random(&settings.get_size());
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/random_walker.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for mut walker in walkers.iter_mut() {
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/random_walker.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |         for mut val in color.iter_mut() {
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/noise_walker.rs:36:13
[INFO] [stderr]    |
[INFO] [stderr] 36 |         for mut walker in walkers.iter_mut() {
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/noise_walker.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         for mut col in color.iter_mut() {
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.52s
[INFO] running `"docker" "inspect" "3d7811cc5d21040adfc3dc90ea00377345f6f2783e3d6d54506dd0b13d5cd486"`
[INFO] running `"docker" "rm" "-f" "3d7811cc5d21040adfc3dc90ea00377345f6f2783e3d6d54506dd0b13d5cd486"`
[INFO] [stdout] 3d7811cc5d21040adfc3dc90ea00377345f6f2783e3d6d54506dd0b13d5cd486