[INFO] updating cached repository https://github.com/mubiquity/Rust-Nature-of-Code
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0d8e8ca56c9914340affa09702295cd160d7d1f5
[INFO] checking mubiquity/Rust-Nature-of-Code against master#3dbade652ed8ebac70f903e01f51cd92c4e4302c for pr-69880
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmubiquity%2FRust-Nature-of-Code" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mubiquity/Rust-Nature-of-Code on toolchain 3dbade652ed8ebac70f903e01f51cd92c4e4302c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/mubiquity/Rust-Nature-of-Code
[INFO] finished tweaking git repo https://github.com/mubiquity/Rust-Nature-of-Code
[INFO] tweaked toml for git repo https://github.com/mubiquity/Rust-Nature-of-Code written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/mubiquity/Rust-Nature-of-Code already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] fbe77422cd56033b108d1f5766f3d597eb6e2cd69deb0fd243b588d15a42b287
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "fbe77422cd56033b108d1f5766f3d597eb6e2cd69deb0fd243b588d15a42b287"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rand_core v0.1.0-pre.0
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking png v0.11.0
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]     Checking rulinalg v0.4.2
[INFO] [stderr]     Checking rand v0.5.0-pre.0
[INFO] [stderr]     Checking image v0.18.0
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.52.0
[INFO] [stderr]     Checking noise v0.5.1
[INFO] [stderr]     Checking nature_of_code v0.1.0 (/opt/rustwide/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: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: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 25.24s
[INFO] running `"docker" "inspect" "fbe77422cd56033b108d1f5766f3d597eb6e2cd69deb0fd243b588d15a42b287"`
[INFO] running `"docker" "rm" "-f" "fbe77422cd56033b108d1f5766f3d597eb6e2cd69deb0fd243b588d15a42b287"`
[INFO] [stdout] fbe77422cd56033b108d1f5766f3d597eb6e2cd69deb0fd243b588d15a42b287