[INFO] updating cached repository YoshikuniJujo/learn_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/YoshikuniJujo/learn_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/YoshikuniJujo/learn_rust" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/YoshikuniJujo/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/YoshikuniJujo/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/YoshikuniJujo/learn_rust" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/YoshikuniJujo/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/YoshikuniJujo/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7089594ac8104a4dd77f51e5f4f1a1108b8969d5
[INFO] sha for GitHub repo YoshikuniJujo/learn_rust: 7089594ac8104a4dd77f51e5f4f1a1108b8969d5
[INFO] validating manifest of YoshikuniJujo/learn_rust on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of YoshikuniJujo/learn_rust on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing YoshikuniJujo/learn_rust
[INFO] finished frobbing YoshikuniJujo/learn_rust
[INFO] frobbed toml for YoshikuniJujo/learn_rust written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/YoshikuniJujo/learn_rust/Cargo.toml
[INFO] started frobbing YoshikuniJujo/learn_rust
[INFO] finished frobbing YoshikuniJujo/learn_rust
[INFO] frobbed toml for YoshikuniJujo/learn_rust written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/YoshikuniJujo/learn_rust/Cargo.toml
[INFO] crate YoshikuniJujo/learn_rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking YoshikuniJujo/learn_rust against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-3/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/YoshikuniJujo/learn_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 700443868a007cf69e04f0d3afb91dff3ee89f28546bf396f06daf65048d8adc
[INFO] running `"docker" "start" "-a" "700443868a007cf69e04f0d3afb91dff3ee89f28546bf396f06daf65048d8adc"`
[INFO] [stderr]     Checking learn_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]  --> src/mutability.rs:9:10
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut x = 5;
[INFO] [stderr]   |             ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `y` is assigned to, but never used
[INFO] [stderr]   --> src/mutability.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut y = &mut x;
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr]    = note: consider using `_y` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/mutability.rs:14:2
[INFO] [stderr]    |
[INFO] [stderr] 14 |     y = &mut z;
[INFO] [stderr]    |     ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `foo`
[INFO] [stderr]   --> src/ownership.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn foo(v: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `x`
[INFO] [stderr]  --> src/mutability.rs:4:2
[INFO] [stderr]   |
[INFO] [stderr] 4 |     x: i32,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `foo`
[INFO] [stderr]   --> src/ownership.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn foo(v: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]  --> src/mutability.rs:9:10
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut x = 5;
[INFO] [stderr]   |             ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `y` is assigned to, but never used
[INFO] [stderr]   --> src/mutability.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut y = &mut x;
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr]    = note: consider using `_y` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/mutability.rs:14:2
[INFO] [stderr]    |
[INFO] [stderr] 14 |     y = &mut z;
[INFO] [stderr]    |     ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `x`
[INFO] [stderr]  --> src/mutability.rs:4:2
[INFO] [stderr]   |
[INFO] [stderr] 4 |     x: i32,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.07s
[INFO] running `"docker" "inspect" "700443868a007cf69e04f0d3afb91dff3ee89f28546bf396f06daf65048d8adc"`
[INFO] running `"docker" "rm" "-f" "700443868a007cf69e04f0d3afb91dff3ee89f28546bf396f06daf65048d8adc"`
[INFO] [stdout] 700443868a007cf69e04f0d3afb91dff3ee89f28546bf396f06daf65048d8adc