[INFO] cloning repository YoshikuniJujo/learn_rust
[INFO] running `"git" "clone" "--bare" "git://github.com/YoshikuniJujo/learn_rust.git" "work/cache/sources/gh/YoshikuniJujo/learn_rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/YoshikuniJujo/learn_rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/YoshikuniJujo/learn_rust" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/YoshikuniJujo/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/YoshikuniJujo/learn_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/YoshikuniJujo/learn_rust" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/YoshikuniJujo/learn_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/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#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of YoshikuniJujo/learn_rust on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-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-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/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-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/YoshikuniJujo/learn_rust/Cargo.toml
[INFO] crate YoshikuniJujo/learn_rust has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking YoshikuniJujo/learn_rust against master#c0086b9e8972fef9fd4af24bae20d45021ed06c6 for pr-58899
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58899/worker-3/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/YoshikuniJujo/learn_rust:/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=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" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 0c649f5a361166c7d66a8ecfd8826576fa9afcda0991f3805d9363fc84718914
[INFO] running `"docker" "start" "-a" "0c649f5a361166c7d66a8ecfd8826576fa9afcda0991f3805d9363fc84718914"`
[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: 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: 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] 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: 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]     Finished dev [unoptimized + debuginfo] target(s) in 4.07s
[INFO] running `"docker" "inspect" "0c649f5a361166c7d66a8ecfd8826576fa9afcda0991f3805d9363fc84718914"`
[INFO] running `"docker" "rm" "-f" "0c649f5a361166c7d66a8ecfd8826576fa9afcda0991f3805d9363fc84718914"`
[INFO] [stdout] 0c649f5a361166c7d66a8ecfd8826576fa9afcda0991f3805d9363fc84718914