[INFO] updating cached repository yagince/programming-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/yagince/programming-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/yagince/programming-rust" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/yagince/programming-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/yagince/programming-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/yagince/programming-rust" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/yagince/programming-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/yagince/programming-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2fb11ea3e31e1d7584b541293cb56108d4b4ac0f
[INFO] sha for GitHub repo yagince/programming-rust: 2fb11ea3e31e1d7584b541293cb56108d4b4ac0f
[INFO] validating manifest of yagince/programming-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 yagince/programming-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 yagince/programming-rust
[INFO] finished frobbing yagince/programming-rust
[INFO] frobbed toml for yagince/programming-rust written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/yagince/programming-rust/Cargo.toml
[INFO] started frobbing yagince/programming-rust
[INFO] finished frobbing yagince/programming-rust
[INFO] frobbed toml for yagince/programming-rust written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/yagince/programming-rust/Cargo.toml
[INFO] crate yagince/programming-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 yagince/programming-rust against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-5/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/yagince/programming-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] 3122b645b86a92ee8fd3e36af5a625496b6787cc98d90673b2e92101ab806120
[INFO] running `"docker" "start" "-a" "3122b645b86a92ee8fd3e36af5a625496b6787cc98d90673b2e92101ab806120"`
[INFO] [stderr]     Checking samples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]  --> src/bin/4_4_rc_arc.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let t = s.clone(); // cloneすると参照カウントがインクリメントされるが実際はコピーされない
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_t`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/bin/4_4_rc_arc.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let u = s.clone();
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/bin/4_4_rc_arc.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut s = Rc::new("hoge".to_string());
[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: unused import: `std::io::Result`
[INFO] [stderr]  --> src/bin/6_4_1_if_let.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::Result;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `y`
[INFO] [stderr]  --> src/bin/5_2_6_lifetime_parameter.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     y: &'b i32,
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a_2`
[INFO] [stderr]  --> src/bin/4_3_copy.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let a_2 = a;
[INFO] [stderr]   |         ^^^ help: consider prefixing with an underscore: `_a_2`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Result`
[INFO] [stderr]  --> src/bin/6_4_1_if_let.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::Result;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a_2`
[INFO] [stderr]  --> src/bin/4_3_copy.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let a_2 = a;
[INFO] [stderr]   |         ^^^ help: consider prefixing with an underscore: `_a_2`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `aside`
[INFO] [stderr]   --> src/bin/5_3_share_refenrence.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let aside = v;
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_aside`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/bin/5_3_share_refenrence.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let r1 = &mut r.1; // 可変参照から可変参照の再借用は出来る
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]  --> src/bin/4_4_rc_arc.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let t = s.clone(); // cloneすると参照カウントがインクリメントされるが実際はコピーされない
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_t`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/bin/4_4_rc_arc.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let u = s.clone();
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/bin/4_4_rc_arc.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut s = Rc::new("hoge".to_string());
[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: unused variable: `aside`
[INFO] [stderr]   --> src/bin/5_3_share_refenrence.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let aside = v;
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_aside`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/bin/5_3_share_refenrence.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let r1 = &mut r.1; // 可変参照から可変参照の再借用は出来る
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `y`
[INFO] [stderr]  --> src/bin/5_2_6_lifetime_parameter.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     y: &'b 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 1.98s
[INFO] running `"docker" "inspect" "3122b645b86a92ee8fd3e36af5a625496b6787cc98d90673b2e92101ab806120"`
[INFO] running `"docker" "rm" "-f" "3122b645b86a92ee8fd3e36af5a625496b6787cc98d90673b2e92101ab806120"`
[INFO] [stdout] 3122b645b86a92ee8fd3e36af5a625496b6787cc98d90673b2e92101ab806120