[INFO] fetching crate andersonpgrep 0.1.0...
[INFO] checking andersonpgrep-0.1.0 against master#c2f2db79ca3024f68d22b45aa22b570775c2c4ad for pr-124157
[INFO] extracting crate andersonpgrep 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate andersonpgrep 0.1.0 on toolchain c2f2db79ca3024f68d22b45aa22b570775c2c4ad
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate andersonpgrep 0.1.0
[INFO] finished tweaking crates.io crate andersonpgrep 0.1.0
[INFO] tweaked toml for crates.io crate andersonpgrep 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate andersonpgrep 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f5b5165dc0750a4c334506ad4eae75a548d1859154003009782bb9c1c4b7890e
[INFO] running `Command { std: "docker" "start" "-a" "f5b5165dc0750a4c334506ad4eae75a548d1859154003009782bb9c1c4b7890e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5b5165dc0750a4c334506ad4eae75a548d1859154003009782bb9c1c4b7890e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5b5165dc0750a4c334506ad4eae75a548d1859154003009782bb9c1c4b7890e", kill_on_drop: false }`
[INFO] [stdout] f5b5165dc0750a4c334506ad4eae75a548d1859154003009782bb9c1c4b7890e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d769884a6f24483f47e7930c10691089df72b095a6d3da74f992d2c7c5216312
[INFO] running `Command { std: "docker" "start" "-a" "d769884a6f24483f47e7930c10691089df72b095a6d3da74f992d2c7c5216312", kill_on_drop: false }`
[INFO] [stderr]     Checking andersonpgrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `expensive_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let expensive_closure = |num : u32| -> u32 {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_expensive_closure`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expensive_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let expensive_closure = |num : u32| -> u32 {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_expensive_closure`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let add_one_closure = |x: u32| -> u32 {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let add_one_closure = |x: u32| -> u32 {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let add_one  = |x: usize|  x + 1;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let add_one  = |x: usize|  x + 1;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_three`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let add_one_three  = |x: usize|  {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_three`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let add_one_three  = |x: usize|  {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let mut list = vec![1,2,3,4];
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let mut list = vec![1,2,3,4];
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let total: i32 = v_iter.sum(); // after this line, we are not able to use v_iter because it has
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let total: i32 = v_iter.sum(); // after this line, we are not able to use v_iter because it has
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let v2: Vec<_> = v.iter().map(|x| x + 3).collect();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let v2: Vec<_> = v.iter().map(|x| x + 3).collect();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `od_nums`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let od_nums: Vec<_> = v3.iter().filter(|x| (**x) & 1 == 1).collect();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_od_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `od_nums`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let od_nums: Vec<_> = v3.iter().filter(|x| (**x) & 1 == 1).collect();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_od_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]  --> src/closures_and_iterators/iterators.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Shoe {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]  --> src/closures_and_iterators/iterators.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Shoe {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [optimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "d769884a6f24483f47e7930c10691089df72b095a6d3da74f992d2c7c5216312", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d769884a6f24483f47e7930c10691089df72b095a6d3da74f992d2c7c5216312", kill_on_drop: false }`
[INFO] [stdout] d769884a6f24483f47e7930c10691089df72b095a6d3da74f992d2c7c5216312
[INFO] checking andersonpgrep-0.1.0 against try#9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88 for pr-124157
[INFO] extracting crate andersonpgrep 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate andersonpgrep 0.1.0 on toolchain 9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate andersonpgrep 0.1.0
[INFO] finished tweaking crates.io crate andersonpgrep 0.1.0
[INFO] tweaked toml for crates.io crate andersonpgrep 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate andersonpgrep 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cd95aab1e9a7bd1e1181339ad0858dd972dc1896ca4817178f14f82ad6e3ad45
[INFO] running `Command { std: "docker" "start" "-a" "cd95aab1e9a7bd1e1181339ad0858dd972dc1896ca4817178f14f82ad6e3ad45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd95aab1e9a7bd1e1181339ad0858dd972dc1896ca4817178f14f82ad6e3ad45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd95aab1e9a7bd1e1181339ad0858dd972dc1896ca4817178f14f82ad6e3ad45", kill_on_drop: false }`
[INFO] [stdout] cd95aab1e9a7bd1e1181339ad0858dd972dc1896ca4817178f14f82ad6e3ad45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f605c5176cbaca9ecbb7e251812f299a57faaa46c5a92c73cc6eef509825eb7f
[INFO] running `Command { std: "docker" "start" "-a" "f605c5176cbaca9ecbb7e251812f299a57faaa46c5a92c73cc6eef509825eb7f", kill_on_drop: false }`
[INFO] [stderr]     Checking andersonpgrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `expensive_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let expensive_closure = |num : u32| -> u32 {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_expensive_closure`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `expensive_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let expensive_closure = |num : u32| -> u32 {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_expensive_closure`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let add_one_closure = |x: u32| -> u32 {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_closure`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let add_one_closure = |x: u32| -> u32 {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let add_one  = |x: usize|  x + 1;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let add_one  = |x: usize|  x + 1;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_three`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let add_one_three  = |x: usize|  {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `add_one_three`
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let add_one_three  = |x: usize|  {x + 1};
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_add_one_three`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let mut list = vec![1,2,3,4];
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/closures_and_iterators/closures.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |     let mut list = vec![1,2,3,4];
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let total: i32 = v_iter.sum(); // after this line, we are not able to use v_iter because it has
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let v2: Vec<_> = v.iter().map(|x| x + 3).collect();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `od_nums`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let od_nums: Vec<_> = v3.iter().filter(|x| (**x) & 1 == 1).collect();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_od_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let total: i32 = v_iter.sum(); // after this line, we are not able to use v_iter because it has
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let v2: Vec<_> = v.iter().map(|x| x + 3).collect();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `od_nums`
[INFO] [stdout]   --> src/closures_and_iterators/iterators.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let od_nums: Vec<_> = v3.iter().filter(|x| (**x) & 1 == 1).collect();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_od_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]  --> src/closures_and_iterators/iterators.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Shoe {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]  --> src/closures_and_iterators/iterators.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Shoe {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [optimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "f605c5176cbaca9ecbb7e251812f299a57faaa46c5a92c73cc6eef509825eb7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f605c5176cbaca9ecbb7e251812f299a57faaa46c5a92c73cc6eef509825eb7f", kill_on_drop: false }`
[INFO] [stdout] f605c5176cbaca9ecbb7e251812f299a57faaa46c5a92c73cc6eef509825eb7f
