[INFO] updating cached repository https://github.com/laopo001/hello_rust
[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] 18b330e1d9a1139f12a6fa457f00924408cdd5da
[INFO] checking laopo001/hello_rust against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flaopo001%2Fhello_rust" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/laopo001/hello_rust on toolchain ea663bba38739867a4b75ac820991b4f5d093c3b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/laopo001/hello_rust
[INFO] finished tweaking git repo https://github.com/laopo001/hello_rust
[INFO] tweaked toml for git repo https://github.com/laopo001/hello_rust written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/laopo001/hello_rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2dd2cf598d58591f455d4dc024c9ffd484fb2c93c574f35e7505fdcfb5b68340
[INFO] running `"docker" "start" "-a" "2dd2cf598d58591f455d4dc024c9ffd484fb2c93c574f35e7505fdcfb5b68340"`
[INFO] [stderr]     Checking hello_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:13:17
[INFO] [stderr]    |
[INFO] [stderr] 13 | type Task = Box<FnBox + Send + 'static>;
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox + Send + 'static`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib2.rs:52:16
[INFO] [stderr]    |
[INFO] [stderr] 52 | type Job = Box<FnBox + Send + 'static>;
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox + Send + 'static`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:13:17
[INFO] [stderr]    |
[INFO] [stderr] 13 | type Task = Box<FnBox + Send + 'static>;
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox + Send + 'static`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib2.rs:52:16
[INFO] [stderr]    |
[INFO] [stderr] 52 | type Job = Box<FnBox + Send + 'static>;
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox + Send + 'static`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sender`
[INFO] [stderr]   --> src/lib.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 |         let (sender, receiver) = mpsc::channel::<Message>();
[INFO] [stderr]    |              ^^^^^^ help: consider prefixing with an underscore: `_sender`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `receiver`
[INFO] [stderr]   --> src/lib.rs:46:20
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Self {
[INFO] [stderr]    |                       ^^^^^^^^ help: consider prefixing with an underscore: `_receiver`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/lib2.rs:36:7
[INFO] [stderr]    |
[INFO] [stderr] 36 |         for i in 0..s {
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sender`
[INFO] [stderr]   --> src/lib.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 |         let (sender, receiver) = mpsc::channel::<Message>();
[INFO] [stderr]    |              ^^^^^^ help: consider prefixing with an underscore: `_sender`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `receiver`
[INFO] [stderr]   --> src/lib.rs:46:20
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Self {
[INFO] [stderr]    |                       ^^^^^^^^ help: consider prefixing with an underscore: `_receiver`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/lib2.rs:36:7
[INFO] [stderr]    |
[INFO] [stderr] 36 |         for i in 0..s {
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `NewJob`
[INFO] [stderr]   --> src/lib.rs:16:2
[INFO] [stderr]    |
[INFO] [stderr] 16 |     NewJob(Task),
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Terminate`
[INFO] [stderr]   --> src/lib.rs:17:2
[INFO] [stderr]    |
[INFO] [stderr] 17 |     Terminate,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `size`
[INFO] [stderr]   --> src/lib.rs:22:2
[INFO] [stderr]    |
[INFO] [stderr] 22 |     size: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `workers`
[INFO] [stderr]   --> src/lib.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     workers: Vec<Worker>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `id`
[INFO] [stderr]   --> src/lib.rs:42:2
[INFO] [stderr]    |
[INFO] [stderr] 42 |     id: usize,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `id`
[INFO] [stderr]   --> src/lib2.rs:55:2
[INFO] [stderr]    |
[INFO] [stderr] 55 |     id: usize,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `NewJob`
[INFO] [stderr]   --> src/lib.rs:16:2
[INFO] [stderr]    |
[INFO] [stderr] 16 |     NewJob(Task),
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Terminate`
[INFO] [stderr]   --> src/lib.rs:17:2
[INFO] [stderr]    |
[INFO] [stderr] 17 |     Terminate,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `size`
[INFO] [stderr]   --> src/lib.rs:22:2
[INFO] [stderr]    |
[INFO] [stderr] 22 |     size: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `workers`
[INFO] [stderr]   --> src/lib.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     workers: Vec<Worker>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `id`
[INFO] [stderr]   --> src/lib.rs:42:2
[INFO] [stderr]    |
[INFO] [stderr] 42 |     id: usize,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `id`
[INFO] [stderr]   --> src/lib2.rs:55:2
[INFO] [stderr]    |
[INFO] [stderr] 55 |     id: usize,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/lib2.rs:68:6
[INFO] [stderr]    |
[INFO] [stderr] 68 |                     sender.lock().unwrap().send(());
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/lib2.rs:68:6
[INFO] [stderr]    |
[INFO] [stderr] 68 |                     sender.lock().unwrap().send(());
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::marker::PhantomPinned`
[INFO] [stderr]  --> src/bin/pin.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::marker::PhantomPinned;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc`, `Mutex`
[INFO] [stderr]  --> src/bin/main3.rs:2:17
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::{Arc, mpsc, Mutex};
[INFO] [stderr]   |                 ^^^        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/bin/main4.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `mpsc`
[INFO] [stderr]  --> src/bin/thread.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::sync::{mpsc, Arc, Mutex};
[INFO] [stderr]   |                 ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc`, `Mutex`
[INFO] [stderr]  --> src/bin/main3.rs:2:17
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::{Arc, mpsc, Mutex};
[INFO] [stderr]   |                 ^^^        ^^^^^
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/bin/main4.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/pin.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut a = Person {
[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/bin/pin.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let mut b = Person {
[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/bin/pin.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |     let mut pin_box_d = Box::pin(d);
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `receiver`
[INFO] [stderr]  --> src/bin/main4.rs:8:10
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let (s, receiver) = mpsc::channel::<String>();
[INFO] [stderr]   |             ^^^^^^^^ help: consider prefixing with an underscore: `_receiver`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sender`
[INFO] [stderr]   --> src/bin/main4.rs:10:6
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let sender = s.clone();
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_sender`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/main4.rs:16:7
[INFO] [stderr]    |
[INFO] [stderr] 16 |         let mut c_v = Arc::clone(&vec);
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/thread.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let mut data = j.lock().unwrap();
[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: `mpsc`
[INFO] [stderr]  --> src/bin/thread.rs:1:17
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::sync::{mpsc, Arc, Mutex};
[INFO] [stderr]   |                 ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `receiver`
[INFO] [stderr]  --> src/bin/main4.rs:8:10
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let (s, receiver) = mpsc::channel::<String>();
[INFO] [stderr]   |             ^^^^^^^^ help: consider prefixing with an underscore: `_receiver`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sender`
[INFO] [stderr]   --> src/bin/main4.rs:10:6
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let sender = s.clone();
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_sender`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/thread.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         child.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/main4.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 |             sender.send(i.to_string());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/main4.rs:16:7
[INFO] [stderr]    |
[INFO] [stderr] 16 |         let mut c_v = Arc::clone(&vec);
[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: `a`
[INFO] [stderr]   --> src/bin/wasm.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let a = 123;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/main4.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 |             sender.send(i.to_string());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/bin/wasm.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let a = 123;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::marker::PhantomPinned`
[INFO] [stderr]  --> src/bin/pin.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::marker::PhantomPinned;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/thread.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let mut data = j.lock().unwrap();
[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 `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/thread.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         child.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/pin.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut a = Person {
[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/bin/pin.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let mut b = Person {
[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/bin/pin.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |     let mut pin_box_d = Box::pin(d);
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.01s
[INFO] running `"docker" "inspect" "2dd2cf598d58591f455d4dc024c9ffd484fb2c93c574f35e7505fdcfb5b68340"`
[INFO] running `"docker" "rm" "-f" "2dd2cf598d58591f455d4dc024c9ffd484fb2c93c574f35e7505fdcfb5b68340"`
[INFO] [stdout] 2dd2cf598d58591f455d4dc024c9ffd484fb2c93c574f35e7505fdcfb5b68340