[INFO] cloning repository https://github.com/Nov11/rust-pl
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nov11/rust-pl" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0a7cf494b601889c42daf4e23e78245e01117607
[INFO] testing Nov11/rust-pl against 1.75.0 for beta-1.76-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Nov11/rust-pl on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Nov11/rust-pl
[INFO] finished tweaking git repo https://github.com/Nov11/rust-pl
[INFO] tweaked toml for git repo https://github.com/Nov11/rust-pl written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Nov11/rust-pl 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c20cd0311c43f7c0b8ae3110159b1778bfad2968887b951006d8f87a846f49db
[INFO] running `Command { std: "docker" "start" "-a" "c20cd0311c43f7c0b8ae3110159b1778bfad2968887b951006d8f87a846f49db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c20cd0311c43f7c0b8ae3110159b1778bfad2968887b951006d8f87a846f49db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c20cd0311c43f7c0b8ae3110159b1778bfad2968887b951006d8f87a846f49db", kill_on_drop: false }`
[INFO] [stdout] c20cd0311c43f7c0b8ae3110159b1778bfad2968887b951006d8f87a846f49db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9752d34a364e65e6ac2dee157f1ce0f550bf4c7ecdf0cbd0037398bd34d639a6
[INFO] running `Command { std: "docker" "start" "-a" "9752d34a364e65e6ac2dee157f1ce0f550bf4c7ecdf0cbd0037398bd34d639a6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling semver-parser v0.7.0
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[INFO] [stderr]    Compiling traitobject v0.1.0
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[INFO] [stderr]    Compiling version_check v0.1.5
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[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling unicode-normalization v0.1.8
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling num_cpus v1.10.1
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[INFO] [stderr]    Compiling num-traits v0.1.43
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[INFO] [stderr]    Compiling conduit-mime-types v0.7.3
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[INFO] [stderr]    Compiling url v1.7.2
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[INFO] [stderr]    Compiling modifier v0.1.0
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[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling adler32 v1.0.4
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling deflate v0.7.20
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling rayon v1.2.0
[INFO] [stderr]    Compiling num-rational v0.1.42
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[INFO] [stderr]    Compiling bitflags v0.7.0
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[INFO] [stderr]    Compiling lzw v0.10.0
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling route-recognizer v0.1.13
[INFO] [stderr]    Compiling scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling add_one v0.1.0 (/opt/rustwide/workdir/add_one)
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling jpeg-decoder v0.1.16
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]    Compiling iron v0.5.1
[INFO] [stderr]    Compiling state-pattern v0.1.0 (/opt/rustwide/workdir/state-pattern)
[INFO] [stderr]    Compiling crossbeam v0.2.12
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> state-pattern/src/lib.rs:38:27
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ch20 v0.1.0 (/opt/rustwide/workdir/ch20)
[INFO] [stderr]    Compiling persistent v0.3.0
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling png v0.7.0
[INFO] [stderr]    Compiling router v0.5.1
[INFO] [stderr]    Compiling image v0.13.0
[INFO] [stderr]    Compiling bodyparser v0.5.0
[INFO] [stderr]    Compiling adder v0.1.0 (/opt/rustwide/workdir/adder)
[INFO] [stderr]    Compiling rust-programming-language v0.1.0 (/opt/rustwide/workdir/ch01)
[INFO] [stderr]    Compiling urlencoded v0.5.0
[INFO] [stderr]    Compiling guess-game v0.1.0 (/opt/rustwide/workdir/guess-game)
[INFO] [stderr]    Compiling ref-scope v0.1.0 (/opt/rustwide/workdir/ref-scope)
[INFO] [stderr]    Compiling modules v0.1.0 (/opt/rustwide/workdir/modules)
[INFO] [stderr]    Compiling ch19 v0.1.0 (/opt/rustwide/workdir/ch19)
[INFO] [stdout] warning: unused variable: `rhs`
[INFO] [stdout]   --> ch19/src/main.rs:18:18
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add(self, rhs: Self) -> Self::Output {
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_rhs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_fn` is never used
[INFO] [stdout]   --> ch19/src/main.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn return_fn() -> Box<dyn Fn(i32) -> i32>{
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling cmd v0.1.0 (/opt/rustwide/workdir/cmd)
[INFO] [stderr]    Compiling box-usage v0.1.0 (/opt/rustwide/workdir/box-usage)
[INFO] [stderr]    Compiling closures v0.1.0 (/opt/rustwide/workdir/closures)
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]  --> box-usage/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let list = List::Cons(1, Box::new(List::Nil));
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]  --> closures/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let v2 = vec;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> closures/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut vec = vec![1, 2, 3];
[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: `plus_magic`
[INFO] [stdout]   --> closures/src/main.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let plus_magic = |x: i32| x + magic_num;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_plus_magic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `more_magic`
[INFO] [stdout]   --> closures/src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let more_magic = &mut magic_num; // Err!
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_more_magic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `number` is never read
[INFO] [stdout]   --> closures/src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Label {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 13 |     number: i32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Label` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `default_ref` is never used
[INFO] [stdout]   --> closures/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn default_ref() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `default_move` is never used
[INFO] [stdout]   --> closures/src/main.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn default_move() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement drops value
[INFO] [stdout]   --> closures/src/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         numbers;
[INFO] [stdout]    |         ^^^^^^^^ help: use `drop` to clarify the intent: `drop(numbers);`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling add_two v0.1.0 (/opt/rustwide/workdir/add_two)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling simple-web-server v0.1.0 (/opt/rustwide/workdir/simple-web-server)
[INFO] [stderr]    Compiling concurrency v0.1.0 (/opt/rustwide/workdir/concurrency)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.24s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24, traitobject v0.1.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "9752d34a364e65e6ac2dee157f1ce0f550bf4c7ecdf0cbd0037398bd34d639a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9752d34a364e65e6ac2dee157f1ce0f550bf4c7ecdf0cbd0037398bd34d639a6", kill_on_drop: false }`
[INFO] [stdout] 9752d34a364e65e6ac2dee157f1ce0f550bf4c7ecdf0cbd0037398bd34d639a6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6c8c302373482e954704f69e5e82deebbffdf5546ab44b625fd5a37ea1b782e
[INFO] running `Command { std: "docker" "start" "-a" "a6c8c302373482e954704f69e5e82deebbffdf5546ab44b625fd5a37ea1b782e", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> state-pattern/src/lib.rs:38:27
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling concurrency v0.1.0 (/opt/rustwide/workdir/concurrency)
[INFO] [stderr]    Compiling rust-programming-language v0.1.0 (/opt/rustwide/workdir/ch01)
[INFO] [stderr]    Compiling simple-web-server v0.1.0 (/opt/rustwide/workdir/simple-web-server)
[INFO] [stderr]    Compiling state-pattern v0.1.0 (/opt/rustwide/workdir/state-pattern)
[INFO] [stderr]    Compiling ch20 v0.1.0 (/opt/rustwide/workdir/ch20)
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]    Compiling adder v0.1.0 (/opt/rustwide/workdir/adder)
[INFO] [stderr]    Compiling guess-game v0.1.0 (/opt/rustwide/workdir/guess-game)
[INFO] [stderr]    Compiling add_one v0.1.0 (/opt/rustwide/workdir/add_one)
[INFO] [stderr]    Compiling modules v0.1.0 (/opt/rustwide/workdir/modules)
[INFO] [stderr]    Compiling box-usage v0.1.0 (/opt/rustwide/workdir/box-usage)
[INFO] [stderr]    Compiling cmd v0.1.0 (/opt/rustwide/workdir/cmd)
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]  --> box-usage/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let list = List::Cons(1, Box::new(List::Nil));
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ref-scope v0.1.0 (/opt/rustwide/workdir/ref-scope)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> state-pattern/src/lib.rs:38:27
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling closures v0.1.0 (/opt/rustwide/workdir/closures)
[INFO] [stderr]    Compiling ch19 v0.1.0 (/opt/rustwide/workdir/ch19)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]  --> closures/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let v2 = vec;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling add_two v0.1.0 (/opt/rustwide/workdir/add_two)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> closures/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut vec = vec![1, 2, 3];
[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: `plus_magic`
[INFO] [stdout]   --> closures/src/main.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let plus_magic = |x: i32| x + magic_num;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_plus_magic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `more_magic`
[INFO] [stdout]   --> closures/src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let more_magic = &mut magic_num; // Err!
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_more_magic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `number` is never read
[INFO] [stdout]   --> closures/src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Label {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 13 |     number: i32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Label` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `default_ref` is never used
[INFO] [stdout]   --> closures/src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn default_ref() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `default_move` is never used
[INFO] [stdout]   --> closures/src/main.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn default_move() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement drops value
[INFO] [stdout]   --> closures/src/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         numbers;
[INFO] [stdout]    |         ^^^^^^^^ help: use `drop` to clarify the intent: `drop(numbers);`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rhs`
[INFO] [stdout]   --> ch19/src/main.rs:18:18
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn add(self, rhs: Self) -> Self::Output {
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_rhs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_fn` is never used
[INFO] [stdout]   --> ch19/src/main.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn return_fn() -> Box<dyn Fn(i32) -> i32>{
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 4.83s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24, traitobject v0.1.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "a6c8c302373482e954704f69e5e82deebbffdf5546ab44b625fd5a37ea1b782e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6c8c302373482e954704f69e5e82deebbffdf5546ab44b625fd5a37ea1b782e", kill_on_drop: false }`
[INFO] [stdout] a6c8c302373482e954704f69e5e82deebbffdf5546ab44b625fd5a37ea1b782e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f1462538e40bb2891e379fe95534aca5f2f60b32fee5d685b17a6aec056b8f7a
[INFO] running `Command { std: "docker" "start" "-a" "f1462538e40bb2891e379fe95534aca5f2f60b32fee5d685b17a6aec056b8f7a", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `post`
[INFO] [stderr]   --> state-pattern/src/lib.rs:38:27
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stderr]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `state-pattern` (lib) generated 1 warning (run `cargo fix --lib -p state-pattern` to apply 1 suggestion)
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]  --> box-usage/src/main.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let list = List::Cons(1, Box::new(List::Nil));
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `box-usage` (bin "box-usage" test) generated 1 warning (run `cargo fix --bin "box-usage" --tests` to apply 1 suggestion)
[INFO] [stderr] warning: unused variable: `rhs`
[INFO] [stderr]   --> ch19/src/main.rs:18:18
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn add(self, rhs: Self) -> Self::Output {
[INFO] [stderr]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_rhs`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `return_fn` is never used
[INFO] [stderr]   --> ch19/src/main.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn return_fn() -> Box<dyn Fn(i32) -> i32>{
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v2`
[INFO] [stderr]  --> closures/src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let v2 = vec;
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> closures/src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut vec = vec![1, 2, 3];
[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: `plus_magic`
[INFO] [stderr]   --> closures/src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let plus_magic = |x: i32| x + magic_num;
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_plus_magic`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `more_magic`
[INFO] [stderr]   --> closures/src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let more_magic = &mut magic_num; // Err!
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_more_magic`
[INFO] [stderr] 
[INFO] [stderr] warning: field `number` is never read
[INFO] [stderr]   --> closures/src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | struct Label {
[INFO] [stderr]    |        ----- field in this struct
[INFO] [stderr] 13 |     number: i32,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Label` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `default_ref` is never used
[INFO] [stderr]   --> closures/src/main.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn default_ref() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `default_move` is never used
[INFO] [stderr]   --> closures/src/main.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn default_move() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: path statement drops value
[INFO] [stderr]   --> closures/src/main.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |         numbers;
[INFO] [stderr]    |         ^^^^^^^^ help: use `drop` to clarify the intent: `drop(numbers);`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(path_statements)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `ch19` (bin "ch19" test) generated 2 warnings (run `cargo fix --bin "ch19" --tests` to apply 1 suggestion)
[INFO] [stderr] warning: `closures` (bin "closures" test) generated 8 warnings (run `cargo fix --bin "closures" --tests` to apply 5 suggestions)
[INFO] [stderr] warning: `state-pattern` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24, traitobject v0.1.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/add_one-cee4893ca021ddf4)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/add_two-42a76647c9dc2697)
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/adder-4fe0e630a90ab6e6)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/box_usage-4b10ff65e65c9bfd)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/ch19-c1e1c0b4bc7291ce)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/ch20-3629c1aa5971d6ae)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/main.rs (/opt/rustwide/target/debug/deps/main-756fa7a2e794ae3e)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/closures-a4d8687f84ac41c6)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/cmd-55aebe8bbeafe3c3)
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/concurrency-04c7ec0d9b04908f)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/guess_game-d27297a7bfb39de9)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/minigrep-0e93ddc4d125ce13)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::one_result ... ok
[INFO] [stdout] test tests::case_insensitive ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/minigrep-c6bfa95aadb96259)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/modules-9fd79c3eacd741bb)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/ref_scope-e5b8f30ae77ee83b)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_programming_language-92e1dad6f74eda5a)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/simple_web_server-fb1839884dcce6fa)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/state_pattern-e2e3556e68f36d38)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/state_pattern-fb75db50601d30c4)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests add_one
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests add_two
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests ch20
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests minigrep
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests state-pattern
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f1462538e40bb2891e379fe95534aca5f2f60b32fee5d685b17a6aec056b8f7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1462538e40bb2891e379fe95534aca5f2f60b32fee5d685b17a6aec056b8f7a", kill_on_drop: false }`
[INFO] [stdout] f1462538e40bb2891e379fe95534aca5f2f60b32fee5d685b17a6aec056b8f7a
