[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] checking Nov11/rust-pl against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Nov11/rust-pl on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "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-5/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: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a41b740614819aa01054f263377f1f72a6d79056fb3c233f1f977837f6f6e710
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a41b740614819aa01054f263377f1f72a6d79056fb3c233f1f977837f6f6e710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a41b740614819aa01054f263377f1f72a6d79056fb3c233f1f977837f6f6e710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a41b740614819aa01054f263377f1f72a6d79056fb3c233f1f977837f6f6e710", kill_on_drop: false }`
[INFO] [stdout] a41b740614819aa01054f263377f1f72a6d79056fb3c233f1f977837f6f6e710
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c53ab89120228b77e4f79a757e8ccb088859cf5fe627b4f4214e7c10cd2ab15
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3c53ab89120228b77e4f79a757e8ccb088859cf5fe627b4f4214e7c10cd2ab15", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking traitobject v0.1.0
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking typeable v0.1.2
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]     Checking modifier v0.1.0
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]     Checking ch20 v0.1.0 (/opt/rustwide/workdir/ch20)
[INFO] [stderr]     Checking state-pattern v0.1.0 (/opt/rustwide/workdir/state-pattern)
[INFO] [stderr]     Checking box-usage v0.1.0 (/opt/rustwide/workdir/box-usage)
[INFO] [stderr]     Checking closures v0.1.0 (/opt/rustwide/workdir/closures)
[INFO] [stderr]     Checking add_two v0.1.0 (/opt/rustwide/workdir/add_two)
[INFO] [stderr]     Checking modules v0.1.0 (/opt/rustwide/workdir/modules)
[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]     Checking ch19 v0.1.0 (/opt/rustwide/workdir/ch19)
[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]     Checking ref-scope v0.1.0 (/opt/rustwide/workdir/ref-scope)
[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: 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: 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: field is never read: `number`
[INFO] [stdout]   --> closures/src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `default_ref`
[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 is never used: `default_move`
[INFO] [stdout]   --> closures/src/main.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn default_move() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking cmd v0.1.0 (/opt/rustwide/workdir/cmd)
[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: `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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[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] [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: 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: field is never read: `number`
[INFO] [stdout]   --> closures/src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     number: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `default_ref`
[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 is never used: `default_move`
[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: 8 warnings emitted
[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 is never used: `return_fn`
[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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking conduit-mime-types v0.7.3
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking unsafe-any v0.4.2
[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] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stdout] warning: function is never used: `return_fn`
[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: 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]     Checking error v0.1.9
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking deflate v0.7.20
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking typemap v0.3.3
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking plugin v0.2.6
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking rayon-core v1.6.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking serde_json v0.8.6
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking rust-programming-language v0.1.0 (/opt/rustwide/workdir/ch01)
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]     Checking rayon v1.2.0
[INFO] [stderr]     Checking add_one v0.1.0 (/opt/rustwide/workdir/add_one)
[INFO] [stderr]     Checking guess-game v0.1.0 (/opt/rustwide/workdir/guess-game)
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking adder v0.1.0 (/opt/rustwide/workdir/adder)
[INFO] [stderr]     Checking png v0.7.0
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking jpeg-decoder v0.1.16
[INFO] [stderr]     Checking iron v0.5.1
[INFO] [stderr]     Checking persistent v0.3.0
[INFO] [stderr]     Checking router v0.5.1
[INFO] [stderr]     Checking image v0.13.0
[INFO] [stderr]     Checking bodyparser v0.5.0
[INFO] [stderr]     Checking urlencoded v0.5.0
[INFO] [stderr]     Checking simple-web-server v0.1.0 (/opt/rustwide/workdir/simple-web-server)
[INFO] [stderr]     Checking concurrency v0.1.0 (/opt/rustwide/workdir/concurrency)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.92s
[INFO] running `Command { std: "docker" "inspect" "3c53ab89120228b77e4f79a757e8ccb088859cf5fe627b4f4214e7c10cd2ab15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c53ab89120228b77e4f79a757e8ccb088859cf5fe627b4f4214e7c10cd2ab15", kill_on_drop: false }`
[INFO] [stdout] 3c53ab89120228b77e4f79a757e8ccb088859cf5fe627b4f4214e7c10cd2ab15