[INFO] cloning repository https://github.com/nickx720/iteratorsrust_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nickx720/iteratorsrust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickx720%2Fiteratorsrust_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickx720%2Fiteratorsrust_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bb14a7ca1c8d651d8861239bb2ca420f0de338cf
[INFO] checking nickx720/iteratorsrust_playground against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickx720%2Fiteratorsrust_playground" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nickx720/iteratorsrust_playground on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nickx720/iteratorsrust_playground
[INFO] finished tweaking git repo https://github.com/nickx720/iteratorsrust_playground
[INFO] tweaked toml for git repo https://github.com/nickx720/iteratorsrust_playground written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/nickx720/iteratorsrust_playground 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 34863949145bf24cbcd390ef4762647500e29927aaa31361daf8f1b30d7e9f94
[INFO] running `Command { std: "docker" "start" "-a" "34863949145bf24cbcd390ef4762647500e29927aaa31361daf8f1b30d7e9f94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "34863949145bf24cbcd390ef4762647500e29927aaa31361daf8f1b30d7e9f94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34863949145bf24cbcd390ef4762647500e29927aaa31361daf8f1b30d7e9f94", kill_on_drop: false }`
[INFO] [stdout] 34863949145bf24cbcd390ef4762647500e29927aaa31361daf8f1b30d7e9f94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99ae61808fdcd1b4d2ba4ecdf58e165bb68c3e49190c3d067e8a8d91d17b33ee
[INFO] running `Command { std: "docker" "start" "-a" "99ae61808fdcd1b4d2ba4ecdf58e165bb68c3e49190c3d067e8a8d91d17b33ee", kill_on_drop: false }`
[INFO] [stderr]     Checking iterators v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `Test_P` should have an upper camel case name
[INFO] [stdout]   --> src/self-referential/main.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Test_P {
[INFO] [stdout]    |        ^^^^^^ help: convert the identifier to upper camel case: `TestP`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Test_P` should have an upper camel case name
[INFO] [stdout]   --> src/self-referential/main.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Test_P {
[INFO] [stdout]    |        ^^^^^^ help: convert the identifier to upper camel case: `TestP`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Leaf` and `Children` are never constructed
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Node<Item> {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 5 |     Leaf(Item),
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Children(Vec<Node<Item>>),
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `traverse` is never used
[INFO] [stdout]  --> src/main.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl<It> Node<It> {
[INFO] [stdout]   | ----------------- method in this implementation
[INFO] [stdout] 9 |     fn traverse(&self, f: impl Fn(&It)) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/self-referential/main.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let a = Me::new(Rc::clone(&holder), "a");
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/self-referential/main.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let b = Me::new(Rc::clone(&holder), "b");
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> src/self-referential/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Me {
[INFO] [stdout]    |        -- field in this struct
[INFO] [stdout] 26 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Me` has a derived impl for the trait `Debug`, 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: struct `Test_P` is never constructed
[INFO] [stdout]   --> src/self-referential/main.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Test_P {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/self-referential/main.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 99  | impl Test_P {
[INFO] [stdout]     | ----------- associated function in this implementation
[INFO] [stdout] 100 |     fn new(txt: &str) -> Pin<Box<Self>> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:249:9
[INFO] [stdout]     |
[INFO] [stdout] 249 |     let mut tree = Node::Children(vec![
[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: method `traverse` is never used
[INFO] [stdout]  --> src/main.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl<It> Node<It> {
[INFO] [stdout]   | ----------------- method in this implementation
[INFO] [stdout] 9 |     fn traverse(&self, f: impl Fn(&It)) {
[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] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/self-referential/main.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     let a = Me::new(Rc::clone(&holder), "a");
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/self-referential/main.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |     let b = Me::new(Rc::clone(&holder), "b");
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> src/self-referential/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Me {
[INFO] [stdout]    |        -- field in this struct
[INFO] [stdout] 26 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Me` has a derived impl for the trait `Debug`, 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: struct `Test_P` is never constructed
[INFO] [stdout]   --> src/self-referential/main.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Test_P {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/self-referential/main.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 99  | impl Test_P {
[INFO] [stdout]     | ----------- associated function in this implementation
[INFO] [stdout] 100 |     fn new(txt: &str) -> Pin<Box<Self>> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "99ae61808fdcd1b4d2ba4ecdf58e165bb68c3e49190c3d067e8a8d91d17b33ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99ae61808fdcd1b4d2ba4ecdf58e165bb68c3e49190c3d067e8a8d91d17b33ee", kill_on_drop: false }`
[INFO] [stdout] 99ae61808fdcd1b4d2ba4ecdf58e165bb68c3e49190c3d067e8a8d91d17b33ee