[INFO] cloning repository https://github.com/init-center/rust_learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/init-center/rust_learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finit-center%2Frust_learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finit-center%2Frust_learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 718104de877363ca20dd09b77ab21d73955faef8
[INFO] checking init-center/rust_learn against master#b44e14f762fd4062faeba97f8f2bc470298ec1ac for pr-135331
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finit-center%2Frust_learn" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/init-center/rust_learn on toolchain b44e14f762fd4062faeba97f8f2bc470298ec1ac
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b44e14f762fd4062faeba97f8f2bc470298ec1ac" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/init-center/rust_learn
[INFO] finished tweaking git repo https://github.com/init-center/rust_learn
[INFO] tweaked toml for git repo https://github.com/init-center/rust_learn written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/init-center/rust_learn 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" "+b44e14f762fd4062faeba97f8f2bc470298ec1ac" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+b44e14f762fd4062faeba97f8f2bc470298ec1ac" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ffeb21eac1c232c5bc75f81448c60cef546b74f33b98749e43fd6c937e955e1c
[INFO] running `Command { std: "docker" "start" "-a" "ffeb21eac1c232c5bc75f81448c60cef546b74f33b98749e43fd6c937e955e1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffeb21eac1c232c5bc75f81448c60cef546b74f33b98749e43fd6c937e955e1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffeb21eac1c232c5bc75f81448c60cef546b74f33b98749e43fd6c937e955e1c", kill_on_drop: false }`
[INFO] [stdout] ffeb21eac1c232c5bc75f81448c60cef546b74f33b98749e43fd6c937e955e1c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+b44e14f762fd4062faeba97f8f2bc470298ec1ac" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2973bcd490aa792a125792874fa272ded85f1bd7c6ceec4cbb121cec223db6bc
[INFO] running `Command { std: "docker" "start" "-a" "2973bcd490aa792a125792874fa272ded85f1bd7c6ceec4cbb121cec223db6bc", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]    --> src/main.rs:676:9
[INFO] [stdout]     |
[INFO] [stdout] 676 |     let six = plus_one(five);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]    --> src/main.rs:677:9
[INFO] [stdout]     |
[INFO] [stdout] 677 |     let none = plus_one(None);
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hm`
[INFO] [stdout]    --> src/main.rs:806:13
[INFO] [stdout]     |
[INFO] [stdout] 806 |     let mut hm: HashMap<String, i32> = HashMap::new();
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_hm`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]    --> src/main.rs:676:9
[INFO] [stdout]     |
[INFO] [stdout] 676 |     let six = plus_one(five);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]    --> src/main.rs:677:9
[INFO] [stdout]     |
[INFO] [stdout] 677 |     let none = plus_one(None);
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hm`
[INFO] [stdout]    --> src/main.rs:806:13
[INFO] [stdout]     |
[INFO] [stdout] 806 |     let mut hm: HashMap<String, i32> = HashMap::new();
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_hm`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:806:9
[INFO] [stdout]     |
[INFO] [stdout] 806 |     let mut hm: HashMap<String, i32> = HashMap::new();
[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/main.rs:806:9
[INFO] [stdout]     |
[INFO] [stdout] 806 |     let mut hm: HashMap<String, i32> = HashMap::new();
[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: fields `toast` and `seasonal_fruit` are never read
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 885 |     pub struct Breakfast {
[INFO] [stdout]     |                --------- fields in this struct
[INFO] [stdout] 886 |         pub toast: String,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 887 |         seasonal_fruit: String,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Appetizer` is never used
[INFO] [stdout]    --> src/main.rs:892:14
[INFO] [stdout]     |
[INFO] [stdout] 892 |     pub enum Appetizer {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]    --> src/main.rs:479:22
[INFO] [stdout]     |
[INFO] [stdout] 479 |         struct Color(i32, i32, i32);
[INFO] [stdout]     |                ----- ^^^  ^^^  ^^^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                fields in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing these fields
[INFO] [stdout]     = note: `Color` 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: fields `0`, `1`, and `2` are never read
[INFO] [stdout]    --> src/main.rs:481:22
[INFO] [stdout]     |
[INFO] [stdout] 481 |         struct Point(i32, i32, i32);
[INFO] [stdout]     |                ----- ^^^  ^^^  ^^^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                fields in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing these fields
[INFO] [stdout]     = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]    --> src/main.rs:551:13
[INFO] [stdout]     |
[INFO] [stdout] 550 |         struct Rectangle {
[INFO] [stdout]     |                --------- fields in this struct
[INFO] [stdout] 551 |             width: u32,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 552 |             height: u32,
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:591:12
[INFO] [stdout]     |
[INFO] [stdout] 591 |         V4(String),
[INFO] [stdout]     |         -- ^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 591 |         V4(()),
[INFO] [stdout]     |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:592:12
[INFO] [stdout]     |
[INFO] [stdout] 592 |         V6(String),
[INFO] [stdout]     |         -- ^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 592 |         V6(()),
[INFO] [stdout]     |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/main.rs:603:15
[INFO] [stdout]     |
[INFO] [stdout] 603 |         Write(String),
[INFO] [stdout]     |         ----- ^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         field in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 603 |         Write(()),
[INFO] [stdout]     |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Move`, and `ChangeColor` are never constructed
[INFO] [stdout]    --> src/main.rs:601:9
[INFO] [stdout]     |
[INFO] [stdout] 600 |     enum Message {
[INFO] [stdout]     |          ------- variants in this enum
[INFO] [stdout] 601 |         Quit,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 602 |         Move { x: i32, y: i32 },
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 603 |         Write(String),
[INFO] [stdout] 604 |         ChangeColor(i32, i32, i32),
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alabama` is never constructed
[INFO] [stdout]    --> src/main.rs:636:9
[INFO] [stdout]     |
[INFO] [stdout] 635 |     enum UsState {
[INFO] [stdout]     |          ------- variant in this enum
[INFO] [stdout] 636 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/main.rs:642:9
[INFO] [stdout]     |
[INFO] [stdout] 641 |     enum Coin {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 642 |         Penny,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 643 |         Nickel,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 644 |         Dime,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `toast` and `seasonal_fruit` are never read
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 885 |     pub struct Breakfast {
[INFO] [stdout]     |                --------- fields in this struct
[INFO] [stdout] 886 |         pub toast: String,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 887 |         seasonal_fruit: String,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Appetizer` is never used
[INFO] [stdout]    --> src/main.rs:892:14
[INFO] [stdout]     |
[INFO] [stdout] 892 |     pub enum Appetizer {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `Command { std: "docker" "inspect" "2973bcd490aa792a125792874fa272ded85f1bd7c6ceec4cbb121cec223db6bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2973bcd490aa792a125792874fa272ded85f1bd7c6ceec4cbb121cec223db6bc", kill_on_drop: false }`
[INFO] [stdout] 2973bcd490aa792a125792874fa272ded85f1bd7c6ceec4cbb121cec223db6bc