[INFO] cloning repository https://github.com/ha1o0/learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ha1o0/learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fha1o0%2Flearn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fha1o0%2Flearn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 846c7a76aeffcf18ec77fd4f186baf31b4e5ca03
[INFO] testing ha1o0/learn-rust against 1.95.0 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fha1o0%2Flearn-rust" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ha1o0/learn-rust
[INFO] finished tweaking git repo https://github.com/ha1o0/learn-rust
[INFO] tweaked toml for git repo https://github.com/ha1o0/learn-rust written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ha1o0/learn-rust on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ha1o0/learn-rust 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tempfile v3.5.0
[INFO] [stderr]   Downloaded tonic-build v0.9.2
[INFO] [stderr]   Downloaded iana-time-zone-haiku v0.1.1
[INFO] [stderr]   Downloaded cxxbridge-flags v1.0.94
[INFO] [stderr]   Downloaded link-cplusplus v1.0.8
[INFO] [stderr]   Downloaded scratch v1.0.5
[INFO] [stderr]   Downloaded matchit v0.7.0
[INFO] [stderr]   Downloaded iana-time-zone v0.1.56
[INFO] [stderr]   Downloaded cxxbridge-macro v1.0.94
[INFO] [stderr]   Downloaded bumpalo v3.12.1
[INFO] [stderr]   Downloaded cxx-build v1.0.94
[INFO] [stderr]   Downloaded tonic v0.9.2
[INFO] [stderr]   Downloaded axum v0.6.17
[INFO] [stderr]   Downloaded h2 v0.3.18
[INFO] [stderr]   Downloaded hyper v0.14.26
[INFO] [stderr]   Downloaded cxx v1.0.94
[INFO] [stderr]   Downloaded chrono v0.4.24
[INFO] [stderr]   Downloaded regex v1.8.1
[INFO] [stderr]   Downloaded rustix v0.37.17
[INFO] [stderr]   Downloaded regex-syntax v0.7.1
[INFO] [stderr]   Downloaded linux-raw-sys v0.3.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab83220a7995c5cfb9245e1f6d8645923614010198acc30db25ef2433fa69e6f
[INFO] running `Command { std: "docker" "start" "-a" "ab83220a7995c5cfb9245e1f6d8645923614010198acc30db25ef2433fa69e6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab83220a7995c5cfb9245e1f6d8645923614010198acc30db25ef2433fa69e6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab83220a7995c5cfb9245e1f6d8645923614010198acc30db25ef2433fa69e6f", kill_on_drop: false }`
[INFO] [stdout] ab83220a7995c5cfb9245e1f6d8645923614010198acc30db25ef2433fa69e6f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ca8d068c8bb6572e0660d8ada5dcb57ebff56cea66bd00654b7a83973754592
[INFO] running `Command { std: "docker" "start" "-a" "4ca8d068c8bb6572e0660d8ada5dcb57ebff56cea66bd00654b7a83973754592", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling libc v0.2.142
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling bytes v1.4.0
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling anyhow v1.0.70
[INFO] [stderr]    Compiling either v1.8.1
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling tokio v1.28.0
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling rustversion v1.0.12
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling io-lifetimes v1.0.10
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling tracing-core v0.1.30
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling futures-sink v0.3.28
[INFO] [stderr]    Compiling rustix v0.37.17
[INFO] [stderr]    Compiling httparse v1.8.0
[INFO] [stderr]    Compiling linux-raw-sys v0.3.6
[INFO] [stderr]    Compiling prettyplease v0.1.25
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling http v0.2.9
[INFO] [stderr]    Compiling tower-service v0.3.2
[INFO] [stderr]    Compiling async-trait v0.1.68
[INFO] [stderr]    Compiling fixedbitset v0.4.2
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling try-lock v0.2.4
[INFO] [stderr]    Compiling regex-syntax v0.7.1
[INFO] [stderr]    Compiling fastrand v1.9.0
[INFO] [stderr]    Compiling syn v2.0.15
[INFO] [stderr]    Compiling num_cpus v1.15.0
[INFO] [stderr]    Compiling mio v0.8.6
[INFO] [stderr]    Compiling socket2 v0.4.9
[INFO] [stderr]    Compiling getrandom v0.2.9
[INFO] [stderr]    Compiling petgraph v0.6.3
[INFO] [stderr]    Compiling axum-core v0.3.4
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling tower-layer v0.3.2
[INFO] [stderr]    Compiling http-body v0.4.5
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling multimap v0.8.3
[INFO] [stderr]    Compiling serde v1.0.160
[INFO] [stderr]    Compiling httpdate v1.0.2
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling axum v0.6.17
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling matchit v0.7.0
[INFO] [stderr]    Compiling percent-encoding v2.2.0
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling base64 v0.21.0
[INFO] [stderr]    Compiling iana-time-zone v0.1.56
[INFO] [stderr]    Compiling which v4.4.0
[INFO] [stderr]    Compiling regex v1.8.1
[INFO] [stderr]    Compiling chrono v0.4.24
[INFO] [stderr]    Compiling tempfile v3.5.0
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.24
[INFO] [stderr]    Compiling prost-derive v0.11.9
[INFO] [stderr]    Compiling pin-project-internal v1.0.12
[INFO] [stderr]    Compiling pin-project v1.0.12
[INFO] [stderr]    Compiling tracing v0.1.37
[INFO] [stderr]    Compiling prost v0.11.9
[INFO] [stderr]    Compiling prost-types v0.11.9
[INFO] [stderr]    Compiling prost-build v0.11.9
[INFO] [stderr]    Compiling tonic-build v0.9.2
[INFO] [stderr]    Compiling tokio-util v0.7.8
[INFO] [stderr]    Compiling tokio-io-timeout v1.2.0
[INFO] [stderr]    Compiling tokio-stream v0.1.14
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling h2 v0.3.18
[INFO] [stderr]    Compiling tower v0.4.13
[INFO] [stderr]    Compiling hyper v0.14.26
[INFO] [stderr]    Compiling hyper-timeout v0.4.1
[INFO] [stderr]    Compiling tonic v0.9.2
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]   --> src/base_type_4_1.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut y = 5;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_y` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/base_type_4_1.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     y = x;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/base_type_4_2.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let v = (2, 3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_option` is never used
[INFO] [stdout]   --> src/base_type_4_4.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn get_option(tp: u8) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_return_fn` is never used
[INFO] [stdout]   --> src/base_type_4_4.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn never_return_fn() -> ! {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/test_1.rs:104:10
[INFO] [stdout]     |
[INFO] [stdout] 104 |     Ipv4(String),
[INFO] [stdout]     |     ---- ^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Ip` 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] 104 -     Ipv4(String),
[INFO] [stdout] 104 +     Ipv4(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Ipv6` is never constructed
[INFO] [stdout]    --> src/test_1.rs:105:5
[INFO] [stdout]     |
[INFO] [stdout] 103 | enum Ip {
[INFO] [stdout]     |      -- variant in this enum
[INFO] [stdout] 104 |     Ipv4(String),
[INFO] [stdout] 105 |     Ipv6(String),
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Ip` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/base_type_4_3.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     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]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 41 -     V4(String),
[INFO] [stdout] 41 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 |     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] 42 -     V6(String),
[INFO] [stdout] 42 +     V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 52.19s
[INFO] running `Command { std: "docker" "inspect" "4ca8d068c8bb6572e0660d8ada5dcb57ebff56cea66bd00654b7a83973754592", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ca8d068c8bb6572e0660d8ada5dcb57ebff56cea66bd00654b7a83973754592", kill_on_drop: false }`
[INFO] [stdout] 4ca8d068c8bb6572e0660d8ada5dcb57ebff56cea66bd00654b7a83973754592
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a5ccba8c7a1ee2964f1d3bc3a196f50a615748234efafca020e2d0ea23e223c
[INFO] running `Command { std: "docker" "start" "-a" "3a5ccba8c7a1ee2964f1d3bc3a196f50a615748234efafca020e2d0ea23e223c", kill_on_drop: false }`
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]   --> src/base_type_4_1.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut y = 5;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_y` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/base_type_4_1.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     y = x;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/base_type_4_2.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let v = (2, 3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_option` is never used
[INFO] [stdout]   --> src/base_type_4_4.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn get_option(tp: u8) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_return_fn` is never used
[INFO] [stdout]   --> src/base_type_4_4.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn never_return_fn() -> ! {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/test_1.rs:104:10
[INFO] [stdout]     |
[INFO] [stdout] 104 |     Ipv4(String),
[INFO] [stdout]     |     ---- ^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Ip` 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] 104 -     Ipv4(String),
[INFO] [stdout] 104 +     Ipv4(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Ipv6` is never constructed
[INFO] [stdout]    --> src/test_1.rs:105:5
[INFO] [stdout]     |
[INFO] [stdout] 103 | enum Ip {
[INFO] [stdout]     |      -- variant in this enum
[INFO] [stdout] 104 |     Ipv4(String),
[INFO] [stdout] 105 |     Ipv6(String),
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Ip` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/base_type_4_3.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling learn-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 |     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]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[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] 41 -     V4(String),
[INFO] [stdout] 41 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 |     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] 42 -     V6(String),
[INFO] [stdout] 42 +     V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]   --> src/base_type_4_1.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut y = 5;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_y` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/base_type_4_1.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     y = x;
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/base_type_4_2.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let v = (2, 3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_option` is never used
[INFO] [stdout]   --> src/base_type_4_4.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn get_option(tp: u8) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_return_fn` is never used
[INFO] [stdout]   --> src/base_type_4_4.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn never_return_fn() -> ! {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/test_1.rs:104:10
[INFO] [stdout]     |
[INFO] [stdout] 104 |     Ipv4(String),
[INFO] [stdout]     |     ---- ^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Ip` 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] 104 -     Ipv4(String),
[INFO] [stdout] 104 +     Ipv4(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Ipv6` is never constructed
[INFO] [stdout]    --> src/test_1.rs:105:5
[INFO] [stdout]     |
[INFO] [stdout] 103 | enum Ip {
[INFO] [stdout]     |      -- variant in this enum
[INFO] [stdout] 104 |     Ipv4(String),
[INFO] [stdout] 105 |     Ipv6(String),
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Ip` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/base_type_4_3.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.63s
[INFO] running `Command { std: "docker" "inspect" "3a5ccba8c7a1ee2964f1d3bc3a196f50a615748234efafca020e2d0ea23e223c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a5ccba8c7a1ee2964f1d3bc3a196f50a615748234efafca020e2d0ea23e223c", kill_on_drop: false }`
[INFO] [stdout] 3a5ccba8c7a1ee2964f1d3bc3a196f50a615748234efafca020e2d0ea23e223c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] eb53a4fc73e80417d1e16bfb21a3a793ca14754e873899a1f0d4ce719ee34684
[INFO] running `Command { std: "docker" "start" "-a" "eb53a4fc73e80417d1e16bfb21a3a793ca14754e873899a1f0d4ce719ee34684", kill_on_drop: false }`
[INFO] [stderr] warning: variable `y` is assigned to, but never used
[INFO] [stderr]   --> src/base_type_4_1.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut y = 5;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_y` instead
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/base_type_4_1.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     y = x;
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/base_type_4_2.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let v = (2, 3);
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: function `get_option` is never used
[INFO] [stderr]   --> src/base_type_4_4.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn get_option(tp: u8) -> Option<i32> {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `never_return_fn` is never used
[INFO] [stderr]   --> src/base_type_4_4.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn never_return_fn() -> ! {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]    --> src/test_1.rs:104:10
[INFO] [stderr]     |
[INFO] [stderr] 104 |     Ipv4(String),
[INFO] [stderr]     |     ---- ^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     field in this variant
[INFO] [stderr]     |
[INFO] [stderr]     = note: `Ip` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]     |
[INFO] [stderr] 104 -     Ipv4(String),
[INFO] [stderr] 104 +     Ipv4(()),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Ipv6` is never constructed
[INFO] [stderr]    --> src/test_1.rs:105:5
[INFO] [stderr]     |
[INFO] [stderr] 103 | enum Ip {
[INFO] [stderr]     |      -- variant in this enum
[INFO] [stderr] 104 |     Ipv4(String),
[INFO] [stderr] 105 |     Ipv6(String),
[INFO] [stderr]     |     ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `Ip` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/base_type_4_3.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         2 * x;
[INFO] [stderr]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 21 |         let _ = 2 * x;
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `learn-rust` (lib) generated 8 warnings (run `cargo fix --lib -p learn-rust` to apply 1 suggestion)
[INFO] [stderr] warning: `learn-rust` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/main.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 |     V4(String),
[INFO] [stderr]    |     -- ^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 41 -     V4(String),
[INFO] [stderr] 41 +     V4(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/main.rs:42:8
[INFO] [stderr]    |
[INFO] [stderr] 42 |     V6(String),
[INFO] [stderr]    |     -- ^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 42 -     V6(String),
[INFO] [stderr] 42 +     V6(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `learn-rust` (bin "learn-rust" test) generated 2 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/learn_rust-5ed07ba057841d13)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test test_1::test_empty_cc_number ... ok
[INFO] [stdout] test test_1::test_invalid_cc_number ... ok
[INFO] [stdout] test test_1::test_single_digit_cc_number ... ok
[INFO] [stdout] test test_1::test_non_digit_cc_number ... ok
[INFO] [stdout] test test_1::test_valid_cc_number ... ok
[INFO] [stdout] test test_1::test_two_digit_cc_number ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 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/learn_rust-2db938322d477329)
[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 learn_rust
[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" "eb53a4fc73e80417d1e16bfb21a3a793ca14754e873899a1f0d4ce719ee34684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb53a4fc73e80417d1e16bfb21a3a793ca14754e873899a1f0d4ce719ee34684", kill_on_drop: false }`
[INFO] [stdout] eb53a4fc73e80417d1e16bfb21a3a793ca14754e873899a1f0d4ce719ee34684
