[INFO] cloning repository https://github.com/maxdotdotg/rust_exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/maxdotdotg/rust_exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxdotdotg%2Frust_exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxdotdotg%2Frust_exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 415483b495fda562ccf51029830316b231861bfb
[INFO] checking maxdotdotg/rust_exercises against try#86f78589b09557f70c9db3f56ad1921e0a9f76ef for pr-138438
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxdotdotg%2Frust_exercises" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/maxdotdotg/rust_exercises on toolchain 86f78589b09557f70c9db3f56ad1921e0a9f76ef
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/maxdotdotg/rust_exercises
[INFO] finished tweaking git repo https://github.com/maxdotdotg/rust_exercises
[INFO] tweaked toml for git repo https://github.com/maxdotdotg/rust_exercises written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/maxdotdotg/rust_exercises 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" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4b1ee1b5cb0218da587595bd49207ea630fbfef25cafed8a908b8763e17e822d
[INFO] running `Command { std: "docker" "start" "-a" "4b1ee1b5cb0218da587595bd49207ea630fbfef25cafed8a908b8763e17e822d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b1ee1b5cb0218da587595bd49207ea630fbfef25cafed8a908b8763e17e822d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b1ee1b5cb0218da587595bd49207ea630fbfef25cafed8a908b8763e17e822d", kill_on_drop: false }`
[INFO] [stdout] 4b1ee1b5cb0218da587595bd49207ea630fbfef25cafed8a908b8763e17e822d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b57ca9a8828a8e7821a33a712b5814f8be1f39e073fc16742a74fb9b310b86d6
[INFO] running `Command { std: "docker" "start" "-a" "b57ca9a8828a8e7821a33a712b5814f8be1f39e073fc16742a74fb9b310b86d6", kill_on_drop: false }`
[INFO] [stderr]     Checking exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/bin/match.rs:60:14
[INFO] [stdout]    |
[INFO] [stdout] 60 |         _ => count += 1,
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count_2` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut count_2 = 0;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_count_2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count_2` is never read
[INFO] [stdout]   --> src/bin/match.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         count_2 += 1;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Nickel` and `Dime` are never constructed
[INFO] [stdout]  --> src/bin/match.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum Coin {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 6 |     Penny,
[INFO] [stdout] 7 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     Dime,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user5`
[INFO] [stdout]   --> src/bin/struct.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let user5 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user5`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `color_var`
[INFO] [stdout]   --> src/bin/struct.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let color_var = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_color_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/bin/struct.rs:57:18
[INFO] [stdout]    |
[INFO] [stdout] 57 |     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: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/bin/struct.rs:60:18
[INFO] [stdout]    |
[INFO] [stdout] 60 |     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: type `IpAddrKind_with_types` should have an upper camel case name
[INFO] [stdout]  --> src/bin/enums.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddrKind_with_types {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `IpAddrKindWithTypes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_four`
[INFO] [stdout]   --> src/bin/enums.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let v_four = IpAddrKind::V4;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_v_four`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_six`
[INFO] [stdout]   --> src/bin/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let v_six = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/bin/option.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     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/bin/option.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     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: `user5`
[INFO] [stdout]   --> src/bin/struct.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let user5 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user5`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `color_var`
[INFO] [stdout]   --> src/bin/struct.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let color_var = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_color_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/bin/enums.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/bin/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loop_again`
[INFO] [stdout]   --> src/bin/enums.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let loop_again = IpAddrKind_with_types::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loop_again`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_kind`
[INFO] [stdout]   --> src/bin/enums.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_kind`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/enums.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind_with_types` 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] 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] 10 -     V4(String),
[INFO] [stdout] 10 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/enums.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind_with_types` 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] 11 -     V6(String),
[INFO] [stdout] 11 +     V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> src/bin/enums.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 16 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 17 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `route` is never used
[INFO] [stdout]   --> src/bin/enums.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/bin/match.rs:60:14
[INFO] [stdout]    |
[INFO] [stdout] 60 |         _ => count += 1,
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count_2` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut count_2 = 0;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_count_2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count_2` is never read
[INFO] [stdout]   --> src/bin/match.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         count_2 += 1;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Nickel` and `Dime` are never constructed
[INFO] [stdout]  --> src/bin/match.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum Coin {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 6 |     Penny,
[INFO] [stdout] 7 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     Dime,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/bin/functions.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `IpAddrKind_with_types` should have an upper camel case name
[INFO] [stdout]  --> src/bin/enums.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddrKind_with_types {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `IpAddrKindWithTypes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/bin/option.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     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: `v_four`
[INFO] [stdout]   --> src/bin/enums.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let v_four = IpAddrKind::V4;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_v_four`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_six`
[INFO] [stdout]   --> src/bin/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let v_six = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/bin/enums.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/bin/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loop_again`
[INFO] [stdout]   --> src/bin/enums.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let loop_again = IpAddrKind_with_types::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loop_again`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_kind`
[INFO] [stdout]   --> src/bin/enums.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_kind`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/enums.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind_with_types` 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] 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] 10 -     V4(String),
[INFO] [stdout] 10 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/enums.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     V6(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddrKind_with_types` 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] 11 -     V6(String),
[INFO] [stdout] 11 +     V6(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> src/bin/enums.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | struct IpAddr {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 16 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 17 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `route` is never used
[INFO] [stdout]   --> src/bin/enums.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/bin/option.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     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: `x`
[INFO] [stdout]   --> src/bin/functions.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "b57ca9a8828a8e7821a33a712b5814f8be1f39e073fc16742a74fb9b310b86d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b57ca9a8828a8e7821a33a712b5814f8be1f39e073fc16742a74fb9b310b86d6", kill_on_drop: false }`
[INFO] [stdout] b57ca9a8828a8e7821a33a712b5814f8be1f39e073fc16742a74fb9b310b86d6