[INFO] cloning repository https://github.com/ihcsim/rust-101
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ihcsim/rust-101" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fihcsim%2Frust-101", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fihcsim%2Frust-101'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 81d57c73b4f1c47a056c10671e31c778f21904c3
[INFO] checking ihcsim/rust-101 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fihcsim%2Frust-101" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ihcsim/rust-101 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ihcsim/rust-101
[INFO] finished tweaking git repo https://github.com/ihcsim/rust-101
[INFO] tweaked toml for git repo https://github.com/ihcsim/rust-101 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/ihcsim/rust-101 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 05c773700a0af1e12991c67b63623f003dadcddc9b7f9f5d47774ef43ae5a442
[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" "05c773700a0af1e12991c67b63623f003dadcddc9b7f9f5d47774ef43ae5a442", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05c773700a0af1e12991c67b63623f003dadcddc9b7f9f5d47774ef43ae5a442", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05c773700a0af1e12991c67b63623f003dadcddc9b7f9f5d47774ef43ae5a442", kill_on_drop: false }`
[INFO] [stdout] 05c773700a0af1e12991c67b63623f003dadcddc9b7f9f5d47774ef43ae5a442
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 42db5a0a8fc001308d2ceda92b69fa9084a22b2a8efe3b8fd87fcb25e62d5cd1
[INFO] running `Command { std: "docker" "start" "-a" "42db5a0a8fc001308d2ceda92b69fa9084a22b2a8efe3b8fd87fcb25e62d5cd1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking rust-101 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/bin/closure.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/bin/matches.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     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/matches.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     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: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/bin/matches.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/bin/matches.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/bin/matches.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/matches.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/bin/traits.rs:63:39
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn notify_trait_bound<T: Summary>(item: &T) {}
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item1`
[INFO] [stdout]   --> src/bin/traits.rs:64:41
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn notify_trait_bound_2<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_item1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/bin/traits.rs:64:52
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn notify_trait_bound_2<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/bin/traits.rs:66:28
[INFO] [stdout]    |
[INFO] [stdout] 66 | pub fn some_function<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/bin/traits.rs:66:35
[INFO] [stdout]    |
[INFO] [stdout] 66 | pub fn some_function<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |                                   ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]   --> src/bin/structures.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let user3 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/bin/structures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `email`
[INFO] [stdout]   --> src/bin/structures.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     email: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/bin/structures.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/bin/structures.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/bin/enumerations.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let four = IpAddrKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/bin/enumerations.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let six = IpAddrKind::V6;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/enumerations.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enumerations.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/bin/ipaddr.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let four = IpAddrKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/bin/ipaddr.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let six = IpAddrKind::V6;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/ipaddr.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/ipaddr.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/bin/enumerations.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let four = IpAddrKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/bin/enumerations.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let six = IpAddrKind::V6;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/enumerations.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enumerations.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f1`
[INFO] [stdout]  --> src/bin/errors.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let f1 = match f1 {
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f2`
[INFO] [stdout]   --> src/bin/errors.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let f2 = match f2 {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f3`
[INFO] [stdout]   --> src/bin/errors.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let f3 = File::open("hello.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f4`
[INFO] [stdout]   --> src/bin/errors.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let f4 = File::open("hello.txt").unwrap();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f5`
[INFO] [stdout]   --> src/bin/errors.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let f5 = File::open("hello.txt").expect("can't open file");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/bin/errors.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/bin/traits.rs:63:39
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn notify_trait_bound<T: Summary>(item: &T) {}
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item1`
[INFO] [stdout]   --> src/bin/traits.rs:64:41
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn notify_trait_bound_2<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_item1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/bin/traits.rs:64:52
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn notify_trait_bound_2<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/bin/traits.rs:66:28
[INFO] [stdout]    |
[INFO] [stdout] 66 | pub fn some_function<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/bin/traits.rs:66:35
[INFO] [stdout]    |
[INFO] [stdout] 66 | pub fn some_function<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |                                   ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f1`
[INFO] [stdout]  --> src/bin/errors.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let f1 = match f1 {
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f2`
[INFO] [stdout]   --> src/bin/errors.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let f2 = match f2 {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f3`
[INFO] [stdout]   --> src/bin/errors.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let f3 = File::open("hello.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f4`
[INFO] [stdout]   --> src/bin/errors.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let f4 = File::open("hello.txt").unwrap();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f5`
[INFO] [stdout]   --> src/bin/errors.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let f5 = File::open("hello.txt").expect("can't open file");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_f5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/bin/errors.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/bin/matches.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     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/matches.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     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: variant is never constructed: `Penny`
[INFO] [stdout]   --> src/bin/matches.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Penny,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]   --> src/bin/matches.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Nickel,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]   --> src/bin/matches.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Dime,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/matches.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]   --> src/bin/structures.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let user3 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/bin/structures.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `email`
[INFO] [stdout]   --> src/bin/structures.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     email: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]   --> src/bin/structures.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     sign_in_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]   --> src/bin/structures.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     active: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/bin/lifetime.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let i = ImportantExcerpt {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/bin/lifetime.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     part: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/bin/lifetime.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let i = ImportantExcerpt {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/bin/lifetime.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     part: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `level`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `announce_and_return_part`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `BinaryTree`
[INFO] [stdout]  --> src/bin/binary_tree.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum BinaryTree {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tree_weight_v1`
[INFO] [stdout]   --> src/bin/binary_tree.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn tree_weight_v1(t: &BinaryTree) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sample_tree`
[INFO] [stdout]   --> src/bin/binary_tree.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn sample_tree() -> BinaryTree {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_to_ordinal`
[INFO] [stdout]   --> src/bin/binary_tree.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn num_to_ordinal(x: u32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `num_to_ordinal_expr`
[INFO] [stdout]   --> src/bin/binary_tree.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn num_to_ordinal_expr(x: u32) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]  --> src/bin/ipaddr.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let four = IpAddrKind::V4;
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/bin/ipaddr.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let six = IpAddrKind::V6;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/ipaddr.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/ipaddr.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     fn call(&self) {}
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.87s
[INFO] running `Command { std: "docker" "inspect" "42db5a0a8fc001308d2ceda92b69fa9084a22b2a8efe3b8fd87fcb25e62d5cd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42db5a0a8fc001308d2ceda92b69fa9084a22b2a8efe3b8fd87fcb25e62d5cd1", kill_on_drop: false }`
[INFO] [stdout] 42db5a0a8fc001308d2ceda92b69fa9084a22b2a8efe3b8fd87fcb25e62d5cd1