Dec 02 06:57:40.345 INFO testing ICimpoes/rusty-train against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 06:57:40.345 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-3/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 02 06:57:40.731 INFO [stdout] f480bc8c12248570fd4979f288e30497b55912f6e7a49c619aa3c706d21a04b4
Dec 02 06:57:40.734 INFO running `"docker" "start" "-a" "f480bc8c12248570fd4979f288e30497b55912f6e7a49c619aa3c706d21a04b4"`
Dec 02 06:57:42.035 INFO [stderr] usermod: no changes
Dec 02 06:57:42.111 INFO [stderr]    Compiling rusty-train v0.1.0 (/source)
Dec 02 06:57:42.548 INFO [stderr] warning: function is never used: `middle_function`
Dec 02 06:57:42.548 INFO [stderr]  --> src/communicator/lib/mod.rs:6:5
Dec 02 06:57:42.548 INFO [stderr]   |
Dec 02 06:57:42.548 INFO [stderr] 6 |     pub fn middle_function() {
Dec 02 06:57:42.548 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:42.548 INFO [stderr]   |
Dec 02 06:57:42.548 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 02 06:57:42.548 INFO [stderr] 
Dec 02 06:57:42.549 INFO [stderr] warning: function is never used: `middle_secret_function`
Dec 02 06:57:42.549 INFO [stderr]   --> src/communicator/lib/mod.rs:10:5
Dec 02 06:57:42.549 INFO [stderr]    |
Dec 02 06:57:42.549 INFO [stderr] 10 |     fn middle_secret_function() {
Dec 02 06:57:42.549 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:42.549 INFO [stderr] 
Dec 02 06:57:42.549 INFO [stderr] warning: function is never used: `inner_function`
Dec 02 06:57:42.549 INFO [stderr]   --> src/communicator/lib/mod.rs:17:9
Dec 02 06:57:42.549 INFO [stderr]    |
Dec 02 06:57:42.549 INFO [stderr] 17 |         pub fn inner_function() {}
Dec 02 06:57:42.549 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:42.549 INFO [stderr] 
Dec 02 06:57:42.549 INFO [stderr] warning: function is never used: `secret_function`
Dec 02 06:57:42.549 INFO [stderr]   --> src/communicator/lib/mod.rs:19:9
Dec 02 06:57:42.549 INFO [stderr]    |
Dec 02 06:57:42.549 INFO [stderr] 19 |         fn secret_function() {
Dec 02 06:57:42.549 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:42.549 INFO [stderr] 
Dec 02 06:57:42.549 INFO [stderr] warning: function is never used: `inner_function`
Dec 02 06:57:42.549 INFO [stderr]   --> src/communicator/lib/mod.rs:26:13
Dec 02 06:57:42.549 INFO [stderr]    |
Dec 02 06:57:42.549 INFO [stderr] 26 |             pub fn inner_function() {
Dec 02 06:57:42.549 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:42.549 INFO [stderr] 
Dec 02 06:57:42.549 INFO [stderr] warning: function is never used: `try_me`
Dec 02 06:57:42.549 INFO [stderr]   --> src/communicator/lib/mod.rs:56:1
Dec 02 06:57:42.549 INFO [stderr]    |
Dec 02 06:57:42.549 INFO [stderr] 56 | fn try_me() {
Dec 02 06:57:42.549 INFO [stderr]    | ^^^^^^^^^^^
Dec 02 06:57:42.549 INFO [stderr] 
Dec 02 06:57:42.549 INFO [stderr] warning: function is never used: `prints_and_returns_10`
Dec 02 06:57:42.549 INFO [stderr]   --> src/communicator/lib/mod.rs:89:1
Dec 02 06:57:42.549 INFO [stderr]    |
Dec 02 06:57:42.549 INFO [stderr] 89 | fn prints_and_returns_10(a: i32) -> i32 {
Dec 02 06:57:42.549 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:42.549 INFO [stderr] 
Dec 02 06:57:43.968 INFO [stderr] warning: unused variable: `ip_type`
Dec 02 06:57:43.968 INFO [stderr]  --> src/chapter6/bin/main.rs:1:10
Dec 02 06:57:43.968 INFO [stderr]   |
Dec 02 06:57:43.968 INFO [stderr] 1 | fn route(ip_type: IpAddrKind) { }
Dec 02 06:57:43.968 INFO [stderr]   |          ^^^^^^^ help: consider using `_ip_type` instead
Dec 02 06:57:43.968 INFO [stderr]   |
Dec 02 06:57:43.968 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:43.968 INFO [stderr] 
Dec 02 06:57:43.968 INFO [stderr] warning: unused variable: `x`
Dec 02 06:57:43.968 INFO [stderr]   --> src/chapter6/bin/main.rs:32:35
Dec 02 06:57:43.968 INFO [stderr]    |
Dec 02 06:57:43.968 INFO [stderr] 32 |     let x = some_string.and_then(|x: &str| Some("sf"));
Dec 02 06:57:43.968 INFO [stderr]    |                                   ^ help: consider using `_x` instead
Dec 02 06:57:43.968 INFO [stderr] 
Dec 02 06:57:43.968 INFO [stderr] warning: unused variable: `six`
Dec 02 06:57:43.968 INFO [stderr]   --> src/chapter6/bin/main.rs:11:9
Dec 02 06:57:43.968 INFO [stderr]    |
Dec 02 06:57:43.968 INFO [stderr] 11 |     let six = IpAddrKind::V6;
Dec 02 06:57:43.968 INFO [stderr]    |         ^^^ help: consider using `_six` instead
Dec 02 06:57:43.968 INFO [stderr] 
Dec 02 06:57:43.968 INFO [stderr] warning: unused variable: `home`
Dec 02 06:57:43.968 INFO [stderr]   --> src/chapter6/bin/main.rs:18:9
Dec 02 06:57:43.968 INFO [stderr]    |
Dec 02 06:57:43.968 INFO [stderr] 18 |     let home = IpAddr::V4(String::from("127.0.0.1"));
Dec 02 06:57:43.968 INFO [stderr]    |         ^^^^ help: consider using `_home` instead
Dec 02 06:57:43.968 INFO [stderr] 
Dec 02 06:57:43.968 INFO [stderr] warning: unused variable: `loopback`
Dec 02 06:57:43.968 INFO [stderr]   --> src/chapter6/bin/main.rs:19:9
Dec 02 06:57:43.968 INFO [stderr]    |
Dec 02 06:57:43.968 INFO [stderr] 19 |     let loopback = IpAddr::V6(String::from("::1"));
Dec 02 06:57:43.968 INFO [stderr]    |         ^^^^^^^^ help: consider using `_loopback` instead
Dec 02 06:57:43.968 INFO [stderr] 
Dec 02 06:57:43.968 INFO [stderr] warning: unused variable: `home`
Dec 02 06:57:43.968 INFO [stderr]   --> src/chapter6/bin/main.rs:21:9
Dec 02 06:57:43.968 INFO [stderr]    |
Dec 02 06:57:43.969 INFO [stderr] 21 |     let home = IpAddr2::V4(127, 0, 0, 1);
Dec 02 06:57:43.969 INFO [stderr]    |         ^^^^ help: consider using `_home` instead
Dec 02 06:57:43.969 INFO [stderr] 
Dec 02 06:57:43.969 INFO [stderr] warning: unused variable: `loopback`
Dec 02 06:57:43.969 INFO [stderr]   --> src/chapter6/bin/main.rs:22:9
Dec 02 06:57:43.969 INFO [stderr]    |
Dec 02 06:57:43.969 INFO [stderr] 22 |     let loopback = IpAddr2::V6(String::from("::1"));
Dec 02 06:57:43.969 INFO [stderr]    |         ^^^^^^^^ help: consider using `_loopback` instead
Dec 02 06:57:43.969 INFO [stderr] 
Dec 02 06:57:43.972 INFO [stderr] warning: variable `count` is assigned to, but never used
Dec 02 06:57:43.972 INFO [stderr]   --> src/chapter6/bin/main.rs:72:13
Dec 02 06:57:43.972 INFO [stderr]    |
Dec 02 06:57:43.972 INFO [stderr] 72 |     let mut count = 0;
Dec 02 06:57:43.972 INFO [stderr]    |             ^^^^^
Dec 02 06:57:43.972 INFO [stderr]    |
Dec 02 06:57:43.972 INFO [stderr]    = note: consider using `_count` instead
Dec 02 06:57:43.972 INFO [stderr] 
Dec 02 06:57:43.972 INFO [stderr] warning: value assigned to `count` is never read
Dec 02 06:57:43.972 INFO [stderr]   --> src/chapter6/bin/main.rs:76:9
Dec 02 06:57:43.972 INFO [stderr]    |
Dec 02 06:57:43.972 INFO [stderr] 76 |         count += 1;
Dec 02 06:57:43.972 INFO [stderr]    |         ^^^^^
Dec 02 06:57:43.972 INFO [stderr]    |
Dec 02 06:57:43.972 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 02 06:57:43.972 INFO [stderr] 
Dec 02 06:57:44.003 INFO [stderr] warning: variant is never constructed: `Quit`
Dec 02 06:57:44.004 INFO [stderr]   --> src/chapter6/bin/main.rs:94:5
Dec 02 06:57:44.004 INFO [stderr]    |
Dec 02 06:57:44.004 INFO [stderr] 94 |     Quit,
Dec 02 06:57:44.004 INFO [stderr]    |     ^^^^
Dec 02 06:57:44.004 INFO [stderr]    |
Dec 02 06:57:44.004 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:44.004 INFO [stderr] 
Dec 02 06:57:44.004 INFO [stderr] warning: variant is never constructed: `Move`
Dec 02 06:57:44.004 INFO [stderr]   --> src/chapter6/bin/main.rs:95:5
Dec 02 06:57:44.004 INFO [stderr]    |
Dec 02 06:57:44.004 INFO [stderr] 95 |     Move { x: i32, y: i32 },
Dec 02 06:57:44.004 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:44.004 INFO [stderr] 
Dec 02 06:57:44.004 INFO [stderr] warning: variant is never constructed: `ChangeColor`
Dec 02 06:57:44.004 INFO [stderr]   --> src/chapter6/bin/main.rs:97:5
Dec 02 06:57:44.004 INFO [stderr]    |
Dec 02 06:57:44.004 INFO [stderr] 97 |     ChangeColor(i32, i32, i32),
Dec 02 06:57:44.004 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:44.004 INFO [stderr] 
Dec 02 06:57:44.004 INFO [stderr] warning: variant is never constructed: `Alaska`
Dec 02 06:57:44.004 INFO [stderr]    --> src/chapter6/bin/main.rs:115:5
Dec 02 06:57:44.004 INFO [stderr]     |
Dec 02 06:57:44.004 INFO [stderr] 115 |     Alaska,
Dec 02 06:57:44.004 INFO [stderr]     |     ^^^^^^
Dec 02 06:57:44.004 INFO [stderr] 
Dec 02 06:57:44.004 INFO [stderr] warning: variant is never constructed: `Nickel`
Dec 02 06:57:44.004 INFO [stderr]    --> src/chapter6/bin/main.rs:121:5
Dec 02 06:57:44.004 INFO [stderr]     |
Dec 02 06:57:44.004 INFO [stderr] 121 |     Nickel,
Dec 02 06:57:44.004 INFO [stderr]     |     ^^^^^^
Dec 02 06:57:44.004 INFO [stderr] 
Dec 02 06:57:44.171 INFO [stderr] warning: function is never used: `max_ch`
Dec 02 06:57:44.171 INFO [stderr]   --> src/generics/bin/main.rs:51:1
Dec 02 06:57:44.171 INFO [stderr]    |
Dec 02 06:57:44.171 INFO [stderr] 51 | fn max_ch(list: &[char]) -> Option<char> {
Dec 02 06:57:44.171 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:44.191 INFO [stderr]    |
Dec 02 06:57:44.191 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:44.191 INFO [stderr] 
Dec 02 06:57:44.779 INFO [stderr] warning: unused variable: `black`
Dec 02 06:57:44.779 INFO [stderr]   --> src/chapter5/bin/main.rs:23:9
Dec 02 06:57:44.779 INFO [stderr]    |
Dec 02 06:57:44.779 INFO [stderr] 23 |     let black = Color(0, 0, 0);
Dec 02 06:57:44.779 INFO [stderr]    |         ^^^^^ help: consider using `_black` instead
Dec 02 06:57:44.779 INFO [stderr]    |
Dec 02 06:57:44.779 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 02 06:57:44.779 INFO [stderr] 
Dec 02 06:57:44.779 INFO [stderr] warning: unused variable: `origin`
Dec 02 06:57:44.779 INFO [stderr]   --> src/chapter5/bin/main.rs:24:9
Dec 02 06:57:44.779 INFO [stderr]    |
Dec 02 06:57:44.779 INFO [stderr] 24 |     let origin = Point(0, 0, 0);
Dec 02 06:57:44.779 INFO [stderr]    |         ^^^^^^ help: consider using `_origin` instead
Dec 02 06:57:44.779 INFO [stderr] 
Dec 02 06:57:44.795 INFO [stderr] warning: function is never used: `build_user`
Dec 02 06:57:44.795 INFO [stderr]    --> src/chapter5/bin/main.rs:103:1
Dec 02 06:57:44.795 INFO [stderr]     |
Dec 02 06:57:44.795 INFO [stderr] 103 | fn build_user(email: String, username: String) -> User {
Dec 02 06:57:44.795 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:44.795 INFO [stderr]     |
Dec 02 06:57:44.795 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 02 06:57:44.795 INFO [stderr] 
Dec 02 06:57:45.340 INFO [stderr] warning: unused imports: `Red`, `Yellow`
Dec 02 06:57:45.341 INFO [stderr]  --> src/chapter7/bin/main.rs:3:34
Dec 02 06:57:45.341 INFO [stderr]   |
Dec 02 06:57:45.341 INFO [stderr] 3 | use communicator::TrafficLight::{Red, Yellow};
Dec 02 06:57:45.341 INFO [stderr]   |                                  ^^^  ^^^^^^
Dec 02 06:57:45.341 INFO [stderr]   |
Dec 02 06:57:45.341 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 02 06:57:45.341 INFO [stderr] 
Dec 02 06:57:45.367 INFO [stderr] warning: unused variable: `red`
Dec 02 06:57:45.367 INFO [stderr]  --> src/chapter7/bin/main.rs:8:9
Dec 02 06:57:45.367 INFO [stderr]   |
Dec 02 06:57:45.367 INFO [stderr] 8 |     let red = Red;
Dec 02 06:57:45.367 INFO [stderr]   |         ^^^ help: consider using `_red` instead
Dec 02 06:57:45.367 INFO [stderr]   |
Dec 02 06:57:45.367 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:45.367 INFO [stderr] 
Dec 02 06:57:45.367 INFO [stderr] warning: unused variable: `yellow`
Dec 02 06:57:45.367 INFO [stderr]  --> src/chapter7/bin/main.rs:9:9
Dec 02 06:57:45.367 INFO [stderr]   |
Dec 02 06:57:45.367 INFO [stderr] 9 |     let yellow = Yellow;
Dec 02 06:57:45.367 INFO [stderr]   |         ^^^^^^ help: consider using `_yellow` instead
Dec 02 06:57:45.367 INFO [stderr] 
Dec 02 06:57:45.367 INFO [stderr] warning: unused variable: `green`
Dec 02 06:57:45.367 INFO [stderr]   --> src/chapter7/bin/main.rs:10:9
Dec 02 06:57:45.367 INFO [stderr]    |
Dec 02 06:57:45.367 INFO [stderr] 10 |     let green = communicator::TrafficLight::Green;
Dec 02 06:57:45.367 INFO [stderr]    |         ^^^^^ help: consider using `_green` instead
Dec 02 06:57:45.367 INFO [stderr] 
Dec 02 06:57:45.367 INFO [stderr] warning: unused variable: `green`
Dec 02 06:57:45.367 INFO [stderr]   --> src/chapter7/bin/main.rs:14:9
Dec 02 06:57:45.367 INFO [stderr]    |
Dec 02 06:57:45.367 INFO [stderr] 14 |     let green = Green;
Dec 02 06:57:45.367 INFO [stderr]    |         ^^^^^ help: consider using `_green` instead
Dec 02 06:57:45.367 INFO [stderr] 
Dec 02 06:57:45.412 INFO [stderr] warning: unnecessary parentheses around assigned value
Dec 02 06:57:45.412 INFO [stderr]    --> src/collections/bin/main.rs:181:14
Dec 02 06:57:45.412 INFO [stderr]     |
Dec 02 06:57:45.412 INFO [stderr] 181 |         t += (*i as f32);
Dec 02 06:57:45.412 INFO [stderr]     |              ^^^^^^^^^^^ help: remove these parentheses
Dec 02 06:57:45.412 INFO [stderr]     |
Dec 02 06:57:45.412 INFO [stderr]     = note: #[warn(unused_parens)] on by default
Dec 02 06:57:45.412 INFO [stderr] 
Dec 02 06:57:45.439 INFO [stderr] warning: unused variable: `t`
Dec 02 06:57:45.439 INFO [stderr]   --> src/traits/bin/main.rs:83:24
Dec 02 06:57:45.439 INFO [stderr]    |
Dec 02 06:57:45.439 INFO [stderr] 83 | fn some_function<T, U>(t: T, u: U) -> i32
Dec 02 06:57:45.439 INFO [stderr]    |                        ^ help: consider using `_t` instead
Dec 02 06:57:45.439 INFO [stderr]    |
Dec 02 06:57:45.439 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 02 06:57:45.439 INFO [stderr] 
Dec 02 06:57:45.439 INFO [stderr] warning: unused variable: `u`
Dec 02 06:57:45.439 INFO [stderr]   --> src/traits/bin/main.rs:83:30
Dec 02 06:57:45.439 INFO [stderr]    |
Dec 02 06:57:45.439 INFO [stderr] 83 | fn some_function<T, U>(t: T, u: U) -> i32
Dec 02 06:57:45.439 INFO [stderr]    |                              ^ help: consider using `_u` instead
Dec 02 06:57:45.439 INFO [stderr] 
Dec 02 06:57:45.440 INFO [stderr] warning: function is never used: `some_function`
Dec 02 06:57:45.440 INFO [stderr]   --> src/traits/bin/main.rs:83:1
Dec 02 06:57:45.440 INFO [stderr]    |
Dec 02 06:57:45.440 INFO [stderr] 83 | / fn some_function<T, U>(t: T, u: U) -> i32
Dec 02 06:57:45.440 INFO [stderr] 84 | |     where T: std::fmt::Display + Clone,
Dec 02 06:57:45.440 INFO [stderr] 85 | |           U: Clone + std::fmt::Debug {
Dec 02 06:57:45.440 INFO [stderr] 86 | |     1
Dec 02 06:57:45.440 INFO [stderr] 87 | | }
Dec 02 06:57:45.440 INFO [stderr]    | |_^
Dec 02 06:57:45.440 INFO [stderr]    |
Dec 02 06:57:45.440 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:45.440 INFO [stderr] 
Dec 02 06:57:45.440 INFO [stderr] warning: struct is never constructed: `Pair`
Dec 02 06:57:45.440 INFO [stderr]   --> src/traits/bin/main.rs:92:1
Dec 02 06:57:45.440 INFO [stderr]    |
Dec 02 06:57:45.440 INFO [stderr] 92 | struct Pair<T> {
Dec 02 06:57:45.440 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 02 06:57:45.440 INFO [stderr] 
Dec 02 06:57:45.440 INFO [stderr] warning: method is never used: `new`
Dec 02 06:57:45.440 INFO [stderr]   --> src/traits/bin/main.rs:98:5
Dec 02 06:57:45.440 INFO [stderr]    |
Dec 02 06:57:45.440 INFO [stderr] 98 |     fn new(x: T, y: T) -> Self {
Dec 02 06:57:45.440 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:45.440 INFO [stderr] 
Dec 02 06:57:45.440 INFO [stderr] warning: method is never used: `cmp_display`
Dec 02 06:57:45.440 INFO [stderr]    --> src/traits/bin/main.rs:107:5
Dec 02 06:57:45.440 INFO [stderr]     |
Dec 02 06:57:45.440 INFO [stderr] 107 |     fn cmp_display(&self) {
Dec 02 06:57:45.440 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:45.440 INFO [stderr] 
Dec 02 06:57:45.931 INFO [stderr] warning: unused variable: `s`
Dec 02 06:57:45.931 INFO [stderr]  --> src/lifetimes/bin/main.rs:5:13
Dec 02 06:57:45.931 INFO [stderr]   |
Dec 02 06:57:45.931 INFO [stderr] 5 |         let s: &'static str = "asdsa";
Dec 02 06:57:45.931 INFO [stderr]   |             ^ help: consider using `_s` instead
Dec 02 06:57:45.931 INFO [stderr]   |
Dec 02 06:57:45.931 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:45.931 INFO [stderr] 
Dec 02 06:57:45.931 INFO [stderr] warning: unused variable: `y`
Dec 02 06:57:45.931 INFO [stderr]   --> src/lifetimes/bin/main.rs:40:29
Dec 02 06:57:45.931 INFO [stderr]    |
Dec 02 06:57:45.931 INFO [stderr] 40 | fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
Dec 02 06:57:45.931 INFO [stderr]    |                             ^ help: consider using `_y` instead
Dec 02 06:57:45.931 INFO [stderr] 
Dec 02 06:57:45.931 INFO [stderr] warning: unused variable: `y`
Dec 02 06:57:45.931 INFO [stderr]   --> src/lifetimes/bin/main.rs:44:29
Dec 02 06:57:45.931 INFO [stderr]    |
Dec 02 06:57:45.931 INFO [stderr] 44 | fn longest3<'a>(x: &'a str, y: &str) -> &'a str {
Dec 02 06:57:45.931 INFO [stderr]    |                             ^ help: consider using `_y` instead
Dec 02 06:57:45.931 INFO [stderr] 
Dec 02 06:57:45.983 INFO [stderr] warning: function is never used: `longest3`
Dec 02 06:57:45.983 INFO [stderr]   --> src/lifetimes/bin/main.rs:44:1
Dec 02 06:57:45.983 INFO [stderr]    |
Dec 02 06:57:45.983 INFO [stderr] 44 | fn longest3<'a>(x: &'a str, y: &str) -> &'a str {
Dec 02 06:57:45.983 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:45.983 INFO [stderr]    |
Dec 02 06:57:45.983 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:45.983 INFO [stderr] 
Dec 02 06:57:45.983 INFO [stderr] warning: field is never used: `a`
Dec 02 06:57:45.983 INFO [stderr]   --> src/lifetimes/bin/main.rs:50:5
Dec 02 06:57:45.983 INFO [stderr]    |
Dec 02 06:57:45.983 INFO [stderr] 50 |     a: String,
Dec 02 06:57:45.983 INFO [stderr]    |     ^^^^^^^^^
Dec 02 06:57:45.983 INFO [stderr] 
Dec 02 06:57:45.983 INFO [stderr] warning: method is never used: `level`
Dec 02 06:57:45.983 INFO [stderr]   --> src/lifetimes/bin/main.rs:54:5
Dec 02 06:57:45.983 INFO [stderr]    |
Dec 02 06:57:45.983 INFO [stderr] 54 |     fn level(&self) -> i32 {
Dec 02 06:57:45.983 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:45.983 INFO [stderr] 
Dec 02 06:57:45.983 INFO [stderr] warning: method is never used: `a`
Dec 02 06:57:45.983 INFO [stderr]   --> src/lifetimes/bin/main.rs:60:5
Dec 02 06:57:45.983 INFO [stderr]    |
Dec 02 06:57:45.983 INFO [stderr] 60 |     fn a(&self) -> &str {
Dec 02 06:57:45.983 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:45.983 INFO [stderr] 
Dec 02 06:57:45.983 INFO [stderr] warning: function is never used: `longest_with_an_announcement`
Dec 02 06:57:45.983 INFO [stderr]   --> src/lifetimes/bin/main.rs:67:1
Dec 02 06:57:45.983 INFO [stderr]    |
Dec 02 06:57:45.983 INFO [stderr] 67 | / fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
Dec 02 06:57:45.983 INFO [stderr] 68 | |     where T: Display
Dec 02 06:57:45.983 INFO [stderr] 69 | | {
Dec 02 06:57:45.983 INFO [stderr] 70 | |     println!("Announcement! {}", ann);
Dec 02 06:57:45.983 INFO [stderr] ...  |
Dec 02 06:57:45.983 INFO [stderr] 75 | |     }
Dec 02 06:57:45.983 INFO [stderr] 76 | | }
Dec 02 06:57:45.983 INFO [stderr]    | |_^
Dec 02 06:57:45.983 INFO [stderr] 
Dec 02 06:57:46.103 INFO [stderr] warning: unused variable: `s1`
Dec 02 06:57:46.103 INFO [stderr]   --> src/collections/bin/main.rs:99:9
Dec 02 06:57:46.103 INFO [stderr]    |
Dec 02 06:57:46.103 INFO [stderr] 99 |     let s1 = String::from("hello");
Dec 02 06:57:46.103 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 02 06:57:46.127 INFO [stderr]    |
Dec 02 06:57:46.127 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 02 06:57:46.127 INFO [stderr] 
Dec 02 06:57:46.135 INFO [stderr] warning: unused variable: `scores`
Dec 02 06:57:46.135 INFO [stderr]    --> src/collections/bin/main.rs:143:9
Dec 02 06:57:46.135 INFO [stderr]     |
Dec 02 06:57:46.135 INFO [stderr] 143 |     let scores: HashMap<_, _> = zipped.collect();
Dec 02 06:57:46.135 INFO [stderr]     |         ^^^^^^ help: consider using `_scores` instead
Dec 02 06:57:46.135 INFO [stderr] 
Dec 02 06:57:46.415 INFO [stderr] warning: variable does not need to be mutable
Dec 02 06:57:46.415 INFO [stderr]   --> src/collections/bin/main.rs:56:9
Dec 02 06:57:46.415 INFO [stderr]    |
Dec 02 06:57:46.415 INFO [stderr] 56 |     let mut s = String::new();
Dec 02 06:57:46.415 INFO [stderr]    |         ----^
Dec 02 06:57:46.415 INFO [stderr]    |         |
Dec 02 06:57:46.415 INFO [stderr]    |         help: remove this `mut`
Dec 02 06:57:46.415 INFO [stderr]    |
Dec 02 06:57:46.415 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 02 06:57:46.415 INFO [stderr] 
Dec 02 06:57:47.635 INFO [stderr] warning: unused variable: `v`
Dec 02 06:57:47.635 INFO [stderr]  --> src/errors/bin/main.rs:5:9
Dec 02 06:57:47.635 INFO [stderr]   |
Dec 02 06:57:47.635 INFO [stderr] 5 |     let v = vec![1, 2, 3];
Dec 02 06:57:47.635 INFO [stderr]   |         ^ help: consider using `_v` instead
Dec 02 06:57:47.635 INFO [stderr]   |
Dec 02 06:57:47.635 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:47.635 INFO [stderr] 
Dec 02 06:57:47.635 INFO [stderr] warning: unused variable: `f`
Dec 02 06:57:47.635 INFO [stderr]   --> src/errors/bin/main.rs:23:9
Dec 02 06:57:47.635 INFO [stderr]    |
Dec 02 06:57:47.635 INFO [stderr] 23 |     let f = match f {
Dec 02 06:57:47.635 INFO [stderr]    |         ^ help: consider using `_f` instead
Dec 02 06:57:47.635 INFO [stderr] 
Dec 02 06:57:47.635 INFO [stderr] warning: function is never used: `read_username_from_file`
Dec 02 06:57:47.635 INFO [stderr]   --> src/errors/bin/main.rs:44:1
Dec 02 06:57:47.635 INFO [stderr]    |
Dec 02 06:57:47.635 INFO [stderr] 44 | fn read_username_from_file() -> Result<String, io::Error> {
Dec 02 06:57:47.635 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:47.635 INFO [stderr]    |
Dec 02 06:57:47.635 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:47.635 INFO [stderr] 
Dec 02 06:57:47.635 INFO [stderr] warning: function is never used: `read_username_from_file2`
Dec 02 06:57:47.635 INFO [stderr]   --> src/errors/bin/main.rs:60:1
Dec 02 06:57:47.635 INFO [stderr]    |
Dec 02 06:57:47.635 INFO [stderr] 60 | fn read_username_from_file2() -> Result<String, io::Error> {
Dec 02 06:57:47.635 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:47.635 INFO [stderr] 
Dec 02 06:57:47.659 INFO [stderr] warning: function `openFile` should have a snake case name such as `open_file`
Dec 02 06:57:47.659 INFO [stderr]   --> src/errors/bin/main.rs:20:1
Dec 02 06:57:47.659 INFO [stderr]    |
Dec 02 06:57:47.659 INFO [stderr] 20 | / fn openFile() {
Dec 02 06:57:47.659 INFO [stderr] 21 | |     let f = File::open("hello.txt");
Dec 02 06:57:47.659 INFO [stderr] 22 | |
Dec 02 06:57:47.659 INFO [stderr] 23 | |     let f = match f {
Dec 02 06:57:47.659 INFO [stderr] ...  |
Dec 02 06:57:47.659 INFO [stderr] 40 | |     };
Dec 02 06:57:47.659 INFO [stderr] 41 | | }
Dec 02 06:57:47.659 INFO [stderr]    | |_^
Dec 02 06:57:47.659 INFO [stderr]    |
Dec 02 06:57:47.667 INFO [stderr]    = note: #[warn(non_snake_case)] on by default
Dec 02 06:57:47.667 INFO [stderr] 
Dec 02 06:57:48.527 INFO [stderr] warning: unused variable: `black`
Dec 02 06:57:48.527 INFO [stderr]    --> src/chapter3/bin/main.rs:107:9
Dec 02 06:57:48.527 INFO [stderr]     |
Dec 02 06:57:48.527 INFO [stderr] 107 |     let black = Color(0, 0, 0);
Dec 02 06:57:48.527 INFO [stderr]     |         ^^^^^ help: consider using `_black` instead
Dec 02 06:57:48.527 INFO [stderr]     |
Dec 02 06:57:48.527 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 02 06:57:48.527 INFO [stderr] 
Dec 02 06:57:48.527 INFO [stderr] warning: unused variable: `origin`
Dec 02 06:57:48.527 INFO [stderr]    --> src/chapter3/bin/main.rs:108:9
Dec 02 06:57:48.527 INFO [stderr]     |
Dec 02 06:57:48.527 INFO [stderr] 108 |     let origin = Point(0, 0, 0);
Dec 02 06:57:48.527 INFO [stderr]     |         ^^^^^^ help: consider using `_origin` instead
Dec 02 06:57:48.527 INFO [stderr] 
Dec 02 06:57:48.671 INFO [stderr] warning: function is never used: `gives_ownership`
Dec 02 06:57:48.671 INFO [stderr]    --> src/chapter3/bin/main.rs:119:1
Dec 02 06:57:48.671 INFO [stderr]     |
Dec 02 06:57:48.671 INFO [stderr] 119 | fn gives_ownership() -> String {
Dec 02 06:57:48.671 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:48.671 INFO [stderr]     |
Dec 02 06:57:48.671 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 02 06:57:48.671 INFO [stderr] 
Dec 02 06:57:48.671 INFO [stderr] warning: function is never used: `takes_and_gives_back`
Dec 02 06:57:48.671 INFO [stderr]    --> src/chapter3/bin/main.rs:124:1
Dec 02 06:57:48.671 INFO [stderr]     |
Dec 02 06:57:48.671 INFO [stderr] 124 | fn takes_and_gives_back(a_string: String) -> String {
Dec 02 06:57:48.671 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:48.671 INFO [stderr] 
Dec 02 06:57:48.671 INFO [stderr] warning: function is never used: `no_dangle`
Dec 02 06:57:48.671 INFO [stderr]    --> src/chapter3/bin/main.rs:149:1
Dec 02 06:57:48.671 INFO [stderr]     |
Dec 02 06:57:48.671 INFO [stderr] 149 | fn no_dangle() -> String {
Dec 02 06:57:48.671 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:48.671 INFO [stderr] 
Dec 02 06:57:48.671 INFO [stderr] warning: function is never used: `build_user`
Dec 02 06:57:48.671 INFO [stderr]    --> src/chapter3/bin/main.rs:187:1
Dec 02 06:57:48.671 INFO [stderr]     |
Dec 02 06:57:48.671 INFO [stderr] 187 | fn build_user(email: String, username: String) -> User {
Dec 02 06:57:48.671 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:48.671 INFO [stderr] 
Dec 02 06:57:49.284 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.22s
Dec 02 06:57:49.297 INFO [stderr] su: No module specific data is present
Dec 02 06:57:50.464 INFO running `"docker" "inspect" "f480bc8c12248570fd4979f288e30497b55912f6e7a49c619aa3c706d21a04b4"`
Dec 02 06:57:50.699 INFO running `"docker" "rm" "-f" "f480bc8c12248570fd4979f288e30497b55912f6e7a49c619aa3c706d21a04b4"`
Dec 02 06:57:50.921 INFO [stdout] f480bc8c12248570fd4979f288e30497b55912f6e7a49c619aa3c706d21a04b4
Dec 02 06:57:50.923 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-3/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 02 06:57:51.226 INFO [stdout] e7bef226fb0a1312eb8f72525da82733ede377fd0b131fe3c4d3e884e972b01e
Dec 02 06:57:51.228 INFO running `"docker" "start" "-a" "e7bef226fb0a1312eb8f72525da82733ede377fd0b131fe3c4d3e884e972b01e"`
Dec 02 06:57:51.871 INFO [stderr] usermod: no changes
Dec 02 06:57:51.911 INFO [stderr]    Compiling rusty-train v0.1.0 (/source)
Dec 02 06:57:52.667 INFO [stderr] warning: unused variable: `black`
Dec 02 06:57:52.667 INFO [stderr]   --> src/chapter5/bin/main.rs:23:9
Dec 02 06:57:52.667 INFO [stderr]    |
Dec 02 06:57:52.667 INFO [stderr] 23 |     let black = Color(0, 0, 0);
Dec 02 06:57:52.667 INFO [stderr]    |         ^^^^^ help: consider using `_black` instead
Dec 02 06:57:52.667 INFO [stderr]    |
Dec 02 06:57:52.667 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 02 06:57:52.667 INFO [stderr] 
Dec 02 06:57:52.667 INFO [stderr] warning: unused variable: `origin`
Dec 02 06:57:52.667 INFO [stderr]   --> src/chapter5/bin/main.rs:24:9
Dec 02 06:57:52.667 INFO [stderr]    |
Dec 02 06:57:52.667 INFO [stderr] 24 |     let origin = Point(0, 0, 0);
Dec 02 06:57:52.667 INFO [stderr]    |         ^^^^^^ help: consider using `_origin` instead
Dec 02 06:57:52.667 INFO [stderr] 
Dec 02 06:57:52.682 INFO [stderr] warning: function is never used: `build_user`
Dec 02 06:57:52.682 INFO [stderr]    --> src/chapter5/bin/main.rs:103:1
Dec 02 06:57:52.682 INFO [stderr]     |
Dec 02 06:57:52.682 INFO [stderr] 103 | fn build_user(email: String, username: String) -> User {
Dec 02 06:57:52.683 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:52.699 INFO [stderr]     |
Dec 02 06:57:52.699 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 02 06:57:52.699 INFO [stderr] 
Dec 02 06:57:52.835 INFO [stderr] warning: unused variable: `t`
Dec 02 06:57:52.835 INFO [stderr]   --> src/traits/bin/main.rs:83:24
Dec 02 06:57:52.835 INFO [stderr]    |
Dec 02 06:57:52.836 INFO [stderr] 83 | fn some_function<T, U>(t: T, u: U) -> i32
Dec 02 06:57:52.836 INFO [stderr]    |                        ^ help: consider using `_t` instead
Dec 02 06:57:52.843 INFO [stderr]    |
Dec 02 06:57:52.843 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 02 06:57:52.843 INFO [stderr] 
Dec 02 06:57:52.844 INFO [stderr] warning: unused variable: `u`
Dec 02 06:57:52.844 INFO [stderr]   --> src/traits/bin/main.rs:83:30
Dec 02 06:57:52.844 INFO [stderr]    |
Dec 02 06:57:52.844 INFO [stderr] 83 | fn some_function<T, U>(t: T, u: U) -> i32
Dec 02 06:57:52.845 INFO [stderr]    |                              ^ help: consider using `_u` instead
Dec 02 06:57:52.845 INFO [stderr] 
Dec 02 06:57:52.849 INFO [stderr] warning: unused imports: `Red`, `Yellow`
Dec 02 06:57:52.849 INFO [stderr]  --> src/chapter7/bin/main.rs:3:34
Dec 02 06:57:52.849 INFO [stderr]   |
Dec 02 06:57:52.849 INFO [stderr] 3 | use communicator::TrafficLight::{Red, Yellow};
Dec 02 06:57:52.849 INFO [stderr]   |                                  ^^^  ^^^^^^
Dec 02 06:57:52.867 INFO [stderr]   |
Dec 02 06:57:52.867 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 02 06:57:52.867 INFO [stderr] 
Dec 02 06:57:52.875 INFO [stderr] warning: function is never used: `some_function`
Dec 02 06:57:52.875 INFO [stderr]   --> src/traits/bin/main.rs:83:1
Dec 02 06:57:52.875 INFO [stderr]    |
Dec 02 06:57:52.875 INFO [stderr] 83 | / fn some_function<T, U>(t: T, u: U) -> i32
Dec 02 06:57:52.875 INFO [stderr] 84 | |     where T: std::fmt::Display + Clone,
Dec 02 06:57:52.875 INFO [stderr] 85 | |           U: Clone + std::fmt::Debug {
Dec 02 06:57:52.875 INFO [stderr] 86 | |     1
Dec 02 06:57:52.875 INFO [stderr] 87 | | }
Dec 02 06:57:52.875 INFO [stderr]    | |_^
Dec 02 06:57:52.875 INFO [stderr]    |
Dec 02 06:57:52.875 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:52.875 INFO [stderr] 
Dec 02 06:57:52.875 INFO [stderr] warning: struct is never constructed: `Pair`
Dec 02 06:57:52.875 INFO [stderr]   --> src/traits/bin/main.rs:92:1
Dec 02 06:57:52.875 INFO [stderr]    |
Dec 02 06:57:52.875 INFO [stderr] 92 | struct Pair<T> {
Dec 02 06:57:52.875 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 02 06:57:52.875 INFO [stderr] 
Dec 02 06:57:52.875 INFO [stderr] warning: method is never used: `new`
Dec 02 06:57:52.875 INFO [stderr]   --> src/traits/bin/main.rs:98:5
Dec 02 06:57:52.875 INFO [stderr]    |
Dec 02 06:57:52.875 INFO [stderr] 98 |     fn new(x: T, y: T) -> Self {
Dec 02 06:57:52.875 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:52.875 INFO [stderr] 
Dec 02 06:57:52.875 INFO [stderr] warning: method is never used: `cmp_display`
Dec 02 06:57:52.875 INFO [stderr]    --> src/traits/bin/main.rs:107:5
Dec 02 06:57:52.875 INFO [stderr]     |
Dec 02 06:57:52.875 INFO [stderr] 107 |     fn cmp_display(&self) {
Dec 02 06:57:52.875 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:52.875 INFO [stderr] 
Dec 02 06:57:52.893 INFO [stderr] warning: unused variable: `red`
Dec 02 06:57:52.894 INFO [stderr]  --> src/chapter7/bin/main.rs:8:9
Dec 02 06:57:52.894 INFO [stderr]   |
Dec 02 06:57:52.894 INFO [stderr] 8 |     let red = Red;
Dec 02 06:57:52.895 INFO [stderr]   |         ^^^ help: consider using `_red` instead
Dec 02 06:57:52.895 INFO [stderr]   |
Dec 02 06:57:52.895 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:52.895 INFO [stderr] 
Dec 02 06:57:52.895 INFO [stderr] warning: unused variable: `yellow`
Dec 02 06:57:52.895 INFO [stderr]  --> src/chapter7/bin/main.rs:9:9
Dec 02 06:57:52.895 INFO [stderr]   |
Dec 02 06:57:52.895 INFO [stderr] 9 |     let yellow = Yellow;
Dec 02 06:57:52.896 INFO [stderr]   |         ^^^^^^ help: consider using `_yellow` instead
Dec 02 06:57:52.896 INFO [stderr] 
Dec 02 06:57:52.896 INFO [stderr] warning: unused variable: `green`
Dec 02 06:57:52.896 INFO [stderr]   --> src/chapter7/bin/main.rs:10:9
Dec 02 06:57:52.896 INFO [stderr]    |
Dec 02 06:57:52.896 INFO [stderr] 10 |     let green = communicator::TrafficLight::Green;
Dec 02 06:57:52.896 INFO [stderr]    |         ^^^^^ help: consider using `_green` instead
Dec 02 06:57:52.896 INFO [stderr] 
Dec 02 06:57:52.896 INFO [stderr] warning: unused variable: `green`
Dec 02 06:57:52.896 INFO [stderr]   --> src/chapter7/bin/main.rs:14:9
Dec 02 06:57:52.896 INFO [stderr]    |
Dec 02 06:57:52.896 INFO [stderr] 14 |     let green = Green;
Dec 02 06:57:52.896 INFO [stderr]    |         ^^^^^ help: consider using `_green` instead
Dec 02 06:57:52.896 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `ip_type`
Dec 02 06:57:53.982 INFO [stderr]  --> src/chapter6/bin/main.rs:1:10
Dec 02 06:57:53.982 INFO [stderr]   |
Dec 02 06:57:53.982 INFO [stderr] 1 | fn route(ip_type: IpAddrKind) { }
Dec 02 06:57:53.982 INFO [stderr]   |          ^^^^^^^ help: consider using `_ip_type` instead
Dec 02 06:57:53.982 INFO [stderr]   |
Dec 02 06:57:53.982 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `x`
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:32:35
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 32 |     let x = some_string.and_then(|x: &str| Some("sf"));
Dec 02 06:57:53.982 INFO [stderr]    |                                   ^ help: consider using `_x` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `six`
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:11:9
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 11 |     let six = IpAddrKind::V6;
Dec 02 06:57:53.982 INFO [stderr]    |         ^^^ help: consider using `_six` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `home`
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:18:9
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 18 |     let home = IpAddr::V4(String::from("127.0.0.1"));
Dec 02 06:57:53.982 INFO [stderr]    |         ^^^^ help: consider using `_home` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `loopback`
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:19:9
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 19 |     let loopback = IpAddr::V6(String::from("::1"));
Dec 02 06:57:53.982 INFO [stderr]    |         ^^^^^^^^ help: consider using `_loopback` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `home`
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:21:9
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 21 |     let home = IpAddr2::V4(127, 0, 0, 1);
Dec 02 06:57:53.982 INFO [stderr]    |         ^^^^ help: consider using `_home` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: unused variable: `loopback`
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:22:9
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 22 |     let loopback = IpAddr2::V6(String::from("::1"));
Dec 02 06:57:53.982 INFO [stderr]    |         ^^^^^^^^ help: consider using `_loopback` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: variable `count` is assigned to, but never used
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:72:13
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 72 |     let mut count = 0;
Dec 02 06:57:53.982 INFO [stderr]    |             ^^^^^
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr]    = note: consider using `_count` instead
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.982 INFO [stderr] warning: value assigned to `count` is never read
Dec 02 06:57:53.982 INFO [stderr]   --> src/chapter6/bin/main.rs:76:9
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr] 76 |         count += 1;
Dec 02 06:57:53.982 INFO [stderr]    |         ^^^^^
Dec 02 06:57:53.982 INFO [stderr]    |
Dec 02 06:57:53.982 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 02 06:57:53.982 INFO [stderr] 
Dec 02 06:57:53.999 INFO [stderr] warning: variant is never constructed: `Quit`
Dec 02 06:57:53.999 INFO [stderr]   --> src/chapter6/bin/main.rs:94:5
Dec 02 06:57:53.999 INFO [stderr]    |
Dec 02 06:57:53.999 INFO [stderr] 94 |     Quit,
Dec 02 06:57:53.999 INFO [stderr]    |     ^^^^
Dec 02 06:57:54.007 INFO [stderr]    |
Dec 02 06:57:54.007 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:54.007 INFO [stderr] 
Dec 02 06:57:54.007 INFO [stderr] warning: variant is never constructed: `Move`
Dec 02 06:57:54.007 INFO [stderr]   --> src/chapter6/bin/main.rs:95:5
Dec 02 06:57:54.007 INFO [stderr]    |
Dec 02 06:57:54.007 INFO [stderr] 95 |     Move { x: i32, y: i32 },
Dec 02 06:57:54.007 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.007 INFO [stderr] 
Dec 02 06:57:54.007 INFO [stderr] warning: variant is never constructed: `ChangeColor`
Dec 02 06:57:54.007 INFO [stderr]   --> src/chapter6/bin/main.rs:97:5
Dec 02 06:57:54.007 INFO [stderr]    |
Dec 02 06:57:54.007 INFO [stderr] 97 |     ChangeColor(i32, i32, i32),
Dec 02 06:57:54.007 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.010 INFO [stderr] 
Dec 02 06:57:54.010 INFO [stderr] warning: variant is never constructed: `Alaska`
Dec 02 06:57:54.010 INFO [stderr]    --> src/chapter6/bin/main.rs:115:5
Dec 02 06:57:54.010 INFO [stderr]     |
Dec 02 06:57:54.010 INFO [stderr] 115 |     Alaska,
Dec 02 06:57:54.010 INFO [stderr]     |     ^^^^^^
Dec 02 06:57:54.010 INFO [stderr] 
Dec 02 06:57:54.010 INFO [stderr] warning: variant is never constructed: `Nickel`
Dec 02 06:57:54.010 INFO [stderr]    --> src/chapter6/bin/main.rs:121:5
Dec 02 06:57:54.010 INFO [stderr]     |
Dec 02 06:57:54.010 INFO [stderr] 121 |     Nickel,
Dec 02 06:57:54.010 INFO [stderr]     |     ^^^^^^
Dec 02 06:57:54.010 INFO [stderr] 
Dec 02 06:57:54.035 INFO [stderr] warning: unused variable: `black`
Dec 02 06:57:54.035 INFO [stderr]    --> src/chapter3/bin/main.rs:107:9
Dec 02 06:57:54.035 INFO [stderr]     |
Dec 02 06:57:54.035 INFO [stderr] 107 |     let black = Color(0, 0, 0);
Dec 02 06:57:54.035 INFO [stderr]     |         ^^^^^ help: consider using `_black` instead
Dec 02 06:57:54.063 INFO [stderr]     |
Dec 02 06:57:54.063 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 02 06:57:54.063 INFO [stderr] 
Dec 02 06:57:54.063 INFO [stderr] warning: unused variable: `origin`
Dec 02 06:57:54.063 INFO [stderr]    --> src/chapter3/bin/main.rs:108:9
Dec 02 06:57:54.063 INFO [stderr]     |
Dec 02 06:57:54.063 INFO [stderr] 108 |     let origin = Point(0, 0, 0);
Dec 02 06:57:54.063 INFO [stderr]     |         ^^^^^^ help: consider using `_origin` instead
Dec 02 06:57:54.063 INFO [stderr] 
Dec 02 06:57:54.075 INFO [stderr] warning: unused variable: `v`
Dec 02 06:57:54.075 INFO [stderr]  --> src/errors/bin/main.rs:5:9
Dec 02 06:57:54.075 INFO [stderr]   |
Dec 02 06:57:54.075 INFO [stderr] 5 |     let v = vec![1, 2, 3];
Dec 02 06:57:54.075 INFO [stderr]   |         ^ help: consider using `_v` instead
Dec 02 06:57:54.075 INFO [stderr]   |
Dec 02 06:57:54.075 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:54.075 INFO [stderr] 
Dec 02 06:57:54.075 INFO [stderr] warning: unused variable: `f`
Dec 02 06:57:54.075 INFO [stderr]   --> src/errors/bin/main.rs:23:9
Dec 02 06:57:54.075 INFO [stderr]    |
Dec 02 06:57:54.075 INFO [stderr] 23 |     let f = match f {
Dec 02 06:57:54.075 INFO [stderr]    |         ^ help: consider using `_f` instead
Dec 02 06:57:54.075 INFO [stderr] 
Dec 02 06:57:54.083 INFO [stderr] warning: function is never used: `middle_function`
Dec 02 06:57:54.083 INFO [stderr]  --> src/communicator/lib/mod.rs:6:5
Dec 02 06:57:54.083 INFO [stderr]   |
Dec 02 06:57:54.083 INFO [stderr] 6 |     pub fn middle_function() {
Dec 02 06:57:54.083 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.083 INFO [stderr]   |
Dec 02 06:57:54.083 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 02 06:57:54.083 INFO [stderr] 
Dec 02 06:57:54.083 INFO [stderr] warning: function is never used: `middle_secret_function`
Dec 02 06:57:54.083 INFO [stderr]   --> src/communicator/lib/mod.rs:10:5
Dec 02 06:57:54.083 INFO [stderr]    |
Dec 02 06:57:54.083 INFO [stderr] 10 |     fn middle_secret_function() {
Dec 02 06:57:54.083 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.083 INFO [stderr] 
Dec 02 06:57:54.083 INFO [stderr] warning: function is never used: `inner_function`
Dec 02 06:57:54.083 INFO [stderr]   --> src/communicator/lib/mod.rs:17:9
Dec 02 06:57:54.083 INFO [stderr]    |
Dec 02 06:57:54.083 INFO [stderr] 17 |         pub fn inner_function() {}
Dec 02 06:57:54.083 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.083 INFO [stderr] 
Dec 02 06:57:54.083 INFO [stderr] warning: function is never used: `secret_function`
Dec 02 06:57:54.083 INFO [stderr]   --> src/communicator/lib/mod.rs:19:9
Dec 02 06:57:54.083 INFO [stderr]    |
Dec 02 06:57:54.083 INFO [stderr] 19 |         fn secret_function() {
Dec 02 06:57:54.083 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.083 INFO [stderr] 
Dec 02 06:57:54.083 INFO [stderr] warning: function is never used: `inner_function`
Dec 02 06:57:54.083 INFO [stderr]   --> src/communicator/lib/mod.rs:26:13
Dec 02 06:57:54.083 INFO [stderr]    |
Dec 02 06:57:54.083 INFO [stderr] 26 |             pub fn inner_function() {
Dec 02 06:57:54.083 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.083 INFO [stderr] 
Dec 02 06:57:54.083 INFO [stderr] warning: function is never used: `try_me`
Dec 02 06:57:54.083 INFO [stderr]   --> src/communicator/lib/mod.rs:56:1
Dec 02 06:57:54.083 INFO [stderr]    |
Dec 02 06:57:54.083 INFO [stderr] 56 | fn try_me() {
Dec 02 06:57:54.083 INFO [stderr]    | ^^^^^^^^^^^
Dec 02 06:57:54.083 INFO [stderr] 
Dec 02 06:57:54.131 INFO [stderr] warning: function is never used: `read_username_from_file`
Dec 02 06:57:54.131 INFO [stderr]   --> src/errors/bin/main.rs:44:1
Dec 02 06:57:54.131 INFO [stderr]    |
Dec 02 06:57:54.131 INFO [stderr] 44 | fn read_username_from_file() -> Result<String, io::Error> {
Dec 02 06:57:54.131 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.131 INFO [stderr]    |
Dec 02 06:57:54.131 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:54.131 INFO [stderr] 
Dec 02 06:57:54.131 INFO [stderr] warning: function is never used: `read_username_from_file2`
Dec 02 06:57:54.131 INFO [stderr]   --> src/errors/bin/main.rs:60:1
Dec 02 06:57:54.131 INFO [stderr]    |
Dec 02 06:57:54.131 INFO [stderr] 60 | fn read_username_from_file2() -> Result<String, io::Error> {
Dec 02 06:57:54.131 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.131 INFO [stderr] 
Dec 02 06:57:54.158 INFO [stderr] warning: function is never used: `gives_ownership`
Dec 02 06:57:54.158 INFO [stderr]    --> src/chapter3/bin/main.rs:119:1
Dec 02 06:57:54.158 INFO [stderr]     |
Dec 02 06:57:54.158 INFO [stderr] 119 | fn gives_ownership() -> String {
Dec 02 06:57:54.158 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.167 INFO [stderr]     |
Dec 02 06:57:54.167 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 02 06:57:54.167 INFO [stderr] 
Dec 02 06:57:54.167 INFO [stderr] warning: function is never used: `takes_and_gives_back`
Dec 02 06:57:54.167 INFO [stderr]    --> src/chapter3/bin/main.rs:124:1
Dec 02 06:57:54.167 INFO [stderr]     |
Dec 02 06:57:54.167 INFO [stderr] 124 | fn takes_and_gives_back(a_string: String) -> String {
Dec 02 06:57:54.167 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.167 INFO [stderr] 
Dec 02 06:57:54.167 INFO [stderr] warning: function is never used: `no_dangle`
Dec 02 06:57:54.167 INFO [stderr]    --> src/chapter3/bin/main.rs:149:1
Dec 02 06:57:54.167 INFO [stderr]     |
Dec 02 06:57:54.167 INFO [stderr] 149 | fn no_dangle() -> String {
Dec 02 06:57:54.167 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.167 INFO [stderr] 
Dec 02 06:57:54.167 INFO [stderr] warning: function is never used: `build_user`
Dec 02 06:57:54.167 INFO [stderr]    --> src/chapter3/bin/main.rs:187:1
Dec 02 06:57:54.167 INFO [stderr]     |
Dec 02 06:57:54.167 INFO [stderr] 187 | fn build_user(email: String, username: String) -> User {
Dec 02 06:57:54.167 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:54.167 INFO [stderr] 
Dec 02 06:57:54.171 INFO [stderr] warning: function `openFile` should have a snake case name such as `open_file`
Dec 02 06:57:54.171 INFO [stderr]   --> src/errors/bin/main.rs:20:1
Dec 02 06:57:54.171 INFO [stderr]    |
Dec 02 06:57:54.171 INFO [stderr] 20 | / fn openFile() {
Dec 02 06:57:54.171 INFO [stderr] 21 | |     let f = File::open("hello.txt");
Dec 02 06:57:54.171 INFO [stderr] 22 | |
Dec 02 06:57:54.171 INFO [stderr] 23 | |     let f = match f {
Dec 02 06:57:54.171 INFO [stderr] ...  |
Dec 02 06:57:54.171 INFO [stderr] 40 | |     };
Dec 02 06:57:54.171 INFO [stderr] 41 | | }
Dec 02 06:57:54.171 INFO [stderr]    | |_^
Dec 02 06:57:54.171 INFO [stderr]    |
Dec 02 06:57:54.171 INFO [stderr]    = note: #[warn(non_snake_case)] on by default
Dec 02 06:57:54.171 INFO [stderr] 
Dec 02 06:57:55.619 INFO [stderr] warning: unused variable: `s`
Dec 02 06:57:55.619 INFO [stderr]  --> src/lifetimes/bin/main.rs:5:13
Dec 02 06:57:55.620 INFO [stderr]   |
Dec 02 06:57:55.620 INFO [stderr] 5 |         let s: &'static str = "asdsa";
Dec 02 06:57:55.620 INFO [stderr]   |             ^ help: consider using `_s` instead
Dec 02 06:57:55.621 INFO [stderr]   |
Dec 02 06:57:55.621 INFO [stderr]   = note: #[warn(unused_variables)] on by default
Dec 02 06:57:55.621 INFO [stderr] 
Dec 02 06:57:55.622 INFO [stderr] warning: unused variable: `y`
Dec 02 06:57:55.622 INFO [stderr]   --> src/lifetimes/bin/main.rs:40:29
Dec 02 06:57:55.622 INFO [stderr]    |
Dec 02 06:57:55.623 INFO [stderr] 40 | fn longest2<'a>(x: &'a str, y: &str) -> &'a str {
Dec 02 06:57:55.623 INFO [stderr]    |                             ^ help: consider using `_y` instead
Dec 02 06:57:55.623 INFO [stderr] 
Dec 02 06:57:55.624 INFO [stderr] warning: unused variable: `y`
Dec 02 06:57:55.624 INFO [stderr]   --> src/lifetimes/bin/main.rs:44:29
Dec 02 06:57:55.625 INFO [stderr]    |
Dec 02 06:57:55.625 INFO [stderr] 44 | fn longest3<'a>(x: &'a str, y: &str) -> &'a str {
Dec 02 06:57:55.625 INFO [stderr]    |                             ^ help: consider using `_y` instead
Dec 02 06:57:55.626 INFO [stderr] 
Dec 02 06:57:55.677 INFO [stderr] warning: function is never used: `longest3`
Dec 02 06:57:55.677 INFO [stderr]   --> src/lifetimes/bin/main.rs:44:1
Dec 02 06:57:55.677 INFO [stderr]    |
Dec 02 06:57:55.678 INFO [stderr] 44 | fn longest3<'a>(x: &'a str, y: &str) -> &'a str {
Dec 02 06:57:55.678 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:55.699 INFO [stderr]    |
Dec 02 06:57:55.699 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:55.699 INFO [stderr] 
Dec 02 06:57:55.699 INFO [stderr] warning: field is never used: `a`
Dec 02 06:57:55.699 INFO [stderr]   --> src/lifetimes/bin/main.rs:50:5
Dec 02 06:57:55.699 INFO [stderr]    |
Dec 02 06:57:55.699 INFO [stderr] 50 |     a: String,
Dec 02 06:57:55.699 INFO [stderr]    |     ^^^^^^^^^
Dec 02 06:57:55.699 INFO [stderr] 
Dec 02 06:57:55.700 INFO [stderr] warning: method is never used: `level`
Dec 02 06:57:55.700 INFO [stderr]   --> src/lifetimes/bin/main.rs:54:5
Dec 02 06:57:55.700 INFO [stderr]    |
Dec 02 06:57:55.700 INFO [stderr] 54 |     fn level(&self) -> i32 {
Dec 02 06:57:55.700 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:55.700 INFO [stderr] 
Dec 02 06:57:55.700 INFO [stderr] warning: method is never used: `a`
Dec 02 06:57:55.700 INFO [stderr]   --> src/lifetimes/bin/main.rs:60:5
Dec 02 06:57:55.700 INFO [stderr]    |
Dec 02 06:57:55.700 INFO [stderr] 60 |     fn a(&self) -> &str {
Dec 02 06:57:55.700 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:55.700 INFO [stderr] 
Dec 02 06:57:55.700 INFO [stderr] warning: function is never used: `longest_with_an_announcement`
Dec 02 06:57:55.700 INFO [stderr]   --> src/lifetimes/bin/main.rs:67:1
Dec 02 06:57:55.700 INFO [stderr]    |
Dec 02 06:57:55.700 INFO [stderr] 67 | / fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
Dec 02 06:57:55.700 INFO [stderr] 68 | |     where T: Display
Dec 02 06:57:55.700 INFO [stderr] 69 | | {
Dec 02 06:57:55.700 INFO [stderr] 70 | |     println!("Announcement! {}", ann);
Dec 02 06:57:55.700 INFO [stderr] ...  |
Dec 02 06:57:55.700 INFO [stderr] 75 | |     }
Dec 02 06:57:55.700 INFO [stderr] 76 | | }
Dec 02 06:57:55.700 INFO [stderr]    | |_^
Dec 02 06:57:55.700 INFO [stderr] 
Dec 02 06:57:56.903 INFO [stderr] warning: unnecessary parentheses around assigned value
Dec 02 06:57:56.903 INFO [stderr]    --> src/collections/bin/main.rs:181:14
Dec 02 06:57:56.903 INFO [stderr]     |
Dec 02 06:57:56.904 INFO [stderr] 181 |         t += (*i as f32);
Dec 02 06:57:56.904 INFO [stderr]     |              ^^^^^^^^^^^ help: remove these parentheses
Dec 02 06:57:56.904 INFO [stderr]     |
Dec 02 06:57:56.904 INFO [stderr]     = note: #[warn(unused_parens)] on by default
Dec 02 06:57:56.905 INFO [stderr] 
Dec 02 06:57:57.263 INFO [stderr] warning: unused variable: `s1`
Dec 02 06:57:57.263 INFO [stderr]   --> src/collections/bin/main.rs:99:9
Dec 02 06:57:57.263 INFO [stderr]    |
Dec 02 06:57:57.263 INFO [stderr] 99 |     let s1 = String::from("hello");
Dec 02 06:57:57.263 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 02 06:57:57.263 INFO [stderr]    |
Dec 02 06:57:57.263 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 02 06:57:57.263 INFO [stderr] 
Dec 02 06:57:57.263 INFO [stderr] warning: unused variable: `scores`
Dec 02 06:57:57.263 INFO [stderr]    --> src/collections/bin/main.rs:143:9
Dec 02 06:57:57.263 INFO [stderr]     |
Dec 02 06:57:57.263 INFO [stderr] 143 |     let scores: HashMap<_, _> = zipped.collect();
Dec 02 06:57:57.263 INFO [stderr]     |         ^^^^^^ help: consider using `_scores` instead
Dec 02 06:57:57.263 INFO [stderr] 
Dec 02 06:57:57.439 INFO [stderr] warning: variable does not need to be mutable
Dec 02 06:57:57.439 INFO [stderr]   --> src/collections/bin/main.rs:56:9
Dec 02 06:57:57.439 INFO [stderr]    |
Dec 02 06:57:57.439 INFO [stderr] 56 |     let mut s = String::new();
Dec 02 06:57:57.439 INFO [stderr]    |         ----^
Dec 02 06:57:57.439 INFO [stderr]    |         |
Dec 02 06:57:57.439 INFO [stderr]    |         help: remove this `mut`
Dec 02 06:57:57.439 INFO [stderr]    |
Dec 02 06:57:57.439 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 02 06:57:57.439 INFO [stderr] 
Dec 02 06:57:57.607 INFO [stderr] warning: function is never used: `max_ch`
Dec 02 06:57:57.607 INFO [stderr]   --> src/generics/bin/main.rs:51:1
Dec 02 06:57:57.607 INFO [stderr]    |
Dec 02 06:57:57.607 INFO [stderr] 51 | fn max_ch(list: &[char]) -> Option<char> {
Dec 02 06:57:57.607 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:57:57.607 INFO [stderr]    |
Dec 02 06:57:57.607 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 02 06:57:57.607 INFO [stderr] 
Dec 02 06:57:58.456 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.56s
Dec 02 06:57:58.463 INFO [stderr] su: No module specific data is present
Dec 02 06:57:59.192 INFO running `"docker" "inspect" "e7bef226fb0a1312eb8f72525da82733ede377fd0b131fe3c4d3e884e972b01e"`
Dec 02 06:57:59.623 INFO running `"docker" "rm" "-f" "e7bef226fb0a1312eb8f72525da82733ede377fd0b131fe3c4d3e884e972b01e"`
Dec 02 06:57:59.923 INFO [stdout] e7bef226fb0a1312eb8f72525da82733ede377fd0b131fe3c4d3e884e972b01e
Dec 02 06:57:59.929 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-3/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 02 06:58:00.451 INFO [stdout] 83313f6fd11fdbd860d23944e4fc9735b1c1bb3bc8116edfad03aedb7d76b92f
Dec 02 06:58:00.456 INFO running `"docker" "start" "-a" "83313f6fd11fdbd860d23944e4fc9735b1c1bb3bc8116edfad03aedb7d76b92f"`
Dec 02 06:58:01.564 INFO [stderr] usermod: no changes
Dec 02 06:58:01.635 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
Dec 02 06:58:01.651 INFO [stderr]      Running /target/debug/deps/communicator-0209d0672dd0ee08
Dec 02 06:58:01.664 INFO [stdout] 
Dec 02 06:58:01.664 INFO [stdout] running 9 tests
Dec 02 06:58:01.667 INFO [stdout] test tests::expensive_test ... ignored
Dec 02 06:58:01.667 INFO [stdout] test tests::add_three_and_two ... ok
Dec 02 06:58:01.667 INFO [stdout] test tests::this_test_will_pass ... ok
Dec 02 06:58:01.667 INFO [stdout] test tests::smaller_cannot_hold_larger ... ok
Dec 02 06:58:01.667 INFO [stdout] test tests::one_hundred ... ok
Dec 02 06:58:01.667 INFO [stdout] test tests::larger_can_hold_smaller ... ok
Dec 02 06:58:01.667 INFO [stdout] test tests::it_adds_two ... ok
Dec 02 06:58:01.667 INFO [stdout] test tests::exploration ... ok
Dec 02 06:58:01.675 INFO [stdout] test tests::add_two_and_two ... ok
Dec 02 06:58:01.675 INFO [stdout] 
Dec 02 06:58:01.675 INFO [stdout] test result: ok. 8 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.675 INFO [stdout] 
Dec 02 06:58:01.679 INFO [stderr]      Running /target/debug/deps/chapter3-b31bbde6ea6aface
Dec 02 06:58:01.687 INFO [stdout] 
Dec 02 06:58:01.687 INFO [stdout] running 0 tests
Dec 02 06:58:01.687 INFO [stdout] 
Dec 02 06:58:01.687 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.687 INFO [stdout] 
Dec 02 06:58:01.691 INFO [stderr]      Running /target/debug/deps/chapter5-454dabe07609c8e8
Dec 02 06:58:01.691 INFO [stderr]      Running /target/debug/deps/chapter6-a49a632d387f0305
Dec 02 06:58:01.691 INFO [stdout] 
Dec 02 06:58:01.691 INFO [stdout] running 0 tests
Dec 02 06:58:01.691 INFO [stdout] 
Dec 02 06:58:01.691 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.691 INFO [stdout] 
Dec 02 06:58:01.691 INFO [stderr]      Running /target/debug/deps/chapter7-0030da0ab9ed2630
Dec 02 06:58:01.691 INFO [stdout] 
Dec 02 06:58:01.691 INFO [stdout] running 0 tests
Dec 02 06:58:01.691 INFO [stdout] 
Dec 02 06:58:01.691 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.691 INFO [stdout] 
Dec 02 06:58:01.695 INFO [stdout] 
Dec 02 06:58:01.695 INFO [stdout] running 0 tests
Dec 02 06:58:01.695 INFO [stdout] 
Dec 02 06:58:01.695 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.695 INFO [stdout] 
Dec 02 06:58:01.695 INFO [stderr]      Running /target/debug/deps/collections-9832ec671381caec
Dec 02 06:58:01.711 INFO [stdout] 
Dec 02 06:58:01.711 INFO [stdout] running 0 tests
Dec 02 06:58:01.711 INFO [stdout] 
Dec 02 06:58:01.711 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.711 INFO [stdout] 
Dec 02 06:58:01.711 INFO [stderr]      Running /target/debug/deps/errors-40697f7b3d548582
Dec 02 06:58:01.714 INFO [stdout] 
Dec 02 06:58:01.714 INFO [stdout] running 0 tests
Dec 02 06:58:01.714 INFO [stdout] 
Dec 02 06:58:01.714 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.714 INFO [stdout] 
Dec 02 06:58:01.714 INFO [stderr]      Running /target/debug/deps/generics-2fd4b530726d1297
Dec 02 06:58:01.725 INFO [stdout] 
Dec 02 06:58:01.725 INFO [stdout] running 0 tests
Dec 02 06:58:01.725 INFO [stdout] 
Dec 02 06:58:01.725 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.725 INFO [stdout] 
Dec 02 06:58:01.725 INFO [stderr]      Running /target/debug/deps/lifetimes-3d77515894e12cb8
Dec 02 06:58:01.731 INFO [stdout] 
Dec 02 06:58:01.731 INFO [stdout] running 0 tests
Dec 02 06:58:01.731 INFO [stdout] 
Dec 02 06:58:01.731 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.731 INFO [stdout] 
Dec 02 06:58:01.732 INFO [stderr]      Running /target/debug/deps/minigrep-94dc0e12c1196e5a
Dec 02 06:58:01.736 INFO [stdout] 
Dec 02 06:58:01.736 INFO [stdout] running 0 tests
Dec 02 06:58:01.736 INFO [stdout] 
Dec 02 06:58:01.736 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.736 INFO [stdout] 
Dec 02 06:58:01.738 INFO [stderr]      Running /target/debug/deps/traits-a175d81ced8849d3
Dec 02 06:58:01.747 INFO [stderr]      Running /target/debug/deps/integration_test-b80fabc6b0d73e21
Dec 02 06:58:01.748 INFO [stdout] 
Dec 02 06:58:01.748 INFO [stdout] running 0 tests
Dec 02 06:58:01.748 INFO [stdout] 
Dec 02 06:58:01.748 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.748 INFO [stdout] 
Dec 02 06:58:01.748 INFO [stdout] 
Dec 02 06:58:01.748 INFO [stdout] running 1 test
Dec 02 06:58:01.759 INFO [stderr]    Doc-tests communicator
Dec 02 06:58:01.759 INFO [stdout] test it_adds_two_ingrt ... ok
Dec 02 06:58:01.759 INFO [stdout] 
Dec 02 06:58:01.759 INFO [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:01.759 INFO [stdout] 
Dec 02 06:58:02.535 INFO [stdout] 
Dec 02 06:58:02.535 INFO [stdout] running 0 tests
Dec 02 06:58:02.535 INFO [stdout] 
Dec 02 06:58:02.535 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 02 06:58:02.535 INFO [stdout] 
Dec 02 06:58:02.542 INFO [stderr] su: No module specific data is present
Dec 02 06:58:03.285 INFO running `"docker" "inspect" "83313f6fd11fdbd860d23944e4fc9735b1c1bb3bc8116edfad03aedb7d76b92f"`
Dec 02 06:58:03.561 INFO running `"docker" "rm" "-f" "83313f6fd11fdbd860d23944e4fc9735b1c1bb3bc8116edfad03aedb7d76b92f"`
Dec 02 06:58:03.819 INFO [stdout] 83313f6fd11fdbd860d23944e4fc9735b1c1bb3bc8116edfad03aedb7d76b92f
