Dec 13 23:43:53.672 INFO testing chrisp9/rust_exploration against try#aa49d8ef14939ddec0e34b346b60174a5673d48f for pr-56550
Dec 13 23:43:53.672 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-3/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 23:43:54.146 INFO [stdout] 82ce8974a91ffc8f4bfc3662225d5d2b2fcd0b058cd332afd8577dfbb511427f
Dec 13 23:43:54.149 INFO running `"docker" "start" "-a" "82ce8974a91ffc8f4bfc3662225d5d2b2fcd0b058cd332afd8577dfbb511427f"`
Dec 13 23:43:54.907 INFO [stderr] usermod: no changes
Dec 13 23:43:55.007 INFO [stderr]    Compiling rust_exploration v0.1.0 (/source)
Dec 13 23:43:55.650 INFO [stderr] warning: unused variable: `num`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:177:45
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 177 |     let mut expensive_result = Cacher::new(|num| {
Dec 13 23:43:55.651 INFO [stderr]     |                                             ^^^ help: consider using `_num` instead
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `equal_to_x`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:212:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 212 |     let equal_to_x = |z : u32| z == x;
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^^^^^^ help: consider using `_equal_to_x` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `y`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:213:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 213 |     let y = 4;
Dec 13 23:43:55.651 INFO [stderr]     |         ^ help: consider using `_y` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `res`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:229:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 229 |     let res: Vec<_> = v1.iter().map(|x| x + 1).collect();
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^ help: consider using `_res` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `total`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:236:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 236 |     let total: i32 = v1_iter.sum();
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^ help: consider using `_total` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `item`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:289:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 289 |     let item = map.get(&key).unwrap();
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^ help: consider using `_item` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `s3`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:296:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 296 |     let s3 = s1 + &s2;
Dec 13 23:43:55.651 INFO [stderr]     |         ^^ help: consider using `_s3` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `v`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:306:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 306 |     let v: Vec<i32> = Vec::new();
Dec 13 23:43:55.651 INFO [stderr]     |         ^ help: consider using `_v` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `third`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:309:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 309 |     let third: &i32 = &v[2];
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^ help: consider using `_third` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `some_number`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:372:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 372 |     let some_number = Some(5);
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_number` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `some_string`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:373:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 373 |     let some_string = Some("A string");
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_string` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `absent_number`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:375:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 375 |     let absent_number : Option<i32> = None;
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^^^^^^^^^ help: consider using `_absent_number` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.651 INFO [stderr] warning: unused variable: `rect3`
Dec 13 23:43:55.651 INFO [stderr]    --> src/main.rs:387:9
Dec 13 23:43:55.651 INFO [stderr]     |
Dec 13 23:43:55.651 INFO [stderr] 387 |     let rect3 = Rectangle {width: 60, height: 45};
Dec 13 23:43:55.651 INFO [stderr]     |         ^^^^^ help: consider using `_rect3` instead
Dec 13 23:43:55.651 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: struct is never constructed: `NewsArticle`
Dec 13 23:43:55.696 INFO [stderr]  --> src/news_aggregator/mod.rs:5:5
Dec 13 23:43:55.696 INFO [stderr]   |
Dec 13 23:43:55.696 INFO [stderr] 5 |     pub struct NewsArticle {
Dec 13 23:43:55.696 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr]   |
Dec 13 23:43:55.696 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: struct is never constructed: `Tweet`
Dec 13 23:43:55.696 INFO [stderr]   --> src/news_aggregator/mod.rs:18:5
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.696 INFO [stderr] 18 |     pub struct Tweet {
Dec 13 23:43:55.696 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: struct is never constructed: `Pair`
Dec 13 23:43:55.696 INFO [stderr]   --> src/main.rs:18:1
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.696 INFO [stderr] 18 | struct Pair<T> {
Dec 13 23:43:55.696 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: method is never used: `new`
Dec 13 23:43:55.696 INFO [stderr]   --> src/main.rs:24:5
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.696 INFO [stderr] 24 |     fn new(x: T, y: T) -> Self {
Dec 13 23:43:55.696 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: method is never used: `cmp_display`
Dec 13 23:43:55.696 INFO [stderr]   --> src/main.rs:33:5
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.696 INFO [stderr] 33 |     fn cmp_display(&self) {
Dec 13 23:43:55.696 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: struct is never constructed: `User`
Dec 13 23:43:55.696 INFO [stderr]   --> src/main.rs:42:1
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.696 INFO [stderr] 42 | struct User {
Dec 13 23:43:55.696 INFO [stderr]    | ^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: struct is never constructed: `Rectangle`
Dec 13 23:43:55.696 INFO [stderr]   --> src/main.rs:49:1
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.696 INFO [stderr] 49 | struct Rectangle {
Dec 13 23:43:55.696 INFO [stderr]    | ^^^^^^^^^^^^^^^^
Dec 13 23:43:55.696 INFO [stderr] 
Dec 13 23:43:55.696 INFO [stderr] warning: method is never used: `area`
Dec 13 23:43:55.696 INFO [stderr]   --> src/main.rs:55:5
Dec 13 23:43:55.696 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 55 |     fn area(&self) -> u32 {
Dec 13 23:43:55.697 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: method is never used: `can_hold`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:59:5
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 59 |     fn can_hold(&self, other: &Rectangle) -> bool {
Dec 13 23:43:55.697 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: method is never used: `square`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:63:5
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 63 |     fn square(size: u32) -> Rectangle {
Dec 13 23:43:55.697 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: enum is never used: `IpAddrKind`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:68:1
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 68 | enum IpAddrKind {
Dec 13 23:43:55.697 INFO [stderr]    | ^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: enum is never used: `UsState`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:74:1
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 74 | enum UsState {
Dec 13 23:43:55.697 INFO [stderr]    | ^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: enum is never used: `Coin`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:80:1
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 80 | enum Coin {
Dec 13 23:43:55.697 INFO [stderr]    | ^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: enum is never used: `Message`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:87:1
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 87 | enum Message {
Dec 13 23:43:55.697 INFO [stderr]    | ^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: method is never used: `call`
Dec 13 23:43:55.697 INFO [stderr]   --> src/main.rs:95:5
Dec 13 23:43:55.697 INFO [stderr]    |
Dec 13 23:43:55.697 INFO [stderr] 95 |     fn call(&self) {
Dec 13 23:43:55.697 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `largest`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:100:2
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 100 |  fn largest<T : PartialOrd>(list: &[T]) -> &T {
Dec 13 23:43:55.697 INFO [stderr]     |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: struct is never constructed: `Point`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:112:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 112 | struct Point<T> {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `shoes_in_my_size`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:123:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 123 | fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `simulated_expensive_calculation`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:204:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 204 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `closure_capturing_context`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:210:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 210 | fn closure_capturing_context() {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `iterators`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:217:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 217 | fn iterators() {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `iterator_map`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:226:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 226 | fn iterator_map() {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.697 INFO [stderr] warning: function is never used: `iterator_sum`
Dec 13 23:43:55.697 INFO [stderr]    --> src/main.rs:232:1
Dec 13 23:43:55.697 INFO [stderr]     |
Dec 13 23:43:55.697 INFO [stderr] 232 | fn iterator_sum() {
Dec 13 23:43:55.697 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.697 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `news_aggregate`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:269:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 269 | fn news_aggregate() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `vector`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:305:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 305 | fn vector() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: struct is never constructed: `Counter`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:325:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 325 | struct Counter {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: method is never used: `new`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:330:5
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 330 |     fn new() -> Counter {
Dec 13 23:43:55.698 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `if_let`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:351:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 351 | fn if_let() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `value_in_cents`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:359:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 359 | fn value_in_cents(coin : Coin) -> u32 {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `option`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:371:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 371 | fn option() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `messages`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:378:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 378 | fn messages() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `rectangles`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:383:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 383 | fn rectangles() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `build_user`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:395:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 395 | fn build_user(email: String, username: String) -> User {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `coins`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:404:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 404 | fn coins() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `slices`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:409:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 409 | fn slices() {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `takes_ownership`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:419:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 419 | fn takes_ownership(some_string: String) {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.698 INFO [stderr] warning: function is never used: `makes_copy`
Dec 13 23:43:55.698 INFO [stderr]    --> src/main.rs:423:1
Dec 13 23:43:55.698 INFO [stderr]     |
Dec 13 23:43:55.698 INFO [stderr] 423 | fn makes_copy(some_integer: i32) {
Dec 13 23:43:55.698 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.698 INFO [stderr] 
Dec 13 23:43:55.703 INFO [stderr] warning: function is never used: `first_word`
Dec 13 23:43:55.703 INFO [stderr]    --> src/main.rs:427:1
Dec 13 23:43:55.703 INFO [stderr]     |
Dec 13 23:43:55.703 INFO [stderr] 427 | fn first_word(s: &String) -> usize {
Dec 13 23:43:55.703 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.703 INFO [stderr] 
Dec 13 23:43:55.703 INFO [stderr] warning: function is never used: `guess_number`
Dec 13 23:43:55.703 INFO [stderr]    --> src/main.rs:440:1
Dec 13 23:43:55.703 INFO [stderr]     |
Dec 13 23:43:55.703 INFO [stderr] 440 | fn guess_number() {
Dec 13 23:43:55.703 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.703 INFO [stderr] 
Dec 13 23:43:55.703 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 23:43:55.703 INFO [stderr]    --> src/main.rs:245:5
Dec 13 23:43:55.703 INFO [stderr]     |
Dec 13 23:43:55.703 INFO [stderr] 245 |     read_username_from_file();
Dec 13 23:43:55.703 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:43:55.703 INFO [stderr]     |
Dec 13 23:43:55.703 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 13 23:43:55.703 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 23:43:55.703 INFO [stderr] 
Dec 13 23:43:56.615 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.67s
Dec 13 23:43:56.615 INFO [stderr] su: No module specific data is present
Dec 13 23:43:57.339 INFO running `"docker" "inspect" "82ce8974a91ffc8f4bfc3662225d5d2b2fcd0b058cd332afd8577dfbb511427f"`
Dec 13 23:43:57.805 INFO running `"docker" "rm" "-f" "82ce8974a91ffc8f4bfc3662225d5d2b2fcd0b058cd332afd8577dfbb511427f"`
Dec 13 23:43:58.090 INFO [stdout] 82ce8974a91ffc8f4bfc3662225d5d2b2fcd0b058cd332afd8577dfbb511427f
Dec 13 23:43:58.099 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-3/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 23:43:58.629 INFO [stdout] 3a32604be53c96519db80940895eb32142b0d5dd02359e5d3bc45bc6440c6086
Dec 13 23:43:58.629 INFO running `"docker" "start" "-a" "3a32604be53c96519db80940895eb32142b0d5dd02359e5d3bc45bc6440c6086"`
Dec 13 23:43:59.694 INFO [stderr] usermod: no changes
Dec 13 23:43:59.791 INFO [stderr]    Compiling rust_exploration v0.1.0 (/source)
Dec 13 23:44:00.399 INFO [stderr] warning: unused variable: `num`
Dec 13 23:44:00.399 INFO [stderr]    --> src/main.rs:177:45
Dec 13 23:44:00.399 INFO [stderr]     |
Dec 13 23:44:00.399 INFO [stderr] 177 |     let mut expensive_result = Cacher::new(|num| {
Dec 13 23:44:00.399 INFO [stderr]     |                                             ^^^ help: consider using `_num` instead
Dec 13 23:44:00.399 INFO [stderr]     |
Dec 13 23:44:00.399 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 13 23:44:00.399 INFO [stderr] 
Dec 13 23:44:00.399 INFO [stderr] warning: unused variable: `equal_to_x`
Dec 13 23:44:00.399 INFO [stderr]    --> src/main.rs:212:9
Dec 13 23:44:00.399 INFO [stderr]     |
Dec 13 23:44:00.399 INFO [stderr] 212 |     let equal_to_x = |z : u32| z == x;
Dec 13 23:44:00.399 INFO [stderr]     |         ^^^^^^^^^^ help: consider using `_equal_to_x` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `y`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:213:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 213 |     let y = 4;
Dec 13 23:44:00.400 INFO [stderr]     |         ^ help: consider using `_y` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `res`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:229:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 229 |     let res: Vec<_> = v1.iter().map(|x| x + 1).collect();
Dec 13 23:44:00.400 INFO [stderr]     |         ^^^ help: consider using `_res` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `total`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:236:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 236 |     let total: i32 = v1_iter.sum();
Dec 13 23:44:00.400 INFO [stderr]     |         ^^^^^ help: consider using `_total` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `item`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:289:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 289 |     let item = map.get(&key).unwrap();
Dec 13 23:44:00.400 INFO [stderr]     |         ^^^^ help: consider using `_item` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `s3`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:296:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 296 |     let s3 = s1 + &s2;
Dec 13 23:44:00.400 INFO [stderr]     |         ^^ help: consider using `_s3` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `v`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:306:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 306 |     let v: Vec<i32> = Vec::new();
Dec 13 23:44:00.400 INFO [stderr]     |         ^ help: consider using `_v` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `third`
Dec 13 23:44:00.400 INFO [stderr]    --> src/main.rs:309:9
Dec 13 23:44:00.400 INFO [stderr]     |
Dec 13 23:44:00.400 INFO [stderr] 309 |     let third: &i32 = &v[2];
Dec 13 23:44:00.400 INFO [stderr]     |         ^^^^^ help: consider using `_third` instead
Dec 13 23:44:00.400 INFO [stderr] 
Dec 13 23:44:00.400 INFO [stderr] warning: unused variable: `some_number`
Dec 13 23:44:00.401 INFO [stderr]    --> src/main.rs:372:9
Dec 13 23:44:00.401 INFO [stderr]     |
Dec 13 23:44:00.401 INFO [stderr] 372 |     let some_number = Some(5);
Dec 13 23:44:00.401 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_number` instead
Dec 13 23:44:00.401 INFO [stderr] 
Dec 13 23:44:00.401 INFO [stderr] warning: unused variable: `some_string`
Dec 13 23:44:00.401 INFO [stderr]    --> src/main.rs:373:9
Dec 13 23:44:00.401 INFO [stderr]     |
Dec 13 23:44:00.401 INFO [stderr] 373 |     let some_string = Some("A string");
Dec 13 23:44:00.401 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_string` instead
Dec 13 23:44:00.401 INFO [stderr] 
Dec 13 23:44:00.401 INFO [stderr] warning: unused variable: `absent_number`
Dec 13 23:44:00.401 INFO [stderr]    --> src/main.rs:375:9
Dec 13 23:44:00.401 INFO [stderr]     |
Dec 13 23:44:00.401 INFO [stderr] 375 |     let absent_number : Option<i32> = None;
Dec 13 23:44:00.401 INFO [stderr]     |         ^^^^^^^^^^^^^ help: consider using `_absent_number` instead
Dec 13 23:44:00.401 INFO [stderr] 
Dec 13 23:44:00.401 INFO [stderr] warning: unused variable: `rect3`
Dec 13 23:44:00.401 INFO [stderr]    --> src/main.rs:387:9
Dec 13 23:44:00.401 INFO [stderr]     |
Dec 13 23:44:00.401 INFO [stderr] 387 |     let rect3 = Rectangle {width: 60, height: 45};
Dec 13 23:44:00.401 INFO [stderr]     |         ^^^^^ help: consider using `_rect3` instead
Dec 13 23:44:00.401 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: struct is never constructed: `NewsArticle`
Dec 13 23:44:00.450 INFO [stderr]  --> src/news_aggregator/mod.rs:5:5
Dec 13 23:44:00.450 INFO [stderr]   |
Dec 13 23:44:00.450 INFO [stderr] 5 |     pub struct NewsArticle {
Dec 13 23:44:00.450 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr]   |
Dec 13 23:44:00.450 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: struct is never constructed: `Tweet`
Dec 13 23:44:00.450 INFO [stderr]   --> src/news_aggregator/mod.rs:18:5
Dec 13 23:44:00.450 INFO [stderr]    |
Dec 13 23:44:00.450 INFO [stderr] 18 |     pub struct Tweet {
Dec 13 23:44:00.450 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: struct is never constructed: `Pair`
Dec 13 23:44:00.450 INFO [stderr]   --> src/main.rs:18:1
Dec 13 23:44:00.450 INFO [stderr]    |
Dec 13 23:44:00.450 INFO [stderr] 18 | struct Pair<T> {
Dec 13 23:44:00.450 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: method is never used: `new`
Dec 13 23:44:00.450 INFO [stderr]   --> src/main.rs:24:5
Dec 13 23:44:00.450 INFO [stderr]    |
Dec 13 23:44:00.450 INFO [stderr] 24 |     fn new(x: T, y: T) -> Self {
Dec 13 23:44:00.450 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: method is never used: `cmp_display`
Dec 13 23:44:00.450 INFO [stderr]   --> src/main.rs:33:5
Dec 13 23:44:00.450 INFO [stderr]    |
Dec 13 23:44:00.450 INFO [stderr] 33 |     fn cmp_display(&self) {
Dec 13 23:44:00.450 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: struct is never constructed: `User`
Dec 13 23:44:00.450 INFO [stderr]   --> src/main.rs:42:1
Dec 13 23:44:00.450 INFO [stderr]    |
Dec 13 23:44:00.450 INFO [stderr] 42 | struct User {
Dec 13 23:44:00.450 INFO [stderr]    | ^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.450 INFO [stderr] warning: struct is never constructed: `Rectangle`
Dec 13 23:44:00.450 INFO [stderr]   --> src/main.rs:49:1
Dec 13 23:44:00.450 INFO [stderr]    |
Dec 13 23:44:00.450 INFO [stderr] 49 | struct Rectangle {
Dec 13 23:44:00.450 INFO [stderr]    | ^^^^^^^^^^^^^^^^
Dec 13 23:44:00.450 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: method is never used: `area`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:55:5
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 55 |     fn area(&self) -> u32 {
Dec 13 23:44:00.451 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: method is never used: `can_hold`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:59:5
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 59 |     fn can_hold(&self, other: &Rectangle) -> bool {
Dec 13 23:44:00.451 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: method is never used: `square`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:63:5
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 63 |     fn square(size: u32) -> Rectangle {
Dec 13 23:44:00.451 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: enum is never used: `IpAddrKind`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:68:1
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 68 | enum IpAddrKind {
Dec 13 23:44:00.451 INFO [stderr]    | ^^^^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: enum is never used: `UsState`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:74:1
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 74 | enum UsState {
Dec 13 23:44:00.451 INFO [stderr]    | ^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: enum is never used: `Coin`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:80:1
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 80 | enum Coin {
Dec 13 23:44:00.451 INFO [stderr]    | ^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: enum is never used: `Message`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:87:1
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 87 | enum Message {
Dec 13 23:44:00.451 INFO [stderr]    | ^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: method is never used: `call`
Dec 13 23:44:00.451 INFO [stderr]   --> src/main.rs:95:5
Dec 13 23:44:00.451 INFO [stderr]    |
Dec 13 23:44:00.451 INFO [stderr] 95 |     fn call(&self) {
Dec 13 23:44:00.451 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: function is never used: `largest`
Dec 13 23:44:00.451 INFO [stderr]    --> src/main.rs:100:2
Dec 13 23:44:00.451 INFO [stderr]     |
Dec 13 23:44:00.451 INFO [stderr] 100 |  fn largest<T : PartialOrd>(list: &[T]) -> &T {
Dec 13 23:44:00.451 INFO [stderr]     |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.451 INFO [stderr] 
Dec 13 23:44:00.451 INFO [stderr] warning: struct is never constructed: `Point`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:112:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 112 | struct Point<T> {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `simulated_expensive_calculation`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:204:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 204 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `closure_capturing_context`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:210:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 210 | fn closure_capturing_context() {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `iterators`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:217:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 217 | fn iterators() {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `iterator_map`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:226:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 226 | fn iterator_map() {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `iterator_sum`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:232:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 232 | fn iterator_sum() {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `news_aggregate`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:269:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 269 | fn news_aggregate() {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: function is never used: `vector`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:305:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 305 | fn vector() {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: struct is never constructed: `Counter`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:325:1
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 325 | struct Counter {
Dec 13 23:44:00.452 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 13 23:44:00.452 INFO [stderr] 
Dec 13 23:44:00.452 INFO [stderr] warning: method is never used: `new`
Dec 13 23:44:00.452 INFO [stderr]    --> src/main.rs:330:5
Dec 13 23:44:00.452 INFO [stderr]     |
Dec 13 23:44:00.452 INFO [stderr] 330 |     fn new() -> Counter {
Dec 13 23:44:00.453 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.453 INFO [stderr] warning: function is never used: `if_let`
Dec 13 23:44:00.453 INFO [stderr]    --> src/main.rs:351:1
Dec 13 23:44:00.453 INFO [stderr]     |
Dec 13 23:44:00.453 INFO [stderr] 351 | fn if_let() {
Dec 13 23:44:00.453 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.453 INFO [stderr] warning: function is never used: `value_in_cents`
Dec 13 23:44:00.453 INFO [stderr]    --> src/main.rs:359:1
Dec 13 23:44:00.453 INFO [stderr]     |
Dec 13 23:44:00.453 INFO [stderr] 359 | fn value_in_cents(coin : Coin) -> u32 {
Dec 13 23:44:00.453 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.453 INFO [stderr] warning: function is never used: `option`
Dec 13 23:44:00.453 INFO [stderr]    --> src/main.rs:371:1
Dec 13 23:44:00.453 INFO [stderr]     |
Dec 13 23:44:00.453 INFO [stderr] 371 | fn option() {
Dec 13 23:44:00.453 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.453 INFO [stderr] warning: function is never used: `messages`
Dec 13 23:44:00.453 INFO [stderr]    --> src/main.rs:378:1
Dec 13 23:44:00.453 INFO [stderr]     |
Dec 13 23:44:00.453 INFO [stderr] 378 | fn messages() {
Dec 13 23:44:00.453 INFO [stderr]     | ^^^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.453 INFO [stderr] warning: function is never used: `rectangles`
Dec 13 23:44:00.453 INFO [stderr]    --> src/main.rs:383:1
Dec 13 23:44:00.453 INFO [stderr]     |
Dec 13 23:44:00.453 INFO [stderr] 383 | fn rectangles() {
Dec 13 23:44:00.453 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.453 INFO [stderr] warning: function is never used: `build_user`
Dec 13 23:44:00.453 INFO [stderr]    --> src/main.rs:395:1
Dec 13 23:44:00.453 INFO [stderr]     |
Dec 13 23:44:00.453 INFO [stderr] 395 | fn build_user(email: String, username: String) -> User {
Dec 13 23:44:00.453 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.453 INFO [stderr] 
Dec 13 23:44:00.454 INFO [stderr] warning: function is never used: `coins`
Dec 13 23:44:00.454 INFO [stderr]    --> src/main.rs:404:1
Dec 13 23:44:00.454 INFO [stderr]     |
Dec 13 23:44:00.454 INFO [stderr] 404 | fn coins() {
Dec 13 23:44:00.454 INFO [stderr]     | ^^^^^^^^^^
Dec 13 23:44:00.454 INFO [stderr] 
Dec 13 23:44:00.454 INFO [stderr] warning: function is never used: `slices`
Dec 13 23:44:00.454 INFO [stderr]    --> src/main.rs:409:1
Dec 13 23:44:00.454 INFO [stderr]     |
Dec 13 23:44:00.454 INFO [stderr] 409 | fn slices() {
Dec 13 23:44:00.454 INFO [stderr]     | ^^^^^^^^^^^
Dec 13 23:44:00.454 INFO [stderr] 
Dec 13 23:44:00.454 INFO [stderr] warning: function is never used: `takes_ownership`
Dec 13 23:44:00.454 INFO [stderr]    --> src/main.rs:419:1
Dec 13 23:44:00.454 INFO [stderr]     |
Dec 13 23:44:00.454 INFO [stderr] 419 | fn takes_ownership(some_string: String) {
Dec 13 23:44:00.454 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.454 INFO [stderr] 
Dec 13 23:44:00.454 INFO [stderr] warning: function is never used: `makes_copy`
Dec 13 23:44:00.454 INFO [stderr]    --> src/main.rs:423:1
Dec 13 23:44:00.454 INFO [stderr]     |
Dec 13 23:44:00.454 INFO [stderr] 423 | fn makes_copy(some_integer: i32) {
Dec 13 23:44:00.454 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.454 INFO [stderr] 
Dec 13 23:44:00.455 INFO [stderr] warning: function is never used: `first_word`
Dec 13 23:44:00.455 INFO [stderr]    --> src/main.rs:427:1
Dec 13 23:44:00.455 INFO [stderr]     |
Dec 13 23:44:00.455 INFO [stderr] 427 | fn first_word(s: &String) -> usize {
Dec 13 23:44:00.455 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.455 INFO [stderr] 
Dec 13 23:44:00.455 INFO [stderr] warning: function is never used: `guess_number`
Dec 13 23:44:00.455 INFO [stderr]    --> src/main.rs:440:1
Dec 13 23:44:00.455 INFO [stderr]     |
Dec 13 23:44:00.455 INFO [stderr] 440 | fn guess_number() {
Dec 13 23:44:00.455 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.455 INFO [stderr] 
Dec 13 23:44:00.457 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 23:44:00.457 INFO [stderr]    --> src/main.rs:245:5
Dec 13 23:44:00.457 INFO [stderr]     |
Dec 13 23:44:00.457 INFO [stderr] 245 |     read_username_from_file();
Dec 13 23:44:00.457 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 23:44:00.457 INFO [stderr]     |
Dec 13 23:44:00.457 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 13 23:44:00.457 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 23:44:00.457 INFO [stderr] 
Dec 13 23:44:01.169 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
Dec 13 23:44:01.173 INFO [stderr] su: No module specific data is present
Dec 13 23:44:01.977 INFO running `"docker" "inspect" "3a32604be53c96519db80940895eb32142b0d5dd02359e5d3bc45bc6440c6086"`
Dec 13 23:44:02.087 INFO running `"docker" "rm" "-f" "3a32604be53c96519db80940895eb32142b0d5dd02359e5d3bc45bc6440c6086"`
Dec 13 23:44:02.221 INFO [stdout] 3a32604be53c96519db80940895eb32142b0d5dd02359e5d3bc45bc6440c6086
Dec 13 23:44:02.223 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-3/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 23:44:02.618 INFO [stdout] fb5e1b548d4ccc968d57bb3b230097dbd710d217e9ba7b0169638f250244171d
Dec 13 23:44:02.623 INFO running `"docker" "start" "-a" "fb5e1b548d4ccc968d57bb3b230097dbd710d217e9ba7b0169638f250244171d"`
Dec 13 23:44:03.424 INFO [stderr] usermod: no changes
Dec 13 23:44:03.475 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
Dec 13 23:44:03.478 INFO [stderr]      Running /target/debug/deps/rust_exploration-a9173070b16e6953
Dec 13 23:44:03.480 INFO [stdout] 
Dec 13 23:44:03.480 INFO [stdout] running 1 test
Dec 13 23:44:03.480 INFO [stdout] test filters_by_size ... ok
Dec 13 23:44:03.480 INFO [stdout] 
Dec 13 23:44:03.480 INFO [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 13 23:44:03.480 INFO [stdout] 
Dec 13 23:44:03.482 INFO [stderr] su: No module specific data is present
Dec 13 23:44:03.845 INFO running `"docker" "inspect" "fb5e1b548d4ccc968d57bb3b230097dbd710d217e9ba7b0169638f250244171d"`
Dec 13 23:44:04.083 INFO running `"docker" "rm" "-f" "fb5e1b548d4ccc968d57bb3b230097dbd710d217e9ba7b0169638f250244171d"`
Dec 13 23:44:04.202 INFO [stdout] fb5e1b548d4ccc968d57bb3b230097dbd710d217e9ba7b0169638f250244171d