Dec 06 03:53:45.635 INFO testing chrisp9/rust_exploration against master#906deae0790bd18681b937fe9a141a3c26cf1855 for pr-56514
Dec 06 03:53:45.635 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-6/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 06 03:53:45.784 INFO [stdout] 7d954d615c725ae5c06f11329ba38d413a5d31f8476fd1fdfe9e2f6f9b3153ba
Dec 06 03:53:45.789 INFO running `"docker" "start" "-a" "7d954d615c725ae5c06f11329ba38d413a5d31f8476fd1fdfe9e2f6f9b3153ba"`
Dec 06 03:53:46.653 INFO [stderr] usermod: no changes
Dec 06 03:53:46.724 INFO [stderr]    Compiling rust_exploration v0.1.0 (/source)
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `num`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:177:45
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 177 |     let mut expensive_result = Cacher::new(|num| {
Dec 06 03:53:47.368 INFO [stderr]     |                                             ^^^ help: consider using `_num` instead
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `equal_to_x`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:212:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 212 |     let equal_to_x = |z : u32| z == x;
Dec 06 03:53:47.368 INFO [stderr]     |         ^^^^^^^^^^ help: consider using `_equal_to_x` instead
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `y`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:213:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 213 |     let y = 4;
Dec 06 03:53:47.368 INFO [stderr]     |         ^ help: consider using `_y` instead
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `res`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:229:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 229 |     let res: Vec<_> = v1.iter().map(|x| x + 1).collect();
Dec 06 03:53:47.368 INFO [stderr]     |         ^^^ help: consider using `_res` instead
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `total`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:236:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 236 |     let total: i32 = v1_iter.sum();
Dec 06 03:53:47.368 INFO [stderr]     |         ^^^^^ help: consider using `_total` instead
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `item`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:289:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 289 |     let item = map.get(&key).unwrap();
Dec 06 03:53:47.368 INFO [stderr]     |         ^^^^ help: consider using `_item` instead
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `s3`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:296:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 296 |     let s3 = s1 + &s2;
Dec 06 03:53:47.368 INFO [stderr]     |         ^^ help: consider using `_s3` instead
Dec 06 03:53:47.368 INFO [stderr] 
Dec 06 03:53:47.368 INFO [stderr] warning: unused variable: `v`
Dec 06 03:53:47.368 INFO [stderr]    --> src/main.rs:306:9
Dec 06 03:53:47.368 INFO [stderr]     |
Dec 06 03:53:47.368 INFO [stderr] 306 |     let v: Vec<i32> = Vec::new();
Dec 06 03:53:47.368 INFO [stderr]     |         ^ help: consider using `_v` instead
Dec 06 03:53:47.369 INFO [stderr] 
Dec 06 03:53:47.369 INFO [stderr] warning: unused variable: `third`
Dec 06 03:53:47.369 INFO [stderr]    --> src/main.rs:309:9
Dec 06 03:53:47.369 INFO [stderr]     |
Dec 06 03:53:47.369 INFO [stderr] 309 |     let third: &i32 = &v[2];
Dec 06 03:53:47.369 INFO [stderr]     |         ^^^^^ help: consider using `_third` instead
Dec 06 03:53:47.369 INFO [stderr] 
Dec 06 03:53:47.369 INFO [stderr] warning: unused variable: `some_number`
Dec 06 03:53:47.369 INFO [stderr]    --> src/main.rs:372:9
Dec 06 03:53:47.369 INFO [stderr]     |
Dec 06 03:53:47.369 INFO [stderr] 372 |     let some_number = Some(5);
Dec 06 03:53:47.369 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_number` instead
Dec 06 03:53:47.369 INFO [stderr] 
Dec 06 03:53:47.369 INFO [stderr] warning: unused variable: `some_string`
Dec 06 03:53:47.369 INFO [stderr]    --> src/main.rs:373:9
Dec 06 03:53:47.369 INFO [stderr]     |
Dec 06 03:53:47.369 INFO [stderr] 373 |     let some_string = Some("A string");
Dec 06 03:53:47.369 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_string` instead
Dec 06 03:53:47.369 INFO [stderr] 
Dec 06 03:53:47.369 INFO [stderr] warning: unused variable: `absent_number`
Dec 06 03:53:47.369 INFO [stderr]    --> src/main.rs:375:9
Dec 06 03:53:47.369 INFO [stderr]     |
Dec 06 03:53:47.369 INFO [stderr] 375 |     let absent_number : Option<i32> = None;
Dec 06 03:53:47.369 INFO [stderr]     |         ^^^^^^^^^^^^^ help: consider using `_absent_number` instead
Dec 06 03:53:47.369 INFO [stderr] 
Dec 06 03:53:47.369 INFO [stderr] warning: unused variable: `rect3`
Dec 06 03:53:47.369 INFO [stderr]    --> src/main.rs:387:9
Dec 06 03:53:47.369 INFO [stderr]     |
Dec 06 03:53:47.369 INFO [stderr] 387 |     let rect3 = Rectangle {width: 60, height: 45};
Dec 06 03:53:47.369 INFO [stderr]     |         ^^^^^ help: consider using `_rect3` instead
Dec 06 03:53:47.369 INFO [stderr] 
Dec 06 03:53:47.417 INFO [stderr] warning: struct is never constructed: `NewsArticle`
Dec 06 03:53:47.417 INFO [stderr]  --> src/news_aggregator/mod.rs:5:5
Dec 06 03:53:47.417 INFO [stderr]   |
Dec 06 03:53:47.417 INFO [stderr] 5 |     pub struct NewsArticle {
Dec 06 03:53:47.417 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.417 INFO [stderr]   |
Dec 06 03:53:47.425 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: struct is never constructed: `Tweet`
Dec 06 03:53:47.425 INFO [stderr]   --> src/news_aggregator/mod.rs:18:5
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 18 |     pub struct Tweet {
Dec 06 03:53:47.425 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: struct is never constructed: `Pair`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:18:1
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 18 | struct Pair<T> {
Dec 06 03:53:47.425 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: method is never used: `new`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:24:5
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 24 |     fn new(x: T, y: T) -> Self {
Dec 06 03:53:47.425 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: method is never used: `cmp_display`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:33:5
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 33 |     fn cmp_display(&self) {
Dec 06 03:53:47.425 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: struct is never constructed: `User`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:42:1
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 42 | struct User {
Dec 06 03:53:47.425 INFO [stderr]    | ^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: struct is never constructed: `Rectangle`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:49:1
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 49 | struct Rectangle {
Dec 06 03:53:47.425 INFO [stderr]    | ^^^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: method is never used: `area`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:55:5
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 55 |     fn area(&self) -> u32 {
Dec 06 03:53:47.425 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.425 INFO [stderr] warning: method is never used: `can_hold`
Dec 06 03:53:47.425 INFO [stderr]   --> src/main.rs:59:5
Dec 06 03:53:47.425 INFO [stderr]    |
Dec 06 03:53:47.425 INFO [stderr] 59 |     fn can_hold(&self, other: &Rectangle) -> bool {
Dec 06 03:53:47.425 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.425 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: method is never used: `square`
Dec 06 03:53:47.426 INFO [stderr]   --> src/main.rs:63:5
Dec 06 03:53:47.426 INFO [stderr]    |
Dec 06 03:53:47.426 INFO [stderr] 63 |     fn square(size: u32) -> Rectangle {
Dec 06 03:53:47.426 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: enum is never used: `IpAddrKind`
Dec 06 03:53:47.426 INFO [stderr]   --> src/main.rs:68:1
Dec 06 03:53:47.426 INFO [stderr]    |
Dec 06 03:53:47.426 INFO [stderr] 68 | enum IpAddrKind {
Dec 06 03:53:47.426 INFO [stderr]    | ^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: enum is never used: `UsState`
Dec 06 03:53:47.426 INFO [stderr]   --> src/main.rs:74:1
Dec 06 03:53:47.426 INFO [stderr]    |
Dec 06 03:53:47.426 INFO [stderr] 74 | enum UsState {
Dec 06 03:53:47.426 INFO [stderr]    | ^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: enum is never used: `Coin`
Dec 06 03:53:47.426 INFO [stderr]   --> src/main.rs:80:1
Dec 06 03:53:47.426 INFO [stderr]    |
Dec 06 03:53:47.426 INFO [stderr] 80 | enum Coin {
Dec 06 03:53:47.426 INFO [stderr]    | ^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: enum is never used: `Message`
Dec 06 03:53:47.426 INFO [stderr]   --> src/main.rs:87:1
Dec 06 03:53:47.426 INFO [stderr]    |
Dec 06 03:53:47.426 INFO [stderr] 87 | enum Message {
Dec 06 03:53:47.426 INFO [stderr]    | ^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: method is never used: `call`
Dec 06 03:53:47.426 INFO [stderr]   --> src/main.rs:95:5
Dec 06 03:53:47.426 INFO [stderr]    |
Dec 06 03:53:47.426 INFO [stderr] 95 |     fn call(&self) {
Dec 06 03:53:47.426 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `largest`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:100:2
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 100 |  fn largest<T : PartialOrd>(list: &[T]) -> &T {
Dec 06 03:53:47.426 INFO [stderr]     |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: struct is never constructed: `Point`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:112:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 112 | struct Point<T> {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `shoes_in_my_size`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:123:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 123 | fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `simulated_expensive_calculation`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:204:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 204 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `closure_capturing_context`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:210:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 210 | fn closure_capturing_context() {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `iterators`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:217:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 217 | fn iterators() {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `iterator_map`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:226:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 226 | fn iterator_map() {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `iterator_sum`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:232:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 232 | fn iterator_sum() {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.426 INFO [stderr] 
Dec 06 03:53:47.426 INFO [stderr] warning: function is never used: `news_aggregate`
Dec 06 03:53:47.426 INFO [stderr]    --> src/main.rs:269:1
Dec 06 03:53:47.426 INFO [stderr]     |
Dec 06 03:53:47.426 INFO [stderr] 269 | fn news_aggregate() {
Dec 06 03:53:47.426 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `vector`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:305:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 305 | fn vector() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: struct is never constructed: `Counter`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:325:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 325 | struct Counter {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: method is never used: `new`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:330:5
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 330 |     fn new() -> Counter {
Dec 06 03:53:47.427 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `if_let`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:351:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 351 | fn if_let() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `value_in_cents`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:359:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 359 | fn value_in_cents(coin : Coin) -> u32 {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `option`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:371:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 371 | fn option() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `messages`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:378:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 378 | fn messages() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `rectangles`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:383:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 383 | fn rectangles() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `build_user`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:395:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 395 | fn build_user(email: String, username: String) -> User {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `coins`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:404:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 404 | fn coins() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `slices`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:409:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 409 | fn slices() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `takes_ownership`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:419:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 419 | fn takes_ownership(some_string: String) {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `makes_copy`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:423:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 423 | fn makes_copy(some_integer: i32) {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `first_word`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:427:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 427 | fn first_word(s: &String) -> usize {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.427 INFO [stderr] 
Dec 06 03:53:47.427 INFO [stderr] warning: function is never used: `guess_number`
Dec 06 03:53:47.427 INFO [stderr]    --> src/main.rs:440:1
Dec 06 03:53:47.427 INFO [stderr]     |
Dec 06 03:53:47.427 INFO [stderr] 440 | fn guess_number() {
Dec 06 03:53:47.427 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.428 INFO [stderr] 
Dec 06 03:53:47.428 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 06 03:53:47.428 INFO [stderr]    --> src/main.rs:245:5
Dec 06 03:53:47.428 INFO [stderr]     |
Dec 06 03:53:47.428 INFO [stderr] 245 |     read_username_from_file();
Dec 06 03:53:47.428 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:47.428 INFO [stderr]     |
Dec 06 03:53:47.428 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 06 03:53:47.428 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 06 03:53:47.428 INFO [stderr] 
Dec 06 03:53:48.106 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.42s
Dec 06 03:53:48.106 INFO [stderr] su: No module specific data is present
Dec 06 03:53:48.495 INFO running `"docker" "inspect" "7d954d615c725ae5c06f11329ba38d413a5d31f8476fd1fdfe9e2f6f9b3153ba"`
Dec 06 03:53:48.826 INFO running `"docker" "rm" "-f" "7d954d615c725ae5c06f11329ba38d413a5d31f8476fd1fdfe9e2f6f9b3153ba"`
Dec 06 03:53:49.064 INFO [stdout] 7d954d615c725ae5c06f11329ba38d413a5d31f8476fd1fdfe9e2f6f9b3153ba
Dec 06 03:53:49.070 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-6/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 06 03:53:49.650 INFO [stdout] 433400ab6d5aead490b90fbffbe20242e2d2d8f7bc1183f999c17d93d8911776
Dec 06 03:53:49.652 INFO running `"docker" "start" "-a" "433400ab6d5aead490b90fbffbe20242e2d2d8f7bc1183f999c17d93d8911776"`
Dec 06 03:53:50.908 INFO [stderr] usermod: no changes
Dec 06 03:53:50.976 INFO [stderr]    Compiling rust_exploration v0.1.0 (/source)
Dec 06 03:53:51.524 INFO [stderr] warning: unused variable: `num`
Dec 06 03:53:51.524 INFO [stderr]    --> src/main.rs:177:45
Dec 06 03:53:51.524 INFO [stderr]     |
Dec 06 03:53:51.524 INFO [stderr] 177 |     let mut expensive_result = Cacher::new(|num| {
Dec 06 03:53:51.525 INFO [stderr]     |                                             ^^^ help: consider using `_num` instead
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `equal_to_x`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:212:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 212 |     let equal_to_x = |z : u32| z == x;
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^^^^^^ help: consider using `_equal_to_x` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `y`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:213:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 213 |     let y = 4;
Dec 06 03:53:51.525 INFO [stderr]     |         ^ help: consider using `_y` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `res`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:229:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 229 |     let res: Vec<_> = v1.iter().map(|x| x + 1).collect();
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^ help: consider using `_res` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `total`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:236:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 236 |     let total: i32 = v1_iter.sum();
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^ help: consider using `_total` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `item`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:289:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 289 |     let item = map.get(&key).unwrap();
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^ help: consider using `_item` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `s3`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:296:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 296 |     let s3 = s1 + &s2;
Dec 06 03:53:51.525 INFO [stderr]     |         ^^ help: consider using `_s3` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `v`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:306:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 306 |     let v: Vec<i32> = Vec::new();
Dec 06 03:53:51.525 INFO [stderr]     |         ^ help: consider using `_v` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `third`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:309:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 309 |     let third: &i32 = &v[2];
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^ help: consider using `_third` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `some_number`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:372:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 372 |     let some_number = Some(5);
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_number` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `some_string`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:373:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 373 |     let some_string = Some("A string");
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^^^^^^^ help: consider using `_some_string` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `absent_number`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:375:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 375 |     let absent_number : Option<i32> = None;
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^^^^^^^^^ help: consider using `_absent_number` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.525 INFO [stderr] warning: unused variable: `rect3`
Dec 06 03:53:51.525 INFO [stderr]    --> src/main.rs:387:9
Dec 06 03:53:51.525 INFO [stderr]     |
Dec 06 03:53:51.525 INFO [stderr] 387 |     let rect3 = Rectangle {width: 60, height: 45};
Dec 06 03:53:51.525 INFO [stderr]     |         ^^^^^ help: consider using `_rect3` instead
Dec 06 03:53:51.525 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: struct is never constructed: `NewsArticle`
Dec 06 03:53:51.569 INFO [stderr]  --> src/news_aggregator/mod.rs:5:5
Dec 06 03:53:51.569 INFO [stderr]   |
Dec 06 03:53:51.569 INFO [stderr] 5 |     pub struct NewsArticle {
Dec 06 03:53:51.569 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr]   |
Dec 06 03:53:51.569 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: struct is never constructed: `Tweet`
Dec 06 03:53:51.569 INFO [stderr]   --> src/news_aggregator/mod.rs:18:5
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.569 INFO [stderr] 18 |     pub struct Tweet {
Dec 06 03:53:51.569 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: struct is never constructed: `Pair`
Dec 06 03:53:51.569 INFO [stderr]   --> src/main.rs:18:1
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.569 INFO [stderr] 18 | struct Pair<T> {
Dec 06 03:53:51.569 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: method is never used: `new`
Dec 06 03:53:51.569 INFO [stderr]   --> src/main.rs:24:5
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.569 INFO [stderr] 24 |     fn new(x: T, y: T) -> Self {
Dec 06 03:53:51.569 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: method is never used: `cmp_display`
Dec 06 03:53:51.569 INFO [stderr]   --> src/main.rs:33:5
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.569 INFO [stderr] 33 |     fn cmp_display(&self) {
Dec 06 03:53:51.569 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: struct is never constructed: `User`
Dec 06 03:53:51.569 INFO [stderr]   --> src/main.rs:42:1
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.569 INFO [stderr] 42 | struct User {
Dec 06 03:53:51.569 INFO [stderr]    | ^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: struct is never constructed: `Rectangle`
Dec 06 03:53:51.569 INFO [stderr]   --> src/main.rs:49:1
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.569 INFO [stderr] 49 | struct Rectangle {
Dec 06 03:53:51.569 INFO [stderr]    | ^^^^^^^^^^^^^^^^
Dec 06 03:53:51.569 INFO [stderr] 
Dec 06 03:53:51.569 INFO [stderr] warning: method is never used: `area`
Dec 06 03:53:51.569 INFO [stderr]   --> src/main.rs:55:5
Dec 06 03:53:51.569 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 55 |     fn area(&self) -> u32 {
Dec 06 03:53:51.570 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: method is never used: `can_hold`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:59:5
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 59 |     fn can_hold(&self, other: &Rectangle) -> bool {
Dec 06 03:53:51.570 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: method is never used: `square`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:63:5
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 63 |     fn square(size: u32) -> Rectangle {
Dec 06 03:53:51.570 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: enum is never used: `IpAddrKind`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:68:1
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 68 | enum IpAddrKind {
Dec 06 03:53:51.570 INFO [stderr]    | ^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: enum is never used: `UsState`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:74:1
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 74 | enum UsState {
Dec 06 03:53:51.570 INFO [stderr]    | ^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: enum is never used: `Coin`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:80:1
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 80 | enum Coin {
Dec 06 03:53:51.570 INFO [stderr]    | ^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: enum is never used: `Message`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:87:1
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 87 | enum Message {
Dec 06 03:53:51.570 INFO [stderr]    | ^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: method is never used: `call`
Dec 06 03:53:51.570 INFO [stderr]   --> src/main.rs:95:5
Dec 06 03:53:51.570 INFO [stderr]    |
Dec 06 03:53:51.570 INFO [stderr] 95 |     fn call(&self) {
Dec 06 03:53:51.570 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: function is never used: `largest`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:100:2
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 100 |  fn largest<T : PartialOrd>(list: &[T]) -> &T {
Dec 06 03:53:51.570 INFO [stderr]     |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: struct is never constructed: `Point`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:112:1
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 112 | struct Point<T> {
Dec 06 03:53:51.570 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: function is never used: `simulated_expensive_calculation`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:204:1
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 204 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
Dec 06 03:53:51.570 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: function is never used: `closure_capturing_context`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:210:1
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 210 | fn closure_capturing_context() {
Dec 06 03:53:51.570 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: function is never used: `iterators`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:217:1
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 217 | fn iterators() {
Dec 06 03:53:51.570 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: function is never used: `iterator_map`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:226:1
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 226 | fn iterator_map() {
Dec 06 03:53:51.570 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.570 INFO [stderr] 
Dec 06 03:53:51.570 INFO [stderr] warning: function is never used: `iterator_sum`
Dec 06 03:53:51.570 INFO [stderr]    --> src/main.rs:232:1
Dec 06 03:53:51.570 INFO [stderr]     |
Dec 06 03:53:51.570 INFO [stderr] 232 | fn iterator_sum() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `news_aggregate`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:269:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 269 | fn news_aggregate() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `vector`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:305:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 305 | fn vector() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: struct is never constructed: `Counter`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:325:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 325 | struct Counter {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: method is never used: `new`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:330:5
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 330 |     fn new() -> Counter {
Dec 06 03:53:51.571 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `if_let`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:351:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 351 | fn if_let() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `value_in_cents`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:359:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 359 | fn value_in_cents(coin : Coin) -> u32 {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `option`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:371:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 371 | fn option() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `messages`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:378:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 378 | fn messages() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `rectangles`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:383:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 383 | fn rectangles() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `build_user`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:395:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 395 | fn build_user(email: String, username: String) -> User {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `coins`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:404:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 404 | fn coins() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `slices`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:409:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 409 | fn slices() {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `takes_ownership`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:419:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 419 | fn takes_ownership(some_string: String) {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `makes_copy`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:423:1
Dec 06 03:53:51.571 INFO [stderr]     |
Dec 06 03:53:51.571 INFO [stderr] 423 | fn makes_copy(some_integer: i32) {
Dec 06 03:53:51.571 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.571 INFO [stderr] 
Dec 06 03:53:51.571 INFO [stderr] warning: function is never used: `first_word`
Dec 06 03:53:51.571 INFO [stderr]    --> src/main.rs:427:1
Dec 06 03:53:51.572 INFO [stderr]     |
Dec 06 03:53:51.572 INFO [stderr] 427 | fn first_word(s: &String) -> usize {
Dec 06 03:53:51.572 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.572 INFO [stderr] 
Dec 06 03:53:51.572 INFO [stderr] warning: function is never used: `guess_number`
Dec 06 03:53:51.572 INFO [stderr]    --> src/main.rs:440:1
Dec 06 03:53:51.572 INFO [stderr]     |
Dec 06 03:53:51.572 INFO [stderr] 440 | fn guess_number() {
Dec 06 03:53:51.572 INFO [stderr]     | ^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.572 INFO [stderr] 
Dec 06 03:53:51.572 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 06 03:53:51.572 INFO [stderr]    --> src/main.rs:245:5
Dec 06 03:53:51.572 INFO [stderr]     |
Dec 06 03:53:51.572 INFO [stderr] 245 |     read_username_from_file();
Dec 06 03:53:51.572 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 06 03:53:51.572 INFO [stderr]     |
Dec 06 03:53:51.572 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 06 03:53:51.572 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 06 03:53:51.572 INFO [stderr] 
Dec 06 03:53:52.096 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.16s
Dec 06 03:53:52.098 INFO [stderr] su: No module specific data is present
Dec 06 03:53:52.490 INFO running `"docker" "inspect" "433400ab6d5aead490b90fbffbe20242e2d2d8f7bc1183f999c17d93d8911776"`
Dec 06 03:53:52.564 INFO running `"docker" "rm" "-f" "433400ab6d5aead490b90fbffbe20242e2d2d8f7bc1183f999c17d93d8911776"`
Dec 06 03:53:52.684 INFO [stdout] 433400ab6d5aead490b90fbffbe20242e2d2d8f7bc1183f999c17d93d8911776
Dec 06 03:53:52.686 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-6/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 06 03:53:52.851 INFO [stdout] 092d212b8f931f5e3629dafdbedbc9d6a9ca6973bab28756edaf3f5e8a9fd6f5
Dec 06 03:53:52.853 INFO running `"docker" "start" "-a" "092d212b8f931f5e3629dafdbedbc9d6a9ca6973bab28756edaf3f5e8a9fd6f5"`
Dec 06 03:53:53.341 INFO [stderr] usermod: no changes
Dec 06 03:53:53.370 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
Dec 06 03:53:53.370 INFO [stderr]      Running /target/debug/deps/rust_exploration-2a4bd8a3dcd410f4
Dec 06 03:53:53.372 INFO [stdout] 
Dec 06 03:53:53.372 INFO [stdout] running 1 test
Dec 06 03:53:53.372 INFO [stdout] test filters_by_size ... ok
Dec 06 03:53:53.372 INFO [stdout] 
Dec 06 03:53:53.372 INFO [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 06 03:53:53.372 INFO [stdout] 
Dec 06 03:53:53.373 INFO [stderr] su: No module specific data is present
Dec 06 03:53:53.635 INFO running `"docker" "inspect" "092d212b8f931f5e3629dafdbedbc9d6a9ca6973bab28756edaf3f5e8a9fd6f5"`
Dec 06 03:53:53.700 INFO running `"docker" "rm" "-f" "092d212b8f931f5e3629dafdbedbc9d6a9ca6973bab28756edaf3f5e8a9fd6f5"`
Dec 06 03:53:53.784 INFO [stdout] 092d212b8f931f5e3629dafdbedbc9d6a9ca6973bab28756edaf3f5e8a9fd6f5