Dec 18 03:47:33.159 INFO checking ashishnegi/learn-rust against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 03:47:33.160 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-6/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/ashishnegi/learn-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 03:47:33.812 INFO [stdout] ef92caebb7ca30fa061ea07840652326228bb45d43c47063506d9adbc98c2a4a
Dec 18 03:47:33.814 INFO running `"docker" "start" "-a" "ef92caebb7ca30fa061ea07840652326228bb45d43c47063506d9adbc98c2a4a"`
Dec 18 03:47:35.554 INFO [stderr]     Checking learnrust v0.1.0 (/opt/crater/workdir)
Dec 18 03:47:36.312 INFO [stderr] warning: struct is never constructed: `Rectangle`
Dec 18 03:47:36.312 INFO [stderr]  --> src/area.rs:2:1
Dec 18 03:47:36.312 INFO [stderr]   |
Dec 18 03:47:36.312 INFO [stderr] 2 | struct Rectangle {
Dec 18 03:47:36.312 INFO [stderr]   | ^^^^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr]   |
Dec 18 03:47:36.312 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: method is never used: `area`
Dec 18 03:47:36.312 INFO [stderr]  --> src/area.rs:8:5
Dec 18 03:47:36.312 INFO [stderr]   |
Dec 18 03:47:36.312 INFO [stderr] 8 |     fn area(&self) -> u32 {
Dec 18 03:47:36.312 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: struct is never constructed: `Square`
Dec 18 03:47:36.312 INFO [stderr]   --> src/area.rs:13:1
Dec 18 03:47:36.312 INFO [stderr]    |
Dec 18 03:47:36.312 INFO [stderr] 13 | struct Square {
Dec 18 03:47:36.312 INFO [stderr]    | ^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: method is never used: `area`
Dec 18 03:47:36.312 INFO [stderr]   --> src/area.rs:18:5
Dec 18 03:47:36.312 INFO [stderr]    |
Dec 18 03:47:36.312 INFO [stderr] 18 |     fn area(&self) -> u32 {
Dec 18 03:47:36.312 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: function is never used: `plus_one`
Dec 18 03:47:36.312 INFO [stderr]   --> src/maybe.rs:15:1
Dec 18 03:47:36.312 INFO [stderr]    |
Dec 18 03:47:36.312 INFO [stderr] 15 | fn plus_one(there: Option<u32>) -> Option<u32> {
Dec 18 03:47:36.312 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: function is never used: `merge_sort`
Dec 18 03:47:36.312 INFO [stderr]  --> src/collection.rs:2:1
Dec 18 03:47:36.312 INFO [stderr]   |
Dec 18 03:47:36.312 INFO [stderr] 2 | fn merge_sort(arr: & mut[u32], start: usize, end: usize) {
Dec 18 03:47:36.312 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: enum is never used: `TeaError`
Dec 18 03:47:36.312 INFO [stderr]  --> src/errors.rs:1:1
Dec 18 03:47:36.312 INFO [stderr]   |
Dec 18 03:47:36.312 INFO [stderr] 1 | enum TeaError {
Dec 18 03:47:36.312 INFO [stderr]   | ^^^^^^^^^^^^^
Dec 18 03:47:36.312 INFO [stderr] 
Dec 18 03:47:36.312 INFO [stderr] warning: function is never used: `append`
Dec 18 03:47:36.312 INFO [stderr]  --> src/errors.rs:9:1
Dec 18 03:47:36.312 INFO [stderr]   |
Dec 18 03:47:36.312 INFO [stderr] 9 | fn append(s1: String, s2: String) -> String {
Dec 18 03:47:36.312 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `get_milk_from_cow`
Dec 18 03:47:36.313 INFO [stderr]   --> src/errors.rs:13:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 13 | fn get_milk_from_cow(cow: bool) -> Result<String, TeaError> {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `pour_milk`
Dec 18 03:47:36.313 INFO [stderr]   --> src/errors.rs:21:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 21 | fn pour_milk(milk: bool) -> Result<String, TeaError> {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `make_tea`
Dec 18 03:47:36.313 INFO [stderr]   --> src/errors.rs:29:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 29 | fn make_tea() -> Result<String, TeaError> {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `largest`
Dec 18 03:47:36.313 INFO [stderr]  --> src/traits.rs:1:1
Dec 18 03:47:36.313 INFO [stderr]   |
Dec 18 03:47:36.313 INFO [stderr] 1 | fn largest<T: PartialOrd>(ts: &[T]) -> &T {
Dec 18 03:47:36.313 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: struct is never constructed: `Human`
Dec 18 03:47:36.313 INFO [stderr]   --> src/traits.rs:17:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 17 | struct Human {}
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: struct is never constructed: `Cat`
Dec 18 03:47:36.313 INFO [stderr]   --> src/traits.rs:18:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 18 | struct Cat {}
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: struct is never constructed: `Res`
Dec 18 03:47:36.313 INFO [stderr]  --> src/grep.rs:5:1
Dec 18 03:47:36.313 INFO [stderr]   |
Dec 18 03:47:36.313 INFO [stderr] 5 | struct Res {
Dec 18 03:47:36.313 INFO [stderr]   | ^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `search_contents`
Dec 18 03:47:36.313 INFO [stderr]   --> src/grep.rs:10:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 10 | fn search_contents(contents: &str, search: &str) -> Vec<Res> {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `grep`
Dec 18 03:47:36.313 INFO [stderr]   --> src/grep.rs:25:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 25 | fn grep(filename: &str, search: &str) -> Result<Vec<Res>, Error> {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `add_one`
Dec 18 03:47:36.313 INFO [stderr]  --> src/closures.rs:1:1
Dec 18 03:47:36.313 INFO [stderr]   |
Dec 18 03:47:36.313 INFO [stderr] 1 | / fn add_one<F>(closure: F, y: u32) -> u32
Dec 18 03:47:36.313 INFO [stderr] 2 | |     where F: Fn(u32) -> u32
Dec 18 03:47:36.313 INFO [stderr] 3 | | {
Dec 18 03:47:36.313 INFO [stderr] 4 | |     closure(y) + 1
Dec 18 03:47:36.313 INFO [stderr] 5 | | }
Dec 18 03:47:36.313 INFO [stderr]   | |_^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `add`
Dec 18 03:47:36.313 INFO [stderr]  --> src/closures.rs:7:1
Dec 18 03:47:36.313 INFO [stderr]   |
Dec 18 03:47:36.313 INFO [stderr] 7 | fn add(x: u32, y: u32) -> u32 {
Dec 18 03:47:36.313 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: struct is never constructed: `Even`
Dec 18 03:47:36.313 INFO [stderr]   --> src/closures.rs:17:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 17 | struct Even {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: struct is never constructed: `Node`
Dec 18 03:47:36.313 INFO [stderr]  --> src/tree.rs:5:1
Dec 18 03:47:36.313 INFO [stderr]   |
Dec 18 03:47:36.313 INFO [stderr] 5 | struct Node {
Dec 18 03:47:36.313 INFO [stderr]   | ^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `make_tree`
Dec 18 03:47:36.313 INFO [stderr]   --> src/tree.rs:11:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.313 INFO [stderr] 11 | fn make_tree() {
Dec 18 03:47:36.313 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `thread1`
Dec 18 03:47:36.313 INFO [stderr]  --> src/threads.rs:5:1
Dec 18 03:47:36.313 INFO [stderr]   |
Dec 18 03:47:36.313 INFO [stderr] 5 | fn thread1() {
Dec 18 03:47:36.313 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 03:47:36.313 INFO [stderr] 
Dec 18 03:47:36.313 INFO [stderr] warning: function is never used: `channels`
Dec 18 03:47:36.313 INFO [stderr]   --> src/threads.rs:17:1
Dec 18 03:47:36.313 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 17 | fn channels() {
Dec 18 03:47:36.314 INFO [stderr]    | ^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: struct is never constructed: `Post`
Dec 18 03:47:36.314 INFO [stderr]  --> src/posts.rs:1:1
Dec 18 03:47:36.314 INFO [stderr]   |
Dec 18 03:47:36.314 INFO [stderr] 1 | struct Post {
Dec 18 03:47:36.314 INFO [stderr]   | ^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: struct is never constructed: `DraftPost`
Dec 18 03:47:36.314 INFO [stderr]  --> src/posts.rs:5:1
Dec 18 03:47:36.314 INFO [stderr]   |
Dec 18 03:47:36.314 INFO [stderr] 5 | struct DraftPost {
Dec 18 03:47:36.314 INFO [stderr]   | ^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: struct is never constructed: `PendingPost`
Dec 18 03:47:36.314 INFO [stderr]  --> src/posts.rs:9:1
Dec 18 03:47:36.314 INFO [stderr]   |
Dec 18 03:47:36.314 INFO [stderr] 9 | struct PendingPost {
Dec 18 03:47:36.314 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `new`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:16:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 16 |     fn new() -> DraftPost {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `content`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:20:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 20 |     fn content(&self) -> &str {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `req_review`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:26:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 26 |     fn req_review(self) -> PendingPost {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `add_text`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:33:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 33 |     fn add_text(&mut self, content: &str) {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: enum is never used: `PublishResult`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:38:1
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 38 | enum PublishResult {
Dec 18 03:47:36.314 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `approve`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:44:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 44 |     fn approve(&mut self) {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `reject`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:47:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 47 |     fn reject(self) -> DraftPost {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.314 INFO [stderr] warning: method is never used: `publish`
Dec 18 03:47:36.314 INFO [stderr]   --> src/posts.rs:50:5
Dec 18 03:47:36.314 INFO [stderr]    |
Dec 18 03:47:36.314 INFO [stderr] 50 |     fn publish(self) -> PublishResult {
Dec 18 03:47:36.314 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:47:36.314 INFO [stderr] 
Dec 18 03:47:36.368 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
Dec 18 03:47:37.617 INFO running `"docker" "inspect" "ef92caebb7ca30fa061ea07840652326228bb45d43c47063506d9adbc98c2a4a"`
Dec 18 03:47:37.960 INFO running `"docker" "rm" "-f" "ef92caebb7ca30fa061ea07840652326228bb45d43c47063506d9adbc98c2a4a"`
Dec 18 03:47:38.300 INFO [stdout] ef92caebb7ca30fa061ea07840652326228bb45d43c47063506d9adbc98c2a4a