Oct 13 00:59:46.550 INFO checking ashishnegi/learn-rust against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 13 00:59:46.550 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-6/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-6/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/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 +4021bd0b3c5815b087d6db10ce461e7e4854ade7-alt check --frozen --all --all-targets" "-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"`
Oct 13 00:59:47.160 INFO blam! af7160b7bfe96ae781acf8e399448669f3a1bc05f5e74494fb59c8442a380cfe
Oct 13 00:59:47.169 INFO running `"docker" "start" "-a" "af7160b7bfe96ae781acf8e399448669f3a1bc05f5e74494fb59c8442a380cfe"`
Oct 13 00:59:48.684 INFO kablam! usermod: no changes
Oct 13 00:59:48.748 INFO kablam!     Checking learnrust v0.1.0 (/source)
Oct 13 00:59:49.696 INFO kablam! warning: struct is never constructed: `Rectangle`
Oct 13 00:59:49.697 INFO kablam!  --> src/area.rs:2:1
Oct 13 00:59:49.697 INFO kablam!   |
Oct 13 00:59:49.697 INFO kablam! 2 | struct Rectangle {
Oct 13 00:59:49.698 INFO kablam!   | ^^^^^^^^^^^^^^^^
Oct 13 00:59:49.698 INFO kablam!   |
Oct 13 00:59:49.698 INFO kablam!   = note: #[warn(dead_code)] on by default
Oct 13 00:59:49.698 INFO kablam! 
Oct 13 00:59:49.699 INFO kablam! warning: method is never used: `area`
Oct 13 00:59:49.699 INFO kablam!  --> src/area.rs:8:5
Oct 13 00:59:49.699 INFO kablam!   |
Oct 13 00:59:49.700 INFO kablam! 8 |     fn area(&self) -> u32 {
Oct 13 00:59:49.700 INFO kablam!   |     ^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.700 INFO kablam! 
Oct 13 00:59:49.700 INFO kablam! warning: struct is never constructed: `Square`
Oct 13 00:59:49.701 INFO kablam!   --> src/area.rs:13:1
Oct 13 00:59:49.701 INFO kablam!    |
Oct 13 00:59:49.701 INFO kablam! 13 | struct Square {
Oct 13 00:59:49.701 INFO kablam!    | ^^^^^^^^^^^^^
Oct 13 00:59:49.702 INFO kablam! 
Oct 13 00:59:49.702 INFO kablam! warning: method is never used: `area`
Oct 13 00:59:49.702 INFO kablam!   --> src/area.rs:18:5
Oct 13 00:59:49.702 INFO kablam!    |
Oct 13 00:59:49.703 INFO kablam! 18 |     fn area(&self) -> u32 {
Oct 13 00:59:49.703 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.703 INFO kablam! 
Oct 13 00:59:49.703 INFO kablam! warning: function is never used: `plus_one`
Oct 13 00:59:49.704 INFO kablam!   --> src/maybe.rs:15:1
Oct 13 00:59:49.704 INFO kablam!    |
Oct 13 00:59:49.704 INFO kablam! 15 | fn plus_one(there: Option<u32>) -> Option<u32> {
Oct 13 00:59:49.704 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.705 INFO kablam! 
Oct 13 00:59:49.705 INFO kablam! warning: function is never used: `merge_sort`
Oct 13 00:59:49.705 INFO kablam!  --> src/collection.rs:2:1
Oct 13 00:59:49.706 INFO kablam!   |
Oct 13 00:59:49.706 INFO kablam! 2 | fn merge_sort(arr: & mut[u32], start: usize, end: usize) {
Oct 13 00:59:49.706 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.706 INFO kablam! 
Oct 13 00:59:49.706 INFO kablam! warning: enum is never used: `TeaError`
Oct 13 00:59:49.707 INFO kablam!  --> src/errors.rs:1:1
Oct 13 00:59:49.707 INFO kablam!   |
Oct 13 00:59:49.707 INFO kablam! 1 | enum TeaError {
Oct 13 00:59:49.708 INFO kablam!   | ^^^^^^^^^^^^^
Oct 13 00:59:49.708 INFO kablam! 
Oct 13 00:59:49.708 INFO kablam! warning: function is never used: `append`
Oct 13 00:59:49.708 INFO kablam!  --> src/errors.rs:9:1
Oct 13 00:59:49.709 INFO kablam!   |
Oct 13 00:59:49.709 INFO kablam! 9 | fn append(s1: String, s2: String) -> String {
Oct 13 00:59:49.709 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.709 INFO kablam! 
Oct 13 00:59:49.710 INFO kablam! warning: function is never used: `get_milk_from_cow`
Oct 13 00:59:49.710 INFO kablam!   --> src/errors.rs:13:1
Oct 13 00:59:49.710 INFO kablam!    |
Oct 13 00:59:49.710 INFO kablam! 13 | fn get_milk_from_cow(cow: bool) -> Result<String, TeaError> {
Oct 13 00:59:49.711 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.711 INFO kablam! 
Oct 13 00:59:49.711 INFO kablam! warning: function is never used: `pour_milk`
Oct 13 00:59:49.711 INFO kablam!   --> src/errors.rs:21:1
Oct 13 00:59:49.712 INFO kablam!    |
Oct 13 00:59:49.712 INFO kablam! 21 | fn pour_milk(milk: bool) -> Result<String, TeaError> {
Oct 13 00:59:49.712 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.712 INFO kablam! 
Oct 13 00:59:49.713 INFO kablam! warning: function is never used: `make_tea`
Oct 13 00:59:49.713 INFO kablam!   --> src/errors.rs:29:1
Oct 13 00:59:49.713 INFO kablam!    |
Oct 13 00:59:49.713 INFO kablam! 29 | fn make_tea() -> Result<String, TeaError> {
Oct 13 00:59:49.714 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.714 INFO kablam! 
Oct 13 00:59:49.714 INFO kablam! warning: function is never used: `largest`
Oct 13 00:59:49.715 INFO kablam!  --> src/traits.rs:1:1
Oct 13 00:59:49.715 INFO kablam!   |
Oct 13 00:59:49.715 INFO kablam! 1 | fn largest<T: PartialOrd>(ts: &[T]) -> &T {
Oct 13 00:59:49.715 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.716 INFO kablam! 
Oct 13 00:59:49.716 INFO kablam! warning: struct is never constructed: `Human`
Oct 13 00:59:49.720 INFO kablam!   --> src/traits.rs:17:1
Oct 13 00:59:49.720 INFO kablam!    |
Oct 13 00:59:49.721 INFO kablam! 17 | struct Human {}
Oct 13 00:59:49.721 INFO kablam!    | ^^^^^^^^^^^^
Oct 13 00:59:49.721 INFO kablam! 
Oct 13 00:59:49.721 INFO kablam! warning: struct is never constructed: `Cat`
Oct 13 00:59:49.722 INFO kablam!   --> src/traits.rs:18:1
Oct 13 00:59:49.722 INFO kablam!    |
Oct 13 00:59:49.722 INFO kablam! 18 | struct Cat {}
Oct 13 00:59:49.722 INFO kablam!    | ^^^^^^^^^^
Oct 13 00:59:49.723 INFO kablam! 
Oct 13 00:59:49.723 INFO kablam! warning: struct is never constructed: `Res`
Oct 13 00:59:49.723 INFO kablam!  --> src/grep.rs:5:1
Oct 13 00:59:49.723 INFO kablam!   |
Oct 13 00:59:49.724 INFO kablam! 5 | struct Res {
Oct 13 00:59:49.724 INFO kablam!   | ^^^^^^^^^^
Oct 13 00:59:49.724 INFO kablam! 
Oct 13 00:59:49.725 INFO kablam! warning: function is never used: `search_contents`
Oct 13 00:59:49.725 INFO kablam!   --> src/grep.rs:10:1
Oct 13 00:59:49.725 INFO kablam!    |
Oct 13 00:59:49.725 INFO kablam! 10 | fn search_contents(contents: &str, search: &str) -> Vec<Res> {
Oct 13 00:59:49.726 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.726 INFO kablam! 
Oct 13 00:59:49.726 INFO kablam! warning: function is never used: `grep`
Oct 13 00:59:49.726 INFO kablam!   --> src/grep.rs:25:1
Oct 13 00:59:49.727 INFO kablam!    |
Oct 13 00:59:49.727 INFO kablam! 25 | fn grep(filename: &str, search: &str) -> Result<Vec<Res>, Error> {
Oct 13 00:59:49.727 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.727 INFO kablam! 
Oct 13 00:59:49.728 INFO kablam! warning: function is never used: `add_one`
Oct 13 00:59:49.728 INFO kablam!  --> src/closures.rs:1:1
Oct 13 00:59:49.728 INFO kablam!   |
Oct 13 00:59:49.728 INFO kablam! 1 | / fn add_one<F>(closure: F, y: u32) -> u32
Oct 13 00:59:49.729 INFO kablam! 2 | |     where F: Fn(u32) -> u32
Oct 13 00:59:49.729 INFO kablam! 3 | | {
Oct 13 00:59:49.729 INFO kablam! 4 | |     closure(y) + 1
Oct 13 00:59:49.729 INFO kablam! 5 | | }
Oct 13 00:59:49.730 INFO kablam!   | |_^
Oct 13 00:59:49.730 INFO kablam! 
Oct 13 00:59:49.730 INFO kablam! warning: function is never used: `add`
Oct 13 00:59:49.730 INFO kablam!  --> src/closures.rs:7:1
Oct 13 00:59:49.731 INFO kablam!   |
Oct 13 00:59:49.731 INFO kablam! 7 | fn add(x: u32, y: u32) -> u32 {
Oct 13 00:59:49.731 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.731 INFO kablam! 
Oct 13 00:59:49.732 INFO kablam! warning: struct is never constructed: `Even`
Oct 13 00:59:49.736 INFO kablam!   --> src/closures.rs:17:1
Oct 13 00:59:49.736 INFO kablam!    |
Oct 13 00:59:49.737 INFO kablam! 17 | struct Even {
Oct 13 00:59:49.737 INFO kablam!    | ^^^^^^^^^^^
Oct 13 00:59:49.737 INFO kablam! 
Oct 13 00:59:49.737 INFO kablam! warning: struct is never constructed: `Node`
Oct 13 00:59:49.738 INFO kablam!  --> src/tree.rs:5:1
Oct 13 00:59:49.738 INFO kablam!   |
Oct 13 00:59:49.738 INFO kablam! 5 | struct Node {
Oct 13 00:59:49.738 INFO kablam!   | ^^^^^^^^^^^
Oct 13 00:59:49.739 INFO kablam! 
Oct 13 00:59:49.739 INFO kablam! warning: function is never used: `make_tree`
Oct 13 00:59:49.739 INFO kablam!   --> src/tree.rs:11:1
Oct 13 00:59:49.739 INFO kablam!    |
Oct 13 00:59:49.740 INFO kablam! 11 | fn make_tree() {
Oct 13 00:59:49.740 INFO kablam!    | ^^^^^^^^^^^^^^
Oct 13 00:59:49.740 INFO kablam! 
Oct 13 00:59:49.741 INFO kablam! warning: function is never used: `thread1`
Oct 13 00:59:49.741 INFO kablam!  --> src/threads.rs:5:1
Oct 13 00:59:49.741 INFO kablam!   |
Oct 13 00:59:49.741 INFO kablam! 5 | fn thread1() {
Oct 13 00:59:49.742 INFO kablam!   | ^^^^^^^^^^^^
Oct 13 00:59:49.742 INFO kablam! 
Oct 13 00:59:49.742 INFO kablam! warning: function is never used: `channels`
Oct 13 00:59:49.742 INFO kablam!   --> src/threads.rs:17:1
Oct 13 00:59:49.742 INFO kablam!    |
Oct 13 00:59:49.742 INFO kablam! 17 | fn channels() {
Oct 13 00:59:49.742 INFO kablam!    | ^^^^^^^^^^^^^
Oct 13 00:59:49.742 INFO kablam! 
Oct 13 00:59:49.742 INFO kablam! warning: struct is never constructed: `Post`
Oct 13 00:59:49.742 INFO kablam!  --> src/posts.rs:1:1
Oct 13 00:59:49.742 INFO kablam!   |
Oct 13 00:59:49.742 INFO kablam! 1 | struct Post {
Oct 13 00:59:49.743 INFO kablam!   | ^^^^^^^^^^^
Oct 13 00:59:49.743 INFO kablam! 
Oct 13 00:59:49.743 INFO kablam! warning: struct is never constructed: `DraftPost`
Oct 13 00:59:49.743 INFO kablam!  --> src/posts.rs:5:1
Oct 13 00:59:49.743 INFO kablam!   |
Oct 13 00:59:49.743 INFO kablam! 5 | struct DraftPost {
Oct 13 00:59:49.743 INFO kablam!   | ^^^^^^^^^^^^^^^^
Oct 13 00:59:49.743 INFO kablam! 
Oct 13 00:59:49.743 INFO kablam! warning: struct is never constructed: `PendingPost`
Oct 13 00:59:49.743 INFO kablam!  --> src/posts.rs:9:1
Oct 13 00:59:49.743 INFO kablam!   |
Oct 13 00:59:49.743 INFO kablam! 9 | struct PendingPost {
Oct 13 00:59:49.743 INFO kablam!   | ^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.743 INFO kablam! 
Oct 13 00:59:49.745 INFO kablam! warning: method is never used: `new`
Oct 13 00:59:49.745 INFO kablam!   --> src/posts.rs:16:5
Oct 13 00:59:49.745 INFO kablam!    |
Oct 13 00:59:49.745 INFO kablam! 16 |     fn new() -> DraftPost {
Oct 13 00:59:49.745 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.745 INFO kablam! 
Oct 13 00:59:49.745 INFO kablam! warning: method is never used: `content`
Oct 13 00:59:49.745 INFO kablam!   --> src/posts.rs:20:5
Oct 13 00:59:49.745 INFO kablam!    |
Oct 13 00:59:49.745 INFO kablam! 20 |     fn content(&self) -> &str {
Oct 13 00:59:49.745 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.745 INFO kablam! 
Oct 13 00:59:49.745 INFO kablam! warning: method is never used: `req_review`
Oct 13 00:59:49.745 INFO kablam!   --> src/posts.rs:26:5
Oct 13 00:59:49.745 INFO kablam!    |
Oct 13 00:59:49.745 INFO kablam! 26 |     fn req_review(self) -> PendingPost {
Oct 13 00:59:49.745 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.745 INFO kablam! 
Oct 13 00:59:49.746 INFO kablam! warning: method is never used: `add_text`
Oct 13 00:59:49.746 INFO kablam!   --> src/posts.rs:33:5
Oct 13 00:59:49.746 INFO kablam!    |
Oct 13 00:59:49.746 INFO kablam! 33 |     fn add_text(&mut self, content: &str) {
Oct 13 00:59:49.746 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.746 INFO kablam! 
Oct 13 00:59:49.746 INFO kablam! warning: enum is never used: `PublishResult`
Oct 13 00:59:49.746 INFO kablam!   --> src/posts.rs:38:1
Oct 13 00:59:49.746 INFO kablam!    |
Oct 13 00:59:49.746 INFO kablam! 38 | enum PublishResult {
Oct 13 00:59:49.746 INFO kablam!    | ^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.746 INFO kablam! 
Oct 13 00:59:49.746 INFO kablam! warning: method is never used: `approve`
Oct 13 00:59:49.746 INFO kablam!   --> src/posts.rs:44:5
Oct 13 00:59:49.746 INFO kablam!    |
Oct 13 00:59:49.746 INFO kablam! 44 |     fn approve(&mut self) {
Oct 13 00:59:49.746 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.746 INFO kablam! 
Oct 13 00:59:49.746 INFO kablam! warning: method is never used: `reject`
Oct 13 00:59:49.746 INFO kablam!   --> src/posts.rs:47:5
Oct 13 00:59:49.746 INFO kablam!    |
Oct 13 00:59:49.746 INFO kablam! 47 |     fn reject(self) -> DraftPost {
Oct 13 00:59:49.746 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.746 INFO kablam! 
Oct 13 00:59:49.746 INFO kablam! warning: method is never used: `publish`
Oct 13 00:59:49.747 INFO kablam!   --> src/posts.rs:50:5
Oct 13 00:59:49.748 INFO kablam!    |
Oct 13 00:59:49.748 INFO kablam! 50 |     fn publish(self) -> PublishResult {
Oct 13 00:59:49.748 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 13 00:59:49.748 INFO kablam! 
Oct 13 00:59:49.980 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.27s
Oct 13 00:59:49.980 INFO kablam! su: No module specific data is present
Oct 13 00:59:50.923 INFO running `"docker" "rm" "-f" "af7160b7bfe96ae781acf8e399448669f3a1bc05f5e74494fb59c8442a380cfe"`
Oct 13 00:59:51.276 INFO blam! af7160b7bfe96ae781acf8e399448669f3a1bc05f5e74494fb59c8442a380cfe