Dec 19 08:58:25.109 INFO checking shanemikel/rust-hello against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 08:58:25.109 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/shanemikel/rust-hello:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 08:58:25.599 INFO [stdout] 1c351a77d2e5543f2f398db18e2920f685a33a3bd25dfe4d2286726c0ef00c98
Dec 19 08:58:25.606 INFO running `"docker" "start" "-a" "1c351a77d2e5543f2f398db18e2920f685a33a3bd25dfe4d2286726c0ef00c98"`
Dec 19 08:58:27.705 INFO [stderr]     Checking rust-hello v0.1.0 (/opt/crater/workdir)
Dec 19 08:58:28.029 INFO [stderr] warning: unused import: `std::cell::RefCell`
Dec 19 08:58:28.029 INFO [stderr]  --> src/main.rs:8:9
Dec 19 08:58:28.030 INFO [stderr]   |
Dec 19 08:58:28.030 INFO [stderr] 8 |     use std::cell::RefCell;
Dec 19 08:58:28.030 INFO [stderr]   |         ^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.030 INFO [stderr]   |
Dec 19 08:58:28.030 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 08:58:28.030 INFO [stderr] 
Dec 19 08:58:28.030 INFO [stderr] warning: unused import: `Mutex`
Dec 19 08:58:28.030 INFO [stderr]  --> src/main.rs:9:26
Dec 19 08:58:28.030 INFO [stderr]   |
Dec 19 08:58:28.030 INFO [stderr] 9 |     use std::sync::{Arc, Mutex, RwLock};
Dec 19 08:58:28.030 INFO [stderr]   |                          ^^^^^
Dec 19 08:58:28.030 INFO [stderr] 
Dec 19 08:58:28.040 INFO [stderr] warning: unused import: `std::cell::RefCell`
Dec 19 08:58:28.040 INFO [stderr]  --> src/main.rs:8:9
Dec 19 08:58:28.040 INFO [stderr]   |
Dec 19 08:58:28.040 INFO [stderr] 8 |     use std::cell::RefCell;
Dec 19 08:58:28.040 INFO [stderr]   |         ^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.040 INFO [stderr]   |
Dec 19 08:58:28.040 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 08:58:28.040 INFO [stderr] 
Dec 19 08:58:28.040 INFO [stderr] warning: unused import: `Mutex`
Dec 19 08:58:28.040 INFO [stderr]  --> src/main.rs:9:26
Dec 19 08:58:28.040 INFO [stderr]   |
Dec 19 08:58:28.040 INFO [stderr] 9 |     use std::sync::{Arc, Mutex, RwLock};
Dec 19 08:58:28.040 INFO [stderr]   |                          ^^^^^
Dec 19 08:58:28.041 INFO [stderr] 
Dec 19 08:58:28.176 INFO [stderr] warning: unused variable: `data`
Dec 19 08:58:28.176 INFO [stderr]   --> src/main.rs:25:17
Dec 19 08:58:28.176 INFO [stderr]    |
Dec 19 08:58:28.176 INFO [stderr] 25 |             let data = data.read().unwrap();
Dec 19 08:58:28.176 INFO [stderr]    |                 ^^^^ help: consider using `_data` instead
Dec 19 08:58:28.176 INFO [stderr]    |
Dec 19 08:58:28.176 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 08:58:28.176 INFO [stderr] 
Dec 19 08:58:28.188 INFO [stderr] warning: enum is never used: `List`
Dec 19 08:58:28.188 INFO [stderr]  --> src/list.rs:3:1
Dec 19 08:58:28.188 INFO [stderr]   |
Dec 19 08:58:28.188 INFO [stderr] 3 | pub enum List<T> {
Dec 19 08:58:28.188 INFO [stderr]   | ^^^^^^^^^^^^^^^^
Dec 19 08:58:28.188 INFO [stderr]   |
Dec 19 08:58:28.188 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 08:58:28.188 INFO [stderr] 
Dec 19 08:58:28.188 INFO [stderr] warning: method is never used: `new`
Dec 19 08:58:28.188 INFO [stderr]  --> src/list.rs:9:5
Dec 19 08:58:28.188 INFO [stderr]   |
Dec 19 08:58:28.188 INFO [stderr] 9 |     pub fn new() -> List<T> { List::Nil }
Dec 19 08:58:28.188 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.188 INFO [stderr] 
Dec 19 08:58:28.188 INFO [stderr] warning: method is never used: `cons`
Dec 19 08:58:28.188 INFO [stderr]   --> src/list.rs:11:5
Dec 19 08:58:28.188 INFO [stderr]    |
Dec 19 08:58:28.188 INFO [stderr] 11 |     pub fn cons(self, x: T) -> List<T> { List::Cons(x, Box::new(self)) }
Dec 19 08:58:28.189 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.189 INFO [stderr] 
Dec 19 08:58:28.189 INFO [stderr] warning: method is never used: `head`
Dec 19 08:58:28.189 INFO [stderr]   --> src/list.rs:13:5
Dec 19 08:58:28.189 INFO [stderr]    |
Dec 19 08:58:28.189 INFO [stderr] 13 |     pub fn head(self) -> Option<T> {
Dec 19 08:58:28.189 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.189 INFO [stderr] 
Dec 19 08:58:28.189 INFO [stderr] warning: method is never used: `tail`
Dec 19 08:58:28.189 INFO [stderr]   --> src/list.rs:20:5
Dec 19 08:58:28.189 INFO [stderr]    |
Dec 19 08:58:28.189 INFO [stderr] 20 |     pub fn tail(&self) -> Option<&List<T>> {
Dec 19 08:58:28.189 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.189 INFO [stderr] 
Dec 19 08:58:28.189 INFO [stderr] warning: method is never used: `head_ref`
Dec 19 08:58:28.189 INFO [stderr]   --> src/list.rs:29:5
Dec 19 08:58:28.189 INFO [stderr]    |
Dec 19 08:58:28.189 INFO [stderr] 29 |     pub fn head_ref(&self) -> Option<T> {
Dec 19 08:58:28.189 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.189 INFO [stderr] 
Dec 19 08:58:28.189 INFO [stderr] warning: constant item is never used: `N`
Dec 19 08:58:28.189 INFO [stderr]   --> src/main.rs:13:5
Dec 19 08:58:28.189 INFO [stderr]    |
Dec 19 08:58:28.189 INFO [stderr] 13 |     const N: usize = 10;
Dec 19 08:58:28.189 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.189 INFO [stderr] 
Dec 19 08:58:28.189 INFO [stderr] warning: function is never used: `test_list`
Dec 19 08:58:28.189 INFO [stderr]   --> src/main.rs:39:1
Dec 19 08:58:28.189 INFO [stderr]    |
Dec 19 08:58:28.189 INFO [stderr] 39 | fn test_list() {
Dec 19 08:58:28.189 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 19 08:58:28.189 INFO [stderr] 
Dec 19 08:58:28.248 INFO [stderr] warning: unused variable: `data`
Dec 19 08:58:28.248 INFO [stderr]   --> src/main.rs:25:17
Dec 19 08:58:28.248 INFO [stderr]    |
Dec 19 08:58:28.248 INFO [stderr] 25 |             let data = data.read().unwrap();
Dec 19 08:58:28.248 INFO [stderr]    |                 ^^^^ help: consider using `_data` instead
Dec 19 08:58:28.248 INFO [stderr]    |
Dec 19 08:58:28.248 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 08:58:28.248 INFO [stderr] 
Dec 19 08:58:28.272 INFO [stderr] warning: enum is never used: `List`
Dec 19 08:58:28.272 INFO [stderr]  --> src/list.rs:3:1
Dec 19 08:58:28.272 INFO [stderr]   |
Dec 19 08:58:28.272 INFO [stderr] 3 | pub enum List<T> {
Dec 19 08:58:28.272 INFO [stderr]   | ^^^^^^^^^^^^^^^^
Dec 19 08:58:28.272 INFO [stderr]   |
Dec 19 08:58:28.272 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 08:58:28.272 INFO [stderr] 
Dec 19 08:58:28.272 INFO [stderr] warning: method is never used: `new`
Dec 19 08:58:28.272 INFO [stderr]  --> src/list.rs:9:5
Dec 19 08:58:28.272 INFO [stderr]   |
Dec 19 08:58:28.272 INFO [stderr] 9 |     pub fn new() -> List<T> { List::Nil }
Dec 19 08:58:28.272 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.272 INFO [stderr] 
Dec 19 08:58:28.272 INFO [stderr] warning: method is never used: `cons`
Dec 19 08:58:28.272 INFO [stderr]   --> src/list.rs:11:5
Dec 19 08:58:28.272 INFO [stderr]    |
Dec 19 08:58:28.272 INFO [stderr] 11 |     pub fn cons(self, x: T) -> List<T> { List::Cons(x, Box::new(self)) }
Dec 19 08:58:28.273 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.273 INFO [stderr] 
Dec 19 08:58:28.273 INFO [stderr] warning: method is never used: `head`
Dec 19 08:58:28.273 INFO [stderr]   --> src/list.rs:13:5
Dec 19 08:58:28.273 INFO [stderr]    |
Dec 19 08:58:28.273 INFO [stderr] 13 |     pub fn head(self) -> Option<T> {
Dec 19 08:58:28.273 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.273 INFO [stderr] 
Dec 19 08:58:28.273 INFO [stderr] warning: method is never used: `tail`
Dec 19 08:58:28.273 INFO [stderr]   --> src/list.rs:20:5
Dec 19 08:58:28.273 INFO [stderr]    |
Dec 19 08:58:28.273 INFO [stderr] 20 |     pub fn tail(&self) -> Option<&List<T>> {
Dec 19 08:58:28.273 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.273 INFO [stderr] 
Dec 19 08:58:28.273 INFO [stderr] warning: method is never used: `head_ref`
Dec 19 08:58:28.273 INFO [stderr]   --> src/list.rs:29:5
Dec 19 08:58:28.273 INFO [stderr]    |
Dec 19 08:58:28.273 INFO [stderr] 29 |     pub fn head_ref(&self) -> Option<T> {
Dec 19 08:58:28.273 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.273 INFO [stderr] 
Dec 19 08:58:28.273 INFO [stderr] warning: constant item is never used: `N`
Dec 19 08:58:28.273 INFO [stderr]   --> src/main.rs:13:5
Dec 19 08:58:28.273 INFO [stderr]    |
Dec 19 08:58:28.273 INFO [stderr] 13 |     const N: usize = 10;
Dec 19 08:58:28.273 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
Dec 19 08:58:28.273 INFO [stderr] 
Dec 19 08:58:28.273 INFO [stderr] warning: function is never used: `test_list`
Dec 19 08:58:28.273 INFO [stderr]   --> src/main.rs:39:1
Dec 19 08:58:28.273 INFO [stderr]    |
Dec 19 08:58:28.273 INFO [stderr] 39 | fn test_list() {
Dec 19 08:58:28.273 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 19 08:58:28.273 INFO [stderr] 
Dec 19 08:58:28.308 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.65s
Dec 19 08:58:29.502 INFO running `"docker" "inspect" "1c351a77d2e5543f2f398db18e2920f685a33a3bd25dfe4d2286726c0ef00c98"`
Dec 19 08:58:29.802 INFO running `"docker" "rm" "-f" "1c351a77d2e5543f2f398db18e2920f685a33a3bd25dfe4d2286726c0ef00c98"`
Dec 19 08:58:30.220 INFO [stdout] 1c351a77d2e5543f2f398db18e2920f685a33a3bd25dfe4d2286726c0ef00c98