[INFO] updating cached repository https://github.com/steshaw/rustlings
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 06b46229ca0dd5b5fb874746d6ace8665151b11f
[INFO] testing steshaw/rustlings against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteshaw%2Frustlings" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/steshaw/rustlings on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/steshaw/rustlings
[INFO] finished tweaking git repo https://github.com/steshaw/rustlings
[INFO] tweaked toml for git repo https://github.com/steshaw/rustlings written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/steshaw/rustlings already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stdout] 6d29918c4d0bc68052ba35c36d105875b25be78aab7b2752bd9985ec5b304c74
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "6d29918c4d0bc68052ba35c36d105875b25be78aab7b2752bd9985ec5b304c74"`
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling serde v1.0.92
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling regex-syntax v0.6.6
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling aho-corasick v0.7.3
[INFO] [stderr]    Compiling aho-corasick v0.6.10
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling termios v0.3.1
[INFO] [stderr]    Compiling inotify-sys v0.1.3
[INFO] [stderr]    Compiling clicolors-control v1.0.0
[INFO] [stderr]    Compiling filetime v0.2.5
[INFO] [stderr]    Compiling clicolors-control v0.2.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling inotify v0.6.1
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling regex v1.1.6
[INFO] [stderr]    Compiling notify v4.0.12
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]    Compiling console v0.7.5
[INFO] [stderr]    Compiling console v0.6.2
[INFO] [stderr]    Compiling indicatif v0.9.0
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling rustlings v2.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 35s
[INFO] running `"docker" "inspect" "6d29918c4d0bc68052ba35c36d105875b25be78aab7b2752bd9985ec5b304c74"`
[INFO] running `"docker" "rm" "-f" "6d29918c4d0bc68052ba35c36d105875b25be78aab7b2752bd9985ec5b304c74"`
[INFO] [stdout] 6d29918c4d0bc68052ba35c36d105875b25be78aab7b2752bd9985ec5b304c74
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7337ea1f00d19883ee03d29d2421f23ac0408929913f636226918d4bb551b895
[INFO] running `"docker" "start" "-a" "7337ea1f00d19883ee03d29d2421f23ac0408929913f636226918d4bb551b895"`
[INFO] [stderr]    Compiling ryu v0.2.8
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]    Compiling predicates-core v1.0.0
[INFO] [stderr]    Compiling treeline v0.1.0
[INFO] [stderr]    Compiling normalize-line-endings v0.2.2
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling predicates-tree v1.0.0
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling float-cmp v0.4.0
[INFO] [stderr]    Compiling predicates v1.0.1
[INFO] [stderr]    Compiling assert_cmd v0.11.1
[INFO] [stderr]    Compiling rustlings v2.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variant is never constructed: `Negative`
[INFO] [stderr]   --> examples/result1.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     Negative,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Zero`
[INFO] [stderr]   --> examples/result1.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Zero,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> examples/result1.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new(value: i64) -> Result<PositiveNonzeroInteger, CreationError> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Message`
[INFO] [stderr]  --> examples/enums3.rs:6:6
[INFO] [stderr]   |
[INFO] [stderr] 6 | enum Message {
[INFO] [stderr]   |      ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `State`
[INFO] [stderr]   --> examples/enums3.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 | struct State {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `change_color`
[INFO] [stderr]   --> examples/enums3.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn change_color(&mut self, color: (u8, u8, u8)) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `quit`
[INFO] [stderr]   --> examples/enums3.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn quit(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `echo`
[INFO] [stderr]   --> examples/enums3.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn echo(&self, s: String) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `move_position`
[INFO] [stderr]   --> examples/enums3.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn move_position(&mut self, p: Point) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process`
[INFO] [stderr]   --> examples/enums3.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     fn process(&mut self, message: Message) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fact_recursive`
[INFO] [stderr]  --> examples/iterators4.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn fact_recursive(n: u64) -> u64 {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fact_fold`
[INFO] [stderr]   --> examples/iterators4.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn fact_fold(n: u64) -> u64 {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]    --> examples/errorsn.rs:113:49
[INFO] [stderr]     |
[INFO] [stderr] 113 |         f.write_str((self as &dyn error::Error).description())
[INFO] [stderr]     |                                                 ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `test3`
[INFO] [stderr]   --> examples/test3.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | / pub fn times_two(num: i32) -> i32 {
[INFO] [stderr] 11 | |     num * 2
[INFO] [stderr] 12 | | }
[INFO] [stderr] 13 | |
[INFO] [stderr] ...  |
[INFO] [stderr] 26 | |     }
[INFO] [stderr] 27 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `examples/test3.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: could not compile `rustlings`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "7337ea1f00d19883ee03d29d2421f23ac0408929913f636226918d4bb551b895"`
[INFO] running `"docker" "rm" "-f" "7337ea1f00d19883ee03d29d2421f23ac0408929913f636226918d4bb551b895"`
[INFO] [stdout] 7337ea1f00d19883ee03d29d2421f23ac0408929913f636226918d4bb551b895