[INFO] cloning repository https://github.com/k-masatany/rust_self_study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/k-masatany/rust_self_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-masatany%2Frust_self_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-masatany%2Frust_self_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9a126d196e01f54ce7638a89a1d552dbd4825c2a
[INFO] testing k-masatany/rust_self_study against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-masatany%2Frust_self_study" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/k-masatany/rust_self_study on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/k-masatany/rust_self_study
[INFO] finished tweaking git repo https://github.com/k-masatany/rust_self_study
[INFO] tweaked toml for git repo https://github.com/k-masatany/rust_self_study written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/k-masatany/rust_self_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bbbd1617839ee1c1994ded1ff12f6efccdfadbf12edf9d0a7f1c7b0791827b4f
[INFO] running `Command { std: "docker" "start" "-a" "bbbd1617839ee1c1994ded1ff12f6efccdfadbf12edf9d0a7f1c7b0791827b4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbbd1617839ee1c1994ded1ff12f6efccdfadbf12edf9d0a7f1c7b0791827b4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbbd1617839ee1c1994ded1ff12f6efccdfadbf12edf9d0a7f1c7b0791827b4f", kill_on_drop: false }`
[INFO] [stdout] bbbd1617839ee1c1994ded1ff12f6efccdfadbf12edf9d0a7f1c7b0791827b4f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4eaec34842cb30b528ccca19622115d1d415e9794c5a23de84b7d9b5650b8b79
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4eaec34842cb30b528ccca19622115d1d415e9794c5a23de84b7d9b5650b8b79", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_self_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         try!(io::stdin().read_line(&mut buffer));
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let n = buffer.trim().parse::<u64>().unwrap();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiples_of_3_and_5`
[INFO] [stdout]  --> src/problems/prob1.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn multiples_of_3_and_5(n: u32) -> u64{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tail_multiples_of_3_and_5`
[INFO] [stdout]  --> src/problems/prob1.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn tail_multiples_of_3_and_5(n: u32, att: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `even_fibonacci_numbers`
[INFO] [stdout]  --> src/problems/prob2.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn even_fibonacci_numbers(lim: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tail_even_fibonacci_numbers`
[INFO] [stdout]  --> src/problems/prob2.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn tail_even_fibonacci_numbers(lim: u64, current: u64, before: u64, att: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_prime_factor`
[INFO] [stdout]  --> src/problems/prob3.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn largest_prime_factor(n: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tail_largest_prime_factor`
[INFO] [stdout]  --> src/problems/prob3.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn tail_largest_prime_factor(n: u64, lpf: u64, att: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.22s
[INFO] running `Command { std: "docker" "inspect" "4eaec34842cb30b528ccca19622115d1d415e9794c5a23de84b7d9b5650b8b79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4eaec34842cb30b528ccca19622115d1d415e9794c5a23de84b7d9b5650b8b79", kill_on_drop: false }`
[INFO] [stdout] 4eaec34842cb30b528ccca19622115d1d415e9794c5a23de84b7d9b5650b8b79
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c048d89d30e2831acb1186e4a09985b3da90952d86ebea2bc1d8619504611dcd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c048d89d30e2831acb1186e4a09985b3da90952d86ebea2bc1d8619504611dcd", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_self_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         try!(io::stdin().read_line(&mut buffer));
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let n = buffer.trim().parse::<u64>().unwrap();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiples_of_3_and_5`
[INFO] [stdout]  --> src/problems/prob1.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn multiples_of_3_and_5(n: u32) -> u64{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tail_multiples_of_3_and_5`
[INFO] [stdout]  --> src/problems/prob1.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn tail_multiples_of_3_and_5(n: u32, att: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `even_fibonacci_numbers`
[INFO] [stdout]  --> src/problems/prob2.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn even_fibonacci_numbers(lim: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tail_even_fibonacci_numbers`
[INFO] [stdout]  --> src/problems/prob2.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn tail_even_fibonacci_numbers(lim: u64, current: u64, before: u64, att: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest_prime_factor`
[INFO] [stdout]  --> src/problems/prob3.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn largest_prime_factor(n: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tail_largest_prime_factor`
[INFO] [stdout]  --> src/problems/prob3.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn tail_largest_prime_factor(n: u64, lpf: u64, att: u64) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.90s
[INFO] running `Command { std: "docker" "inspect" "c048d89d30e2831acb1186e4a09985b3da90952d86ebea2bc1d8619504611dcd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c048d89d30e2831acb1186e4a09985b3da90952d86ebea2bc1d8619504611dcd", kill_on_drop: false }`
[INFO] [stdout] c048d89d30e2831acb1186e4a09985b3da90952d86ebea2bc1d8619504611dcd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 748c5338cc6242d160b4bd13dab7cdb1bf75ad352bc7d56ef7a2aadcdc1e7f79
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "748c5338cc6242d160b4bd13dab7cdb1bf75ad352bc7d56ef7a2aadcdc1e7f79", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         try!(io::stdin().read_line(&mut buffer));
[INFO] [stderr]    |         ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]  --> src/main.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let n = buffer.trim().parse::<u64>().unwrap();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `multiples_of_3_and_5`
[INFO] [stderr]  --> src/problems/prob1.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn multiples_of_3_and_5(n: u32) -> u64{
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tail_multiples_of_3_and_5`
[INFO] [stderr]  --> src/problems/prob1.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn tail_multiples_of_3_and_5(n: u32, att: u64) -> u64 {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `even_fibonacci_numbers`
[INFO] [stderr]  --> src/problems/prob2.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn even_fibonacci_numbers(lim: u64) -> u64 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tail_even_fibonacci_numbers`
[INFO] [stderr]  --> src/problems/prob2.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn tail_even_fibonacci_numbers(lim: u64, current: u64, before: u64, att: u64) -> u64 {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest_prime_factor`
[INFO] [stderr]  --> src/problems/prob3.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn largest_prime_factor(n: u64) -> u64 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tail_largest_prime_factor`
[INFO] [stderr]  --> src/problems/prob3.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn tail_largest_prime_factor(n: u64, lpf: u64, att: u64) -> u64 {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_self_study` (bin "rust_self_study" test) generated 8 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_self_study-9fb3564b581e606d)
[INFO] running `Command { std: "docker" "inspect" "748c5338cc6242d160b4bd13dab7cdb1bf75ad352bc7d56ef7a2aadcdc1e7f79", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "748c5338cc6242d160b4bd13dab7cdb1bf75ad352bc7d56ef7a2aadcdc1e7f79", kill_on_drop: false }`
[INFO] [stdout] 748c5338cc6242d160b4bd13dab7cdb1bf75ad352bc7d56ef7a2aadcdc1e7f79