[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] checking k-masatany/rust_self_study against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fk-masatany%2Frust_self_study" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/k-masatany/rust_self_study on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", 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-12/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" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e86a6b544938fdab49052c62f51865c5a395358fa91f589d30f2d14129bebef0
[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" "e86a6b544938fdab49052c62f51865c5a395358fa91f589d30f2d14129bebef0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e86a6b544938fdab49052c62f51865c5a395358fa91f589d30f2d14129bebef0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e86a6b544938fdab49052c62f51865c5a395358fa91f589d30f2d14129bebef0", kill_on_drop: false }`
[INFO] [stdout] e86a6b544938fdab49052c62f51865c5a395358fa91f589d30f2d14129bebef0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=forbid" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b38f37e5d280be1aaa81426edefbea27324d9cddd317f074ede086ca4567142
[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" "0b38f37e5d280be1aaa81426edefbea27324d9cddd317f074ede086ca4567142", kill_on_drop: false }`
[INFO] [stderr]     Checking 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: 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: 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: 8 warnings emitted
[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 0.57s
[INFO] running `Command { std: "docker" "inspect" "0b38f37e5d280be1aaa81426edefbea27324d9cddd317f074ede086ca4567142", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b38f37e5d280be1aaa81426edefbea27324d9cddd317f074ede086ca4567142", kill_on_drop: false }`
[INFO] [stdout] 0b38f37e5d280be1aaa81426edefbea27324d9cddd317f074ede086ca4567142