[INFO] updating cached repository k-masatany/rust_self_study
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/k-masatany/rust_self_study
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/k-masatany/rust_self_study" "work/ex/beta-1.37-6/sources/1.36.0/gh/k-masatany/rust_self_study"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/k-masatany/rust_self_study'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/k-masatany/rust_self_study" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/k-masatany/rust_self_study"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/k-masatany/rust_self_study'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9a126d196e01f54ce7638a89a1d552dbd4825c2a
[INFO] sha for GitHub repo k-masatany/rust_self_study: 9a126d196e01f54ce7638a89a1d552dbd4825c2a
[INFO] validating manifest of k-masatany/rust_self_study on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of k-masatany/rust_self_study on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing k-masatany/rust_self_study
[INFO] finished frobbing k-masatany/rust_self_study
[INFO] frobbed toml for k-masatany/rust_self_study written to work/ex/beta-1.37-6/sources/1.36.0/gh/k-masatany/rust_self_study/Cargo.toml
[INFO] started frobbing k-masatany/rust_self_study
[INFO] finished frobbing k-masatany/rust_self_study
[INFO] frobbed toml for k-masatany/rust_self_study written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/k-masatany/rust_self_study/Cargo.toml
[INFO] crate k-masatany/rust_self_study already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing k-masatany/rust_self_study against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/k-masatany/rust_self_study:/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=warn" "-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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] ad6d38a5105b5c7d3fc8814ebacb48e55ae8ef08231a52c47d617c68fdb10134
[INFO] running `"docker" "start" "-a" "ad6d38a5105b5c7d3fc8814ebacb48e55ae8ef08231a52c47d617c68fdb10134"`
[INFO] [stderr]    Compiling rust_self_study v0.1.0 (/opt/crater/workdir)
[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: consider prefixing 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:1:1
[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:5:1
[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:1:1
[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:5:1
[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:1:1
[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:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn tail_largest_prime_factor(n: u64, lpf: u64, att: u64) -> u64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `"docker" "inspect" "ad6d38a5105b5c7d3fc8814ebacb48e55ae8ef08231a52c47d617c68fdb10134"`
[INFO] running `"docker" "rm" "-f" "ad6d38a5105b5c7d3fc8814ebacb48e55ae8ef08231a52c47d617c68fdb10134"`
[INFO] [stdout] ad6d38a5105b5c7d3fc8814ebacb48e55ae8ef08231a52c47d617c68fdb10134
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/k-masatany/rust_self_study:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] ca27e1bd8088cd494a10eb863ffde85fa6ba264dc0a29198eb6e81dfaa68c083
[INFO] running `"docker" "start" "-a" "ca27e1bd8088cd494a10eb863ffde85fa6ba264dc0a29198eb6e81dfaa68c083"`
[INFO] [stderr]    Compiling rust_self_study v0.1.0 (/opt/crater/workdir)
[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: consider prefixing 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:1:1
[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:5:1
[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:1:1
[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:5:1
[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:1:1
[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:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn tail_largest_prime_factor(n: u64, lpf: u64, att: u64) -> u64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "ca27e1bd8088cd494a10eb863ffde85fa6ba264dc0a29198eb6e81dfaa68c083"`
[INFO] running `"docker" "rm" "-f" "ca27e1bd8088cd494a10eb863ffde85fa6ba264dc0a29198eb6e81dfaa68c083"`
[INFO] [stdout] ca27e1bd8088cd494a10eb863ffde85fa6ba264dc0a29198eb6e81dfaa68c083
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/k-masatany/rust_self_study:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 364924db5fa73b67bf44f7c58612bf5c7f6c1fb664974f841220be7a398a363c
[INFO] running `"docker" "start" "-a" "364924db5fa73b67bf44f7c58612bf5c7f6c1fb664974f841220be7a398a363c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_self_study-c9fd0f66fd9f0be3
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "364924db5fa73b67bf44f7c58612bf5c7f6c1fb664974f841220be7a398a363c"`
[INFO] running `"docker" "rm" "-f" "364924db5fa73b67bf44f7c58612bf5c7f6c1fb664974f841220be7a398a363c"`
[INFO] [stdout] 364924db5fa73b67bf44f7c58612bf5c7f6c1fb664974f841220be7a398a363c