[INFO] updating cached repository 11/LearnRust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/11/LearnRust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/11/LearnRust" "work/ex/beta-1.38-1/sources/1.37.0/gh/11/LearnRust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/11/LearnRust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/11/LearnRust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/11/LearnRust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/11/LearnRust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0b3b5c72c9417c7fd1abebc6b654d5c8aef5d43b
[INFO] sha for GitHub repo 11/LearnRust: 0b3b5c72c9417c7fd1abebc6b654d5c8aef5d43b
[INFO] validating manifest of 11/LearnRust on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of 11/LearnRust on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing 11/LearnRust
[INFO] finished frobbing 11/LearnRust
[INFO] frobbed toml for 11/LearnRust written to work/ex/beta-1.38-1/sources/1.37.0/gh/11/LearnRust/Cargo.toml
[INFO] started frobbing 11/LearnRust
[INFO] finished frobbing 11/LearnRust
[INFO] frobbed toml for 11/LearnRust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/11/LearnRust/Cargo.toml
[INFO] crate 11/LearnRust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing 11/LearnRust against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/11/LearnRust:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] acf935b1211c143222be0d8c3c1c1b26e4b81be7d269100253f99b6bb3415fe7
[INFO] running `"docker" "start" "-a" "acf935b1211c143222be0d8c3c1c1b26e4b81be7d269100253f99b6bb3415fe7"`
[INFO] [stderr]    Compiling learn_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/chapter3.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Book`
[INFO] [stderr]    --> src/chapter3.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 |     struct Book {
[INFO] [stderr]     |     ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/chapter3.rs:128:9
[INFO] [stderr]     |
[INFO] [stderr] 128 |         fn new(access_num: i32, author: &str, title: &str, is_issued: bool) -> Self {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `"docker" "inspect" "acf935b1211c143222be0d8c3c1c1b26e4b81be7d269100253f99b6bb3415fe7"`
[INFO] running `"docker" "rm" "-f" "acf935b1211c143222be0d8c3c1c1b26e4b81be7d269100253f99b6bb3415fe7"`
[INFO] [stdout] acf935b1211c143222be0d8c3c1c1b26e4b81be7d269100253f99b6bb3415fe7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/11/LearnRust:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 80d2794bee5c2b55a97cb1139fe6ec41178f84e67617eb0c2909f5a7acfc2133
[INFO] running `"docker" "start" "-a" "80d2794bee5c2b55a97cb1139fe6ec41178f84e67617eb0c2909f5a7acfc2133"`
[INFO] [stderr]    Compiling learn_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/chapter3.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Book`
[INFO] [stderr]    --> src/chapter3.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 |     struct Book {
[INFO] [stderr]     |     ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/chapter3.rs:128:9
[INFO] [stderr]     |
[INFO] [stderr] 128 |         fn new(access_num: i32, author: &str, title: &str, is_issued: bool) -> Self {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `"docker" "inspect" "80d2794bee5c2b55a97cb1139fe6ec41178f84e67617eb0c2909f5a7acfc2133"`
[INFO] running `"docker" "rm" "-f" "80d2794bee5c2b55a97cb1139fe6ec41178f84e67617eb0c2909f5a7acfc2133"`
[INFO] [stdout] 80d2794bee5c2b55a97cb1139fe6ec41178f84e67617eb0c2909f5a7acfc2133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/11/LearnRust:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 627e3e52afb5ec45ebe7579b29b91742cb03d215c9ad0dd4f97d299037360b99
[INFO] running `"docker" "start" "-a" "627e3e52afb5ec45ebe7579b29b91742cb03d215c9ad0dd4f97d299037360b99"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/learn_rust-23f963aacb2868ce
[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" "627e3e52afb5ec45ebe7579b29b91742cb03d215c9ad0dd4f97d299037360b99"`
[INFO] running `"docker" "rm" "-f" "627e3e52afb5ec45ebe7579b29b91742cb03d215c9ad0dd4f97d299037360b99"`
[INFO] [stdout] 627e3e52afb5ec45ebe7579b29b91742cb03d215c9ad0dd4f97d299037360b99