[INFO] updating cached repository clD11/rust-katas
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/clD11/rust-katas
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/clD11/rust-katas" "work/ex/beta-1.38-1/sources/1.37.0/gh/clD11/rust-katas"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/clD11/rust-katas'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/clD11/rust-katas" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/clD11/rust-katas"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/clD11/rust-katas'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e65cf2a85e680f4e76e17172762eb02033131937
[INFO] sha for GitHub repo clD11/rust-katas: e65cf2a85e680f4e76e17172762eb02033131937
[INFO] validating manifest of clD11/rust-katas 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 clD11/rust-katas 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 clD11/rust-katas
[INFO] finished frobbing clD11/rust-katas
[INFO] frobbed toml for clD11/rust-katas written to work/ex/beta-1.38-1/sources/1.37.0/gh/clD11/rust-katas/Cargo.toml
[INFO] started frobbing clD11/rust-katas
[INFO] finished frobbing clD11/rust-katas
[INFO] frobbed toml for clD11/rust-katas written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/clD11/rust-katas/Cargo.toml
[INFO] crate clD11/rust-katas 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 clD11/rust-katas 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/clD11/rust-katas:/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] 22a41ad6bf4c0ea365fa13761f93de30837bc8022baefd74823ee238b8f43373
[INFO] running `"docker" "start" "-a" "22a41ad6bf4c0ea365fa13761f93de30837bc8022baefd74823ee238b8f43373"`
[INFO] [stderr]    Compiling rust-katas v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::string::String`
[INFO] [stderr]  --> src/slice.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::string::String;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]  --> src/macros.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | / macro_rules! add_one {
[INFO] [stderr] 2 | |     // rule
[INFO] [stderr] 3 | |     ($input:expr) => { $input + 1 } // expansion
[INFO] [stderr] 4 | | }
[INFO] [stderr]   | |_^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/macros.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | / macro_rules! def_builder {
[INFO] [stderr] 10 | |     ( $src_name:ident => $dest_name:ident {
[INFO] [stderr] 11 | |         $( $attr_name:ident : $attr_type:ty = $attr_default:expr ),*
[INFO] [stderr] 12 | |     }) => {
[INFO] [stderr] ...  |
[INFO] [stderr] 49 | |     }
[INFO] [stderr] 50 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_first_word`
[INFO] [stderr]  --> src/slice.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn find_first_word(s: &str) -> &str {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Rectangle`
[INFO] [stderr]  --> src/rectangle.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct Rectangle {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `square`
[INFO] [stderr]   --> src/rectangle.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn square(d: i32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `area`
[INFO] [stderr]   --> src/rectangle.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn area(&self) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/rectangle.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn can_hold(&self, rectangle: &Rectangle) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `IpAddrKind`
[INFO] [stderr]  --> src/defining_enums.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | enum IpAddrKind {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.89s
[INFO] running `"docker" "inspect" "22a41ad6bf4c0ea365fa13761f93de30837bc8022baefd74823ee238b8f43373"`
[INFO] running `"docker" "rm" "-f" "22a41ad6bf4c0ea365fa13761f93de30837bc8022baefd74823ee238b8f43373"`
[INFO] [stdout] 22a41ad6bf4c0ea365fa13761f93de30837bc8022baefd74823ee238b8f43373
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/clD11/rust-katas:/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] fb450bd6332b89acfc8a31c90c024841bc206976b0c17437f8d7e6b8280e9c60
[INFO] running `"docker" "start" "-a" "fb450bd6332b89acfc8a31c90c024841bc206976b0c17437f8d7e6b8280e9c60"`
[INFO] [stderr]    Compiling rust-katas v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/macros.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | / macro_rules! def_builder {
[INFO] [stderr] 10 | |     ( $src_name:ident => $dest_name:ident {
[INFO] [stderr] 11 | |         $( $attr_name:ident : $attr_type:ty = $attr_default:expr ),*
[INFO] [stderr] 12 | |     }) => {
[INFO] [stderr] ...  |
[INFO] [stderr] 49 | |     }
[INFO] [stderr] 50 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable if-let pattern
[INFO] [stderr]   --> src/defining_enums.rs:9:5
[INFO] [stderr]    |
[INFO] [stderr] 9  | /     if let IpAddrKind::V4(actual) = V4 {
[INFO] [stderr] 10 | |         assert_eq!(actual, expected);
[INFO] [stderr] 11 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(irrefutable_let_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_V4` should have a snake case name
[INFO] [stderr]  --> src/defining_enums.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn test_V4() {
[INFO] [stderr]   |    ^^^^^^^ help: convert the identifier to snake case: `test_v4`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `V4` should have a snake case name
[INFO] [stderr]  --> src/defining_enums.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let V4 = IpAddrKind::V4(String::from("127.0.0.1"));
[INFO] [stderr]   |         ^^ help: convert the identifier to snake case: `v4`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `"docker" "inspect" "fb450bd6332b89acfc8a31c90c024841bc206976b0c17437f8d7e6b8280e9c60"`
[INFO] running `"docker" "rm" "-f" "fb450bd6332b89acfc8a31c90c024841bc206976b0c17437f8d7e6b8280e9c60"`
[INFO] [stdout] fb450bd6332b89acfc8a31c90c024841bc206976b0c17437f8d7e6b8280e9c60
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/clD11/rust-katas:/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] 4cf96603bd3d88616402632a9f46f01fa96435080b231ec4ab9b8eb7ffb4f276
[INFO] running `"docker" "start" "-a" "4cf96603bd3d88616402632a9f46f01fa96435080b231ec4ab9b8eb7ffb4f276"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_katas-23391e93b349cd9b
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test slice::should_return_first_word ... ok
[INFO] [stdout] test slice::should_return_whole_string ... ok
[INFO] [stdout] test rectangle::create_square ... ok
[INFO] [stdout] test rectangle::can_hold ... ok
[INFO] [stdout] test rectangle::calculate_area ... ok
[INFO] [stdout] test macros::test_builder_macro ... ok
[INFO] [stdout] test macros::builder_test ... ok
[INFO] [stdout] test defining_enums::test_V4 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "4cf96603bd3d88616402632a9f46f01fa96435080b231ec4ab9b8eb7ffb4f276"`
[INFO] running `"docker" "rm" "-f" "4cf96603bd3d88616402632a9f46f01fa96435080b231ec4ab9b8eb7ffb4f276"`
[INFO] [stdout] 4cf96603bd3d88616402632a9f46f01fa96435080b231ec4ab9b8eb7ffb4f276