[INFO] updating cached repository https://github.com/clD11/rust-katas
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e65cf2a85e680f4e76e17172762eb02033131937
[INFO] checking clD11/rust-katas against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FclD11%2Frust-katas" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/clD11/rust-katas on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/clD11/rust-katas
[INFO] finished tweaking git repo https://github.com/clD11/rust-katas
[INFO] tweaked toml for git repo https://github.com/clD11/rust-katas written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/clD11/rust-katas already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 030fa10d6d05ca6cbc40ba218d4b63e2a96eca451f23f8d05191ef7a7acd97e0
[INFO] running `"docker" "start" "-a" "030fa10d6d05ca6cbc40ba218d4b63e2a96eca451f23f8d05191ef7a7acd97e0"`
[INFO] [stderr]     Checking rust-katas v0.1.0 (/opt/rustwide/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 = $attr_default:expr ),*
[INFO] [stderr] 12 | |     }) => {
[INFO] [stderr] ...  |
[INFO] [stderr] 49 | |     }
[INFO] [stderr] 50 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable if-let pattern
[INFO] [stderr]   --> src/defining_enums.rs:9:5
[INFO] [stderr]    |
[INFO] [stderr] 9  | /     if let IpAddrKind::V4(actual) = V4 {
[INFO] [stderr] 10 | |         assert_eq!(actual, expected);
[INFO] [stderr] 11 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::string::String`
[INFO] [stderr]  --> src/slice.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::string::String;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]  --> src/macros.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | / macro_rules! add_one {
[INFO] [stderr] 2 | |     // rule
[INFO] [stderr] 3 | |     ($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 `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] 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: 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 1.22s
[INFO] running `"docker" "inspect" "030fa10d6d05ca6cbc40ba218d4b63e2a96eca451f23f8d05191ef7a7acd97e0"`
[INFO] running `"docker" "rm" "-f" "030fa10d6d05ca6cbc40ba218d4b63e2a96eca451f23f8d05191ef7a7acd97e0"`
[INFO] [stdout] 030fa10d6d05ca6cbc40ba218d4b63e2a96eca451f23f8d05191ef7a7acd97e0