[INFO] cloning repository https://github.com/hugo-belloc/annoying-tower-of-hanoi
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hugo-belloc/annoying-tower-of-hanoi" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhugo-belloc%2Fannoying-tower-of-hanoi", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhugo-belloc%2Fannoying-tower-of-hanoi'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2b5f0d8b3051c7e71a676e49f073a52b7695f171
[INFO] checking hugo-belloc/annoying-tower-of-hanoi against try#af54b6062f33b99e418444700f3a823ef0214052 for pr-138952
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhugo-belloc%2Fannoying-tower-of-hanoi" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hugo-belloc/annoying-tower-of-hanoi on toolchain af54b6062f33b99e418444700f3a823ef0214052
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af54b6062f33b99e418444700f3a823ef0214052" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hugo-belloc/annoying-tower-of-hanoi
[INFO] finished tweaking git repo https://github.com/hugo-belloc/annoying-tower-of-hanoi
[INFO] tweaked toml for git repo https://github.com/hugo-belloc/annoying-tower-of-hanoi written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/hugo-belloc/annoying-tower-of-hanoi already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af54b6062f33b99e418444700f3a823ef0214052" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+af54b6062f33b99e418444700f3a823ef0214052" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f7da5275dfa70f4c43475723e60afc4f262982eb89bc8472c7d1af5f09d59c97
[INFO] running `Command { std: "docker" "start" "-a" "f7da5275dfa70f4c43475723e60afc4f262982eb89bc8472c7d1af5f09d59c97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f7da5275dfa70f4c43475723e60afc4f262982eb89bc8472c7d1af5f09d59c97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7da5275dfa70f4c43475723e60afc4f262982eb89bc8472c7d1af5f09d59c97", kill_on_drop: false }`
[INFO] [stdout] f7da5275dfa70f4c43475723e60afc4f262982eb89bc8472c7d1af5f09d59c97
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+af54b6062f33b99e418444700f3a823ef0214052" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4145cd88963577f4445bdfdbdc7e3af7db1bb60eb84595fee711a966f298827d
[INFO] running `Command { std: "docker" "start" "-a" "4145cd88963577f4445bdfdbdc7e3af7db1bb60eb84595fee711a966f298827d", kill_on_drop: false }`
[INFO] [stderr]     Checking annoying-tower-of-hanoi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `hanoi_discs`
[INFO] [stdout]    --> src/lib.rs:129:23
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub fn write_step(hanoi_discs: &HanoiTowersDiscs, step: usize) {
[INFO] [stdout]     |                       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hanoi_discs`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `step`
[INFO] [stdout]    --> src/lib.rs:129:55
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub fn write_step(hanoi_discs: &HanoiTowersDiscs, step: usize) {
[INFO] [stdout]     |                                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_step`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `src`
[INFO] [stdout]    --> src/lib.rs:133:23
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn write_move(src: HanoiTower, dest: HanoiTower, move_no: usize) {
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_src`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:133:40
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn write_move(src: HanoiTower, dest: HanoiTower, move_no: usize) {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `move_no`
[INFO] [stdout]    --> src/lib.rs:133:58
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn write_move(src: HanoiTower, dest: HanoiTower, move_no: usize) {
[INFO] [stdout]     |                                                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_move_no`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hanoi_discs`
[INFO] [stdout]    --> src/lib.rs:129:23
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub fn write_step(hanoi_discs: &HanoiTowersDiscs, step: usize) {
[INFO] [stdout]     |                       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hanoi_discs`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `step`
[INFO] [stdout]    --> src/lib.rs:129:55
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub fn write_step(hanoi_discs: &HanoiTowersDiscs, step: usize) {
[INFO] [stdout]     |                                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_step`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `src`
[INFO] [stdout]    --> src/lib.rs:133:23
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn write_move(src: HanoiTower, dest: HanoiTower, move_no: usize) {
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_src`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dest`
[INFO] [stdout]    --> src/lib.rs:133:40
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn write_move(src: HanoiTower, dest: HanoiTower, move_no: usize) {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_dest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `move_no`
[INFO] [stdout]    --> src/lib.rs:133:58
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn write_move(src: HanoiTower, dest: HanoiTower, move_no: usize) {
[INFO] [stdout]     |                                                          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_move_no`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:327:13
[INFO] [stdout]     |
[INFO] [stdout] 327 |         let mut htd = HanoiTowersDiscs::build(4);
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `writer` is never read
[INFO] [stdout]    --> src/lib.rs:108:5
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub struct HanoiStepWriter<'a, T: Write> {
[INFO] [stdout]     |            --------------- field in this struct
[INFO] [stdout] 107 |     // buffer: String,
[INFO] [stdout] 108 |     writer: &'a mut T,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constants `HEADER_HEIGHT`, `FOOTER_HEIGHT`, `EXTRA_WIDTH`, `WIDTH_DEPTH_COEFF`, `CHAR_MAX_LENGTH_UTF8`, and `DELIMITER` are never used
[INFO] [stdout]    --> src/lib.rs:112:11
[INFO] [stdout]     |
[INFO] [stdout] 111 | impl<'a, T: Write> HanoiStepWriter<'a, T> {
[INFO] [stdout]     | ----------------------------------------- associated constants in this implementation
[INFO] [stdout] 112 |     const HEADER_HEIGHT: usize = 3;
[INFO] [stdout]     |           ^^^^^^^^^^^^^
[INFO] [stdout] 113 |     const FOOTER_HEIGHT: usize = 3;
[INFO] [stdout]     |           ^^^^^^^^^^^^^
[INFO] [stdout] 114 |     const EXTRA_WIDTH: usize = 12;
[INFO] [stdout]     |           ^^^^^^^^^^^
[INFO] [stdout] 115 |     const WIDTH_DEPTH_COEFF: usize = 6;
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 116 |     const CHAR_MAX_LENGTH_UTF8: usize = 3; //Longest char to draw are box drawing chars
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 117 |     const DELIMITER: &'static str = "\n";
[INFO] [stdout]     |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `writer` is never read
[INFO] [stdout]    --> src/lib.rs:108:5
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub struct HanoiStepWriter<'a, T: Write> {
[INFO] [stdout]     |            --------------- field in this struct
[INFO] [stdout] 107 |     // buffer: String,
[INFO] [stdout] 108 |     writer: &'a mut T,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constants `HEADER_HEIGHT`, `FOOTER_HEIGHT`, `EXTRA_WIDTH`, `WIDTH_DEPTH_COEFF`, `CHAR_MAX_LENGTH_UTF8`, and `DELIMITER` are never used
[INFO] [stdout]    --> src/lib.rs:112:11
[INFO] [stdout]     |
[INFO] [stdout] 111 | impl<'a, T: Write> HanoiStepWriter<'a, T> {
[INFO] [stdout]     | ----------------------------------------- associated constants in this implementation
[INFO] [stdout] 112 |     const HEADER_HEIGHT: usize = 3;
[INFO] [stdout]     |           ^^^^^^^^^^^^^
[INFO] [stdout] 113 |     const FOOTER_HEIGHT: usize = 3;
[INFO] [stdout]     |           ^^^^^^^^^^^^^
[INFO] [stdout] 114 |     const EXTRA_WIDTH: usize = 12;
[INFO] [stdout]     |           ^^^^^^^^^^^
[INFO] [stdout] 115 |     const WIDTH_DEPTH_COEFF: usize = 6;
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 116 |     const CHAR_MAX_LENGTH_UTF8: usize = 3; //Longest char to draw are box drawing chars
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 117 |     const DELIMITER: &'static str = "\n";
[INFO] [stdout]     |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "4145cd88963577f4445bdfdbdc7e3af7db1bb60eb84595fee711a966f298827d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4145cd88963577f4445bdfdbdc7e3af7db1bb60eb84595fee711a966f298827d", kill_on_drop: false }`
[INFO] [stdout] 4145cd88963577f4445bdfdbdc7e3af7db1bb60eb84595fee711a966f298827d