[INFO] cloning repository https://github.com/lowr/my-gzip
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lowr/my-gzip" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flowr%2Fmy-gzip", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flowr%2Fmy-gzip'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 50c6be38f5c69df1e5d5d53b7f0c9b3b93dd5f8e
[INFO] testing lowr/my-gzip against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flowr%2Fmy-gzip" "/workspace/builds/worker-75/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-75/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lowr/my-gzip on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lowr/my-gzip
[INFO] finished tweaking git repo https://github.com/lowr/my-gzip
[INFO] tweaked toml for git repo https://github.com/lowr/my-gzip written to /workspace/builds/worker-75/source/Cargo.toml
[INFO] crate git repo https://github.com/lowr/my-gzip already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] afabc8404b541454dd3af9474747ab10ca368e1a97a329b94ec110cce31c7c19
[INFO] running `Command { std: "docker" "start" "-a" "afabc8404b541454dd3af9474747ab10ca368e1a97a329b94ec110cce31c7c19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "afabc8404b541454dd3af9474747ab10ca368e1a97a329b94ec110cce31c7c19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afabc8404b541454dd3af9474747ab10ca368e1a97a329b94ec110cce31c7c19", kill_on_drop: false }`
[INFO] [stdout] afabc8404b541454dd3af9474747ab10ca368e1a97a329b94ec110cce31c7c19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88332564aa59e797821acd6d0723236c647ef29ceeab97a39d6c39b1677ac7aa
[INFO] running `Command { std: "docker" "start" "-a" "88332564aa59e797821acd6d0723236c647ef29ceeab97a39d6c39b1677ac7aa", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling encoding_rs v0.8.28
[INFO] [stderr]    Compiling anyhow v1.0.42
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling os_str_bytes v2.4.0
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling textwrap v0.12.1
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.2
[INFO] [stderr]    Compiling clap v3.0.0-beta.2
[INFO] [stderr]    Compiling my-gzip v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/tree.rs:98:19
[INFO] [stdout]    |
[INFO] [stdout] 98 |     pub(crate) fn size(&self) -> usize {
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]    --> src/tree.rs:169:19
[INFO] [stdout]     |
[INFO] [stdout] 169 |     pub(crate) fn size(&self) -> usize {
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stdout]    --> src/decompress/huffman.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 prev.insert(b);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you intended to set a value, consider assignment instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stdout]    --> src/decompress/huffman.rs:146:17
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 prev.insert(0);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you intended to set a value, consider assignment instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.64s
[INFO] running `Command { std: "docker" "inspect" "88332564aa59e797821acd6d0723236c647ef29ceeab97a39d6c39b1677ac7aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88332564aa59e797821acd6d0723236c647ef29ceeab97a39d6c39b1677ac7aa", kill_on_drop: false }`
[INFO] [stdout] 88332564aa59e797821acd6d0723236c647ef29ceeab97a39d6c39b1677ac7aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6eca3b38be65505931518e7a24e548b8c1b7330e3ea770ae84118c35bb8948aa
[INFO] running `Command { std: "docker" "start" "-a" "6eca3b38be65505931518e7a24e548b8c1b7330e3ea770ae84118c35bb8948aa", kill_on_drop: false }`
[INFO] [stderr]    Compiling my-gzip v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/tree.rs:98:19
[INFO] [stdout]    |
[INFO] [stdout] 98 |     pub(crate) fn size(&self) -> usize {
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]    --> src/tree.rs:169:19
[INFO] [stdout]     |
[INFO] [stdout] 169 |     pub(crate) fn size(&self) -> usize {
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stdout]    --> src/decompress/huffman.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 prev.insert(b);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you intended to set a value, consider assignment instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stdout]    --> src/decompress/huffman.rs:146:17
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 prev.insert(0);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you intended to set a value, consider assignment instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/tree.rs:98:19
[INFO] [stdout]    |
[INFO] [stdout] 98 |     pub(crate) fn size(&self) -> usize {
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]    --> src/tree.rs:169:19
[INFO] [stdout]     |
[INFO] [stdout] 169 |     pub(crate) fn size(&self) -> usize {
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stdout]    --> src/decompress/huffman.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 prev.insert(b);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you intended to set a value, consider assignment instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stdout]    --> src/decompress/huffman.rs:146:17
[INFO] [stdout]     |
[INFO] [stdout] 146 |                 prev.insert(0);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you intended to set a value, consider assignment instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.58s
[INFO] running `Command { std: "docker" "inspect" "6eca3b38be65505931518e7a24e548b8c1b7330e3ea770ae84118c35bb8948aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6eca3b38be65505931518e7a24e548b8c1b7330e3ea770ae84118c35bb8948aa", kill_on_drop: false }`
[INFO] [stdout] 6eca3b38be65505931518e7a24e548b8c1b7330e3ea770ae84118c35bb8948aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] de3eeb872e351e7265d2ca671ba26ac4b4cb42297f305d28741443a7f4563582
[INFO] running `Command { std: "docker" "start" "-a" "de3eeb872e351e7265d2ca671ba26ac4b4cb42297f305d28741443a7f4563582", kill_on_drop: false }`
[INFO] [stderr] warning: associated function is never used: `size`
[INFO] [stderr]   --> src/tree.rs:98:19
[INFO] [stderr]    |
[INFO] [stderr] 98 |     pub(crate) fn size(&self) -> usize {
[INFO] [stderr]    |                   ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `size`
[INFO] [stderr]    --> src/tree.rs:169:19
[INFO] [stderr]     |
[INFO] [stderr] 169 |     pub(crate) fn size(&self) -> usize {
[INFO] [stderr]     |                   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stderr]    --> src/decompress/huffman.rs:109:17
[INFO] [stderr]     |
[INFO] [stderr] 109 |                 prev.insert(b);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: if you intended to set a value, consider assignment instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `Option::<T>::insert` that must be used
[INFO] [stderr]    --> src/decompress/huffman.rs:146:17
[INFO] [stderr]     |
[INFO] [stderr] 146 |                 prev.insert(0);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you intended to set a value, consider assignment instead
[INFO] [stderr] 
[INFO] [stderr] warning: `my-gzip` (lib) generated 4 warnings
[INFO] [stderr] warning: `my-gzip` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/my_gzip-fb1e329cc92a0a80)
[INFO] [stdout] 
[INFO] [stdout] running 17 tests
[INFO] [stdout] test ring_buffer::tests::copy_within_works_when_buffer_is_not_fully_filled ... ok
[INFO] [stdout] test ring_buffer::tests::copy_within_works_when_distance_equals_to_capacity ... ok
[INFO] [stdout] test ring_buffer::tests::copy_from_returns_error_when_reader_cannot_read_length_bytes ... ok
[INFO] [stdout] test ring_buffer::tests::copy_within_works_when_src_and_dest_do_not_overlap ... ok
[INFO] [stdout] test ring_buffer::tests::copy_from_works_when_buffer_is_not_fully_filled ... ok
[INFO] [stdout] test ring_buffer::tests::copy_within_works_when_src_and_dest_overlap ... ok
[INFO] [stdout] test ring_buffer::tests::copy_from_works_when_wrapped ... ok
[INFO] [stdout] test ring_buffer::tests::push_overwrites_when_wrapped ... ok
[INFO] [stdout] test ring_buffer::tests::exact_capacity ... ok
[INFO] [stdout] test ring_buffer::tests::push_does_not_expand_capacity ... ok
[INFO] [stdout] test tree::tests::cursor_succeeds_for_existent_key ... ok
[INFO] [stdout] test tree::tests::node_that_already_exists_cannot_be_added ... ok
[INFO] [stdout] test tree::tests::child_node_of_a_leaf_node_cannot_be_added ... ok
[INFO] [stdout] test tree::tests::different_keys_can_be_added ... ok
[INFO] [stdout] test tree::tests::descendant_node_of_a_leaf_node_cannot_be_added ... ok
[INFO] [stdout] test tree::tests::same_key_cannot_be_added ... ok
[INFO] [stdout] test tree::tests::cursor_fails_for_non_existent_key ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.09s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/my_gzip-8e003f3bd279e3ee)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests my-gzip
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "de3eeb872e351e7265d2ca671ba26ac4b4cb42297f305d28741443a7f4563582", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de3eeb872e351e7265d2ca671ba26ac4b4cb42297f305d28741443a7f4563582", kill_on_drop: false }`
[INFO] [stdout] de3eeb872e351e7265d2ca671ba26ac4b4cb42297f305d28741443a7f4563582