[INFO] cloning repository https://github.com/lbt05/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lbt05/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbt05%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbt05%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a08295079cdc40ec489157aa8c87c5ef30765b43
[INFO] building lbt05/rust-playground against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbt05%2Frust-playground" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lbt05/rust-playground on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lbt05/rust-playground
[INFO] finished tweaking git repo https://github.com/lbt05/rust-playground
[INFO] tweaked toml for git repo https://github.com/lbt05/rust-playground written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/lbt05/rust-playground 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6a2840420a0e52d86260f26584c4f9d136888f1b24271aeb20b27d3ad4aeb05b
[INFO] running `Command { std: "docker" "start" "-a" "6a2840420a0e52d86260f26584c4f9d136888f1b24271aeb20b27d3ad4aeb05b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a2840420a0e52d86260f26584c4f9d136888f1b24271aeb20b27d3ad4aeb05b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a2840420a0e52d86260f26584c4f9d136888f1b24271aeb20b27d3ad4aeb05b", kill_on_drop: false }`
[INFO] [stdout] 6a2840420a0e52d86260f26584c4f9d136888f1b24271aeb20b27d3ad4aeb05b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5213d05d37b010dbb895f9fdb1af79405f1ab97e91c05f713d8e01f68e1bc172
[INFO] running `Command { std: "docker" "start" "-a" "5213d05d37b010dbb895f9fdb1af79405f1ab97e91c05f713d8e01f68e1bc172", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling adler32 v1.0.4
[INFO] [stderr]    Compiling podio v0.1.6
[INFO] [stderr]    Compiling miniz_oxide v0.3.6
[INFO] [stderr]    Compiling bzip2-sys v0.1.7
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling flate2 v1.0.13
[INFO] [stderr]    Compiling bzip2 v0.3.3
[INFO] [stderr]    Compiling zip v0.5.4
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `multi_thread_with_channel`, `simple_thread`, `thread_await_example`, `thread_with_arc_share`, `thread_with_arc`, `thread_with_channel`, and `thread_with_move`
[INFO] [stdout]  --> src/main.rs:3:44
[INFO] [stdout]   |
[INFO] [stdout] 3 | ...::{multi_thread_with_channel, simple_thread, thread_await_example, thread_with_arc, thread_with_arc_share, thread_with_channel, thread_with_mov...
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/file/zip_file.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut file = File::open(file_path).unwrap();
[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: function `simple_thread` is never used
[INFO] [stdout]  --> src/concurrency/play_concurrency.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn simple_thread() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_await_example` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn thread_await_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_move` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn thread_with_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_channel` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multi_thread_with_channel` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn multi_thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_arc` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn thread_with_arc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_arc_share` is never used
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn thread_with_arc_share() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculation_method` is never used
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn calculation_method(key: i32, data: Arc<RwLock<HashMap<i32, i32, RandomState>>>, thread_tx: Sender<i32>) -> () {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file/zip_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         file.read_to_string(&mut buffer);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let _ = file.read_to_string(&mut buffer);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.79s
[INFO] running `Command { std: "docker" "inspect" "5213d05d37b010dbb895f9fdb1af79405f1ab97e91c05f713d8e01f68e1bc172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5213d05d37b010dbb895f9fdb1af79405f1ab97e91c05f713d8e01f68e1bc172", kill_on_drop: false }`
[INFO] [stdout] 5213d05d37b010dbb895f9fdb1af79405f1ab97e91c05f713d8e01f68e1bc172
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ed039ecdf78430a8355c68cc7825bfc69b24cdf5cb8f63c78c1afcd54c7f4a7
[INFO] running `Command { std: "docker" "start" "-a" "1ed039ecdf78430a8355c68cc7825bfc69b24cdf5cb8f63c78c1afcd54c7f4a7", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `multi_thread_with_channel`, `simple_thread`, `thread_await_example`, `thread_with_arc_share`, `thread_with_arc`, `thread_with_channel`, and `thread_with_move`
[INFO] [stdout]  --> src/main.rs:3:44
[INFO] [stdout]   |
[INFO] [stdout] 3 | ...::{multi_thread_with_channel, simple_thread, thread_await_example, thread_with_arc, thread_with_arc_share, thread_with_channel, thread_with_mov...
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/file/zip_file.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut file = File::open(file_path).unwrap();
[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: function `simple_thread` is never used
[INFO] [stdout]  --> src/concurrency/play_concurrency.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn simple_thread() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_await_example` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn thread_await_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_move` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn thread_with_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_channel` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multi_thread_with_channel` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn multi_thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_arc` is never used
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn thread_with_arc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_with_arc_share` is never used
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn thread_with_arc_share() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculation_method` is never used
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn calculation_method(key: i32, data: Arc<RwLock<HashMap<i32, i32, RandomState>>>, thread_tx: Sender<i32>) -> () {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file/zip_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         file.read_to_string(&mut buffer);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let _ = file.read_to_string(&mut buffer);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "1ed039ecdf78430a8355c68cc7825bfc69b24cdf5cb8f63c78c1afcd54c7f4a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ed039ecdf78430a8355c68cc7825bfc69b24cdf5cb8f63c78c1afcd54c7f4a7", kill_on_drop: false }`
[INFO] [stdout] 1ed039ecdf78430a8355c68cc7825bfc69b24cdf5cb8f63c78c1afcd54c7f4a7