[INFO] cloning repository https://github.com/leedohyung28/Rust-Study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/leedohyung28/Rust-Study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleedohyung28%2FRust-Study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleedohyung28%2FRust-Study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 38a9073e9d3654f62b969f11e95cdf0a931ca147
[INFO] checking leedohyung28/Rust-Study against master#8424f8e8cdf07010967a57584fd647b30e930d4d for pr-120095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleedohyung28%2FRust-Study" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/leedohyung28/Rust-Study on toolchain 8424f8e8cdf07010967a57584fd647b30e930d4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8424f8e8cdf07010967a57584fd647b30e930d4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/leedohyung28/Rust-Study
[INFO] finished tweaking git repo https://github.com/leedohyung28/Rust-Study
[INFO] tweaked toml for git repo https://github.com/leedohyung28/Rust-Study written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/leedohyung28/Rust-Study 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" "+8424f8e8cdf07010967a57584fd647b30e930d4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking leedohyung28/Rust-Study against try#047472f299946caf090d1b5608ae4bd9f0416256+rustflags=-Ddereferencing_mut_binding for pr-120095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleedohyung28%2FRust-Study" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/leedohyung28/Rust-Study on toolchain 047472f299946caf090d1b5608ae4bd9f0416256
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/leedohyung28/Rust-Study
[INFO] finished tweaking git repo https://github.com/leedohyung28/Rust-Study
[INFO] tweaked toml for git repo https://github.com/leedohyung28/Rust-Study written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/leedohyung28/Rust-Study 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" "+047472f299946caf090d1b5608ae4bd9f0416256" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f64441c1b488e3a7116012218edf207d4fc4639109cc15fa1711dacb1c7b26e7
[INFO] running `Command { std: "docker" "start" "-a" "f64441c1b488e3a7116012218edf207d4fc4639109cc15fa1711dacb1c7b26e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f64441c1b488e3a7116012218edf207d4fc4639109cc15fa1711dacb1c7b26e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f64441c1b488e3a7116012218edf207d4fc4639109cc15fa1711dacb1c7b26e7", kill_on_drop: false }`
[INFO] [stdout] f64441c1b488e3a7116012218edf207d4fc4639109cc15fa1711dacb1c7b26e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Ddereferencing_mut_binding" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fcdd4c164c4a20efe5c989002d3603cec8ac2c531fa64ca1c9c82b122efb4376
[INFO] running `Command { std: "docker" "start" "-a" "fcdd4c164c4a20efe5c989002d3603cec8ac2c531fa64ca1c9c82b122efb4376", kill_on_drop: false }`
[INFO] [stderr]     Checking test_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `number_64`
[INFO] [stdout]   --> src/main.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let number_64 = 4.0;    // compiler가 자동적으로 f64로 인식
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_number_64`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number_64`
[INFO] [stdout]   --> src/main.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let number_64 = 4.0;    // compiler가 자동적으로 f64로 인식
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_number_64`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number_32`
[INFO] [stdout]   --> src/main.rs:96:9
[INFO] [stdout]    |
[INFO] [stdout] 96 |     let number_32: f32 = 5.0;    // f32가 되도록 명시적 선언
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_number_32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number_32`
[INFO] [stdout]   --> src/main.rs:96:9
[INFO] [stdout]    |
[INFO] [stdout] 96 |     let number_32: f32 = 5.0;    // f32가 되도록 명시적 선언
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_number_32`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `step1_1` is never used
[INFO] [stdout]  --> src/main.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn step1_1() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `step1_1` is never used
[INFO] [stdout]  --> src/main.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn step1_1() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `println_test` is never used
[INFO] [stdout]   --> src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn println_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `println_test` is never used
[INFO] [stdout]   --> src/main.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn println_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `todo_test` is never used
[INFO] [stdout]   --> src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn todo_test() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_test` is never used
[INFO] [stdout]   --> src/main.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn print_test() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `todo_test` is never used
[INFO] [stdout]   --> src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn todo_test() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_test` is never used
[INFO] [stdout]   --> src/main.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn print_test() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `brackets_test` is never used
[INFO] [stdout]   --> src/main.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn brackets_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `brackets_test` is never used
[INFO] [stdout]   --> src/main.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn brackets_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `step1_2` is never used
[INFO] [stdout]   --> src/main.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn step1_2() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `step1_2` is never used
[INFO] [stdout]   --> src/main.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn step1_2() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `let_test` is never used
[INFO] [stdout]   --> src/main.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn let_test() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `let_test` is never used
[INFO] [stdout]   --> src/main.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn let_test() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mut_test` is never used
[INFO] [stdout]   --> src/main.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn mut_test() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mut_test` is never used
[INFO] [stdout]   --> src/main.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn mut_test() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_shadowing_test` is never used
[INFO] [stdout]   --> src/main.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn variable_shadowing_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_shadowing_test` is never used
[INFO] [stdout]   --> src/main.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn variable_shadowing_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `step1_3` is never used
[INFO] [stdout]   --> src/main.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn step1_3() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `step1_3` is never used
[INFO] [stdout]   --> src/main.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn step1_3() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `num_type_test` is never used
[INFO] [stdout]   --> src/main.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn num_type_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `num_type_test` is never used
[INFO] [stdout]   --> src/main.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn num_type_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `float_type_test` is never used
[INFO] [stdout]   --> src/main.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn float_type_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `float_type_test` is never used
[INFO] [stdout]   --> src/main.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn float_type_test() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bool_test` is never used
[INFO] [stdout]    --> src/main.rs:102:4
[INFO] [stdout]     |
[INFO] [stdout] 102 | fn bool_test() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `char_test` is never used
[INFO] [stdout]    --> src/main.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn char_test() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bool_test` is never used
[INFO] [stdout]    --> src/main.rs:102:4
[INFO] [stdout]     |
[INFO] [stdout] 102 | fn bool_test() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_test` is never used
[INFO] [stdout]    --> src/main.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn tuple_test() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `char_test` is never used
[INFO] [stdout]    --> src/main.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn char_test() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `struct_test` is never used
[INFO] [stdout]    --> src/main.rs:151:4
[INFO] [stdout]     |
[INFO] [stdout] 151 | fn struct_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_test` is never used
[INFO] [stdout]    --> src/main.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn tuple_test() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `struct_test` is never used
[INFO] [stdout]    --> src/main.rs:151:4
[INFO] [stdout]     |
[INFO] [stdout] 151 | fn struct_test() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] running `Command { std: "docker" "inspect" "fcdd4c164c4a20efe5c989002d3603cec8ac2c531fa64ca1c9c82b122efb4376", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fcdd4c164c4a20efe5c989002d3603cec8ac2c531fa64ca1c9c82b122efb4376", kill_on_drop: false }`
[INFO] [stdout] fcdd4c164c4a20efe5c989002d3603cec8ac2c531fa64ca1c9c82b122efb4376