[INFO] cloning repository https://github.com/sho-19202325/rust_lesson
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sho-19202325/rust_lesson" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsho-19202325%2Frust_lesson", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsho-19202325%2Frust_lesson'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 69808f3a3e446fb49c32b05eafd9d9d005408e49
[INFO] building sho-19202325/rust_lesson 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%2Fsho-19202325%2Frust_lesson" "/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/sho-19202325/rust_lesson 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/sho-19202325/rust_lesson
[INFO] finished tweaking git repo https://github.com/sho-19202325/rust_lesson
[INFO] tweaked toml for git repo https://github.com/sho-19202325/rust_lesson written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sho-19202325/rust_lesson 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] [stderr]     Updating git repository `https://github.com/sho-19202325/lib-demo`
[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-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 0467298d22030cca967cff75648b4415b7a3ad34d559275f759edf73b4f59745
[INFO] running `Command { std: "docker" "start" "-a" "0467298d22030cca967cff75648b4415b7a3ad34d559275f759edf73b4f59745", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0467298d22030cca967cff75648b4415b7a3ad34d559275f759edf73b4f59745", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0467298d22030cca967cff75648b4415b7a3ad34d559275f759edf73b4f59745", kill_on_drop: false }`
[INFO] [stdout] 0467298d22030cca967cff75648b4415b7a3ad34d559275f759edf73b4f59745
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] a6c63fb2459502100d957b2085240554e476f8789dca13560bcf670013dead63
[INFO] running `Command { std: "docker" "start" "-a" "a6c63fb2459502100d957b2085240554e476f8789dca13560bcf670013dead63", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling getrandom v0.2.10
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling lib_demo v0.1.0 (https://github.com/sho-19202325/lib-demo#ae61737b)
[INFO] [stderr]    Compiling rust-lesson v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]  --> src/debug.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 |   let mut x = 1;
[INFO] [stdout]   |           ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_x` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]  --> src/debug.rs:3:3
[INFO] [stdout]   |
[INFO] [stdout] 3 |   x = 2;
[INFO] [stdout]   |   ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]  --> src/debug.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 4 |   x = 3;
[INFO] [stdout]   |   ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]  --> src/debug.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut y = 1;
[INFO] [stdout]   |             ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_y` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]  --> src/debug.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     y = 2;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]  --> src/debug.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     y = 3;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/debug.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   x = 4;
[INFO] [stdout]    |   ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/debug.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 12 |   x = 5;
[INFO] [stdout]    |   ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/unit_test.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `compare_area` is never used
[INFO] [stdout]  --> src/unit_test.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Rectangle {
[INFO] [stdout]   | -------------- method in this implementation
[INFO] [stdout] 7 |     fn compare_area(&self, other: &Rectangle) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_value` is never used
[INFO] [stdout]   --> src/unit_test.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn double_value(a: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greeting` is never used
[INFO] [stdout]   --> src/unit_test.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn greeting(name: &str) -> String {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.01s
[INFO] running `Command { std: "docker" "inspect" "a6c63fb2459502100d957b2085240554e476f8789dca13560bcf670013dead63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6c63fb2459502100d957b2085240554e476f8789dca13560bcf670013dead63", kill_on_drop: false }`
[INFO] [stdout] a6c63fb2459502100d957b2085240554e476f8789dca13560bcf670013dead63
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] eb0c29fce2d0904d56fdf2585dd3e42bf24e45628c4c1d6d9648099095662eb3
[INFO] running `Command { std: "docker" "start" "-a" "eb0c29fce2d0904d56fdf2585dd3e42bf24e45628c4c1d6d9648099095662eb3", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-lesson v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]  --> src/debug.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 |   let mut x = 1;
[INFO] [stdout]   |           ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_x` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]  --> src/debug.rs:3:3
[INFO] [stdout]   |
[INFO] [stdout] 3 |   x = 2;
[INFO] [stdout]   |   ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]  --> src/debug.rs:4:3
[INFO] [stdout]   |
[INFO] [stdout] 4 |   x = 3;
[INFO] [stdout]   |   ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]  --> src/debug.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut y = 1;
[INFO] [stdout]   |             ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_y` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]  --> src/debug.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     y = 2;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]  --> src/debug.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     y = 3;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/debug.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   x = 4;
[INFO] [stdout]    |   ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/debug.rs:12:3
[INFO] [stdout]    |
[INFO] [stdout] 12 |   x = 5;
[INFO] [stdout]    |   ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "eb0c29fce2d0904d56fdf2585dd3e42bf24e45628c4c1d6d9648099095662eb3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb0c29fce2d0904d56fdf2585dd3e42bf24e45628c4c1d6d9648099095662eb3", kill_on_drop: false }`
[INFO] [stdout] eb0c29fce2d0904d56fdf2585dd3e42bf24e45628c4c1d6d9648099095662eb3