[INFO] cloning repository https://github.com/rikodao/rustybox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rikodao/rustybox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frikodao%2Frustybox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frikodao%2Frustybox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1f7e61f44a5a8d8d57f0b32787a1b6dddcfd111d
[INFO] building rikodao/rustybox 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%2Frikodao%2Frustybox" "/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/rikodao/rustybox 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/rikodao/rustybox
[INFO] finished tweaking git repo https://github.com/rikodao/rustybox
[INFO] tweaked toml for git repo https://github.com/rikodao/rustybox written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rikodao/rustybox 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] 03d1675454ababa849477ddda3463b1942b0643b4a304d764258a954db0325a1
[INFO] running `Command { std: "docker" "start" "-a" "03d1675454ababa849477ddda3463b1942b0643b4a304d764258a954db0325a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "03d1675454ababa849477ddda3463b1942b0643b4a304d764258a954db0325a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03d1675454ababa849477ddda3463b1942b0643b4a304d764258a954db0325a1", kill_on_drop: false }`
[INFO] [stdout] 03d1675454ababa849477ddda3463b1942b0643b4a304d764258a954db0325a1
[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] f683ff0b1a6a711b543cb09f47cf1e40997dc45f18cc264ba13907b34c8cbde2
[INFO] running `Command { std: "docker" "start" "-a" "f683ff0b1a6a711b543cb09f47cf1e40997dc45f18cc264ba13907b34c8cbde2", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling rustybox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/bin/ls.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `all` is never used
[INFO] [stdout]   --> src/bin/ls.rs:22:19
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl LsOption {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub(crate) fn all(mut self, all: bool) -> Self {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_from_cli` is never used
[INFO] [stdout]   --> src/bin/ls.rs:44:19
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl Ls {
[INFO] [stdout]    | ------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 44 |     pub(crate) fn new_from_cli(args: &mut Args) -> Self {
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `all` is never used
[INFO] [stdout]   --> src/bin/cat.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl CatOption {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub(crate) fn all(mut self, all: bool) -> Self {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/cat.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct Cat {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 33 |     path: PathBuf,
[INFO] [stdout] 34 |     option: CatOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/cat.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |         f.read_to_string(&mut content);
[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] 67 |         let _ = f.read_to_string(&mut content);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/bin/ls.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.56s
[INFO] running `Command { std: "docker" "inspect" "f683ff0b1a6a711b543cb09f47cf1e40997dc45f18cc264ba13907b34c8cbde2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f683ff0b1a6a711b543cb09f47cf1e40997dc45f18cc264ba13907b34c8cbde2", kill_on_drop: false }`
[INFO] [stdout] f683ff0b1a6a711b543cb09f47cf1e40997dc45f18cc264ba13907b34c8cbde2
[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] a83faf9d536970f2a234b313f3f2484fa6e2fac7056defc5deb5857452791143
[INFO] running `Command { std: "docker" "start" "-a" "a83faf9d536970f2a234b313f3f2484fa6e2fac7056defc5deb5857452791143", kill_on_drop: false }`
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/bin/ls.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `all` is never used
[INFO] [stdout]   --> src/bin/ls.rs:22:19
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl LsOption {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub(crate) fn all(mut self, all: bool) -> Self {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_from_cli` is never used
[INFO] [stdout]   --> src/bin/ls.rs:44:19
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl Ls {
[INFO] [stdout]    | ------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 44 |     pub(crate) fn new_from_cli(args: &mut Args) -> Self {
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rustybox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `all` is never used
[INFO] [stdout]   --> src/bin/cat.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl CatOption {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub(crate) fn all(mut self, all: bool) -> Self {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/cat.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct Cat {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 33 |     path: PathBuf,
[INFO] [stdout] 34 |     option: CatOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `option` is never read
[INFO] [stdout]   --> src/bin/ls.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct Ls {
[INFO] [stdout]    |            -- field in this struct
[INFO] [stdout] 32 |     path: PathBuf,
[INFO] [stdout] 33 |     option: LsOption,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/cat.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |         f.read_to_string(&mut content);
[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] 67 |         let _ = f.read_to_string(&mut content);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "a83faf9d536970f2a234b313f3f2484fa6e2fac7056defc5deb5857452791143", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a83faf9d536970f2a234b313f3f2484fa6e2fac7056defc5deb5857452791143", kill_on_drop: false }`
[INFO] [stdout] a83faf9d536970f2a234b313f3f2484fa6e2fac7056defc5deb5857452791143