[INFO] cloning repository https://github.com/Angael/rust-async-test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Angael/rust-async-test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAngael%2Frust-async-test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAngael%2Frust-async-test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 675727cd9c3c78d0c7d8c02c819f0f888f44d9e0
[INFO] checking Angael/rust-async-test/675727cd9c3c78d0c7d8c02c819f0f888f44d9e0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAngael%2Frust-async-test" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Angael/rust-async-test on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Angael/rust-async-test
[INFO] finished tweaking git repo https://github.com/Angael/rust-async-test
[INFO] tweaked toml for git repo https://github.com/Angael/rust-async-test written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Angael/rust-async-test 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 43c04c69e8d33540004679784311d1c43be516806c807e22e96b839ea42227f3
[INFO] running `Command { std: "docker" "start" "-a" "43c04c69e8d33540004679784311d1c43be516806c807e22e96b839ea42227f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43c04c69e8d33540004679784311d1c43be516806c807e22e96b839ea42227f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43c04c69e8d33540004679784311d1c43be516806c807e22e96b839ea42227f3", kill_on_drop: false }`
[INFO] [stdout] 43c04c69e8d33540004679784311d1c43be516806c807e22e96b839ea42227f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 650ac59be9e513e3fa9f4ea3d6165c2dc77bdf5734374453c0c846021f06368f
[INFO] running `Command { std: "docker" "start" "-a" "650ac59be9e513e3fa9f4ea3d6165c2dc77bdf5734374453c0c846021f06368f", kill_on_drop: false }`
[INFO] [stderr]     Checking async-test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]  --> src/examples/custom_structs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Color {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `to_hex`, and `contrast` are never used
[INFO] [stdout]   --> src/examples/custom_structs.rs:9:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl Color {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 9  |     fn new(red: u8, green: u8, blue: u8) -> Color {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     fn to_hex(&self) -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn contrast(&self, other: &Color) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/examples/smart_pointers.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 |     Cons(Box<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 2 |     Cons(()),
[INFO] [stdout]   |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]  --> src/examples/custom_structs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Color {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `to_hex`, and `contrast` are never used
[INFO] [stdout]   --> src/examples/custom_structs.rs:9:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl Color {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 9  |     fn new(red: u8, green: u8, blue: u8) -> Color {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     fn to_hex(&self) -> String {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn contrast(&self, other: &Color) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/examples/smart_pointers.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 |     Cons(Box<List>),
[INFO] [stdout]   |     ---- ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 2 |     Cons(()),
[INFO] [stdout]   |          ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "650ac59be9e513e3fa9f4ea3d6165c2dc77bdf5734374453c0c846021f06368f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "650ac59be9e513e3fa9f4ea3d6165c2dc77bdf5734374453c0c846021f06368f", kill_on_drop: false }`
[INFO] [stdout] 650ac59be9e513e3fa9f4ea3d6165c2dc77bdf5734374453c0c846021f06368f