[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 try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAngael%2Frust-async-test" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Angael/rust-async-test on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "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-tc2/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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a9e0d5b9746aed52889461d28e512ad549aca4d288a35445de8e1e7c6d68a45
[INFO] running `Command { std: "docker" "start" "-a" "0a9e0d5b9746aed52889461d28e512ad549aca4d288a35445de8e1e7c6d68a45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a9e0d5b9746aed52889461d28e512ad549aca4d288a35445de8e1e7c6d68a45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a9e0d5b9746aed52889461d28e512ad549aca4d288a35445de8e1e7c6d68a45", kill_on_drop: false }`
[INFO] [stdout] 0a9e0d5b9746aed52889461d28e512ad549aca4d288a35445de8e1e7c6d68a45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3326125b6db84e9d2e81ac56aa4a575b5b704ae6a77834cfec5352eeb4d449e9
[INFO] running `Command { std: "docker" "start" "-a" "3326125b6db84e9d2e81ac56aa4a575b5b704ae6a77834cfec5352eeb4d449e9", 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: 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: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "3326125b6db84e9d2e81ac56aa4a575b5b704ae6a77834cfec5352eeb4d449e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3326125b6db84e9d2e81ac56aa4a575b5b704ae6a77834cfec5352eeb4d449e9", kill_on_drop: false }`
[INFO] [stdout] 3326125b6db84e9d2e81ac56aa4a575b5b704ae6a77834cfec5352eeb4d449e9