[INFO] cloning repository https://github.com/parduhn/rs-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/parduhn/rs-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fparduhn%2Frs-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fparduhn%2Frs-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 74f845f888c0fc49d8eef967f0cd0f36a4d3a0bf
[INFO] checking parduhn/rs-playground against master#90384941aae4ea38de00e4702b50757e9b882a19 for pr-138340
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fparduhn%2Frs-playground" "/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/parduhn/rs-playground on toolchain 90384941aae4ea38de00e4702b50757e9b882a19
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+90384941aae4ea38de00e4702b50757e9b882a19" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/parduhn/rs-playground
[INFO] finished tweaking git repo https://github.com/parduhn/rs-playground
[INFO] tweaked toml for git repo https://github.com/parduhn/rs-playground written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/parduhn/rs-playground 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" "+90384941aae4ea38de00e4702b50757e9b882a19" "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-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+90384941aae4ea38de00e4702b50757e9b882a19" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 33db75e923c717329e55671414fef142c293d1ef33bec522d96ce387df007a16
[INFO] running `Command { std: "docker" "start" "-a" "33db75e923c717329e55671414fef142c293d1ef33bec522d96ce387df007a16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33db75e923c717329e55671414fef142c293d1ef33bec522d96ce387df007a16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33db75e923c717329e55671414fef142c293d1ef33bec522d96ce387df007a16", kill_on_drop: false }`
[INFO] [stdout] 33db75e923c717329e55671414fef142c293d1ef33bec522d96ce387df007a16
[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" "-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+90384941aae4ea38de00e4702b50757e9b882a19" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 31d1ecc326f267c46245ba0d2d5f2458a51fd909f6437c906a6f141a7a6b4885
[INFO] running `Command { std: "docker" "start" "-a" "31d1ecc326f267c46245ba0d2d5f2458a51fd909f6437c906a6f141a7a6b4885", kill_on_drop: false }`
[INFO] [stderr]     Checking playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `standard_article`
[INFO] [stdout]   --> src/traits.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let standard_article = StandardArticle {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_standard_article`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/traits.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 41 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 53 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 54 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `author` and `content` are never read
[INFO] [stdout]   --> src/traits.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub struct StandardArticle {
[INFO] [stdout]    |            --------------- fields in this struct
[INFO] [stdout] 64 |     pub author: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 65 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `standard_article`
[INFO] [stdout]   --> src/traits.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let standard_article = StandardArticle {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_standard_article`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/traits.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 41 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 53 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 54 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `author` and `content` are never read
[INFO] [stdout]   --> src/traits.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub struct StandardArticle {
[INFO] [stdout]    |            --------------- fields in this struct
[INFO] [stdout] 64 |     pub author: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 65 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "31d1ecc326f267c46245ba0d2d5f2458a51fd909f6437c906a6f141a7a6b4885", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31d1ecc326f267c46245ba0d2d5f2458a51fd909f6437c906a6f141a7a6b4885", kill_on_drop: false }`
[INFO] [stdout] 31d1ecc326f267c46245ba0d2d5f2458a51fd909f6437c906a6f141a7a6b4885