[INFO] cloning repository https://github.com/ilmoi/rust_learnings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ilmoi/rust_learnings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Filmoi%2Frust_learnings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Filmoi%2Frust_learnings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ea8b8c491e6cdf2d89b5c53b1da45658249758b1
[INFO] checking ilmoi/rust_learnings against try#3bb2879ea9e58d65b875f9a98df44f4a43ce2597 for pr-85387
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Filmoi%2Frust_learnings" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ilmoi/rust_learnings on toolchain 3bb2879ea9e58d65b875f9a98df44f4a43ce2597
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ilmoi/rust_learnings
[INFO] finished tweaking git repo https://github.com/ilmoi/rust_learnings
[INFO] tweaked toml for git repo https://github.com/ilmoi/rust_learnings written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/ilmoi/rust_learnings already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 93155ff4cfa98ad968fb967c776d3b9e7ba148c8cc55e1d651c357dab87d0e71
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "93155ff4cfa98ad968fb967c776d3b9e7ba148c8cc55e1d651c357dab87d0e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "93155ff4cfa98ad968fb967c776d3b9e7ba148c8cc55e1d651c357dab87d0e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93155ff4cfa98ad968fb967c776d3b9e7ba148c8cc55e1d651c357dab87d0e71", kill_on_drop: false }`
[INFO] [stdout] 93155ff4cfa98ad968fb967c776d3b9e7ba148c8cc55e1d651c357dab87d0e71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4fd12e0c6513ca44891199bc3d7552c12bcbe08a261fb2127cac8c9d3c1de5b4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4fd12e0c6513ca44891199bc3d7552c12bcbe08a261fb2127cac8c9d3c1de5b4", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]     Checking pin-project-lite v0.2.6
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[INFO] [stderr]    Compiling const_fn v0.4.8
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[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking adler v1.0.2
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[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]    Compiling futures-macro v0.3.15
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[INFO] [stderr]     Checking instant v0.1.9
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[INFO] [stderr]     Checking form_urlencoded v1.0.1
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[INFO] [stderr]     Checking _learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `AsyncReadExt`
[INFO] [stdout]  --> src/play_tokio/play_tokio.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader, AsyncBufReadExt};
[INFO] [stdout]   |                 ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `AsyncReadExt`
[INFO] [stdout]  --> src/play_tokio/play_tokio.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader, AsyncBufReadExt};
[INFO] [stdout]   |                 ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.82s
[INFO] running `Command { std: "docker" "inspect" "4fd12e0c6513ca44891199bc3d7552c12bcbe08a261fb2127cac8c9d3c1de5b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fd12e0c6513ca44891199bc3d7552c12bcbe08a261fb2127cac8c9d3c1de5b4", kill_on_drop: false }`
[INFO] [stdout] 4fd12e0c6513ca44891199bc3d7552c12bcbe08a261fb2127cac8c9d3c1de5b4