[INFO] cloning repository https://github.com/dctk/chatserver_rust_sample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dctk/chatserver_rust_sample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdctk%2Fchatserver_rust_sample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdctk%2Fchatserver_rust_sample'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 882e907a97202e88ef876cd38e7d9ac0389bcdae
[INFO] checking dctk/chatserver_rust_sample against try#353a0a223066e9f46a1d935f2271a26c3c5002bb for pr-75180
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdctk%2Fchatserver_rust_sample" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dctk/chatserver_rust_sample on toolchain 353a0a223066e9f46a1d935f2271a26c3c5002bb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dctk/chatserver_rust_sample
[INFO] finished tweaking git repo https://github.com/dctk/chatserver_rust_sample
[INFO] tweaked toml for git repo https://github.com/dctk/chatserver_rust_sample written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/dctk/chatserver_rust_sample already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fdf0f556b6b1345baa978985f50364d21c140e47eb16d09592b56e96357b0546
[INFO] running `Command { std: "docker" "start" "-a" "fdf0f556b6b1345baa978985f50364d21c140e47eb16d09592b56e96357b0546", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdf0f556b6b1345baa978985f50364d21c140e47eb16d09592b56e96357b0546", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdf0f556b6b1345baa978985f50364d21c140e47eb16d09592b56e96357b0546", kill_on_drop: false }`
[INFO] [stdout] fdf0f556b6b1345baa978985f50364d21c140e47eb16d09592b56e96357b0546
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 435a5da853db70667d6a5fe0377bcaa9e30124cb67c08ad586c9ba2ad867eacb
[INFO] running `Command { std: "docker" "start" "-a" "435a5da853db70667d6a5fe0377bcaa9e30124cb67c08ad586c9ba2ad867eacb", kill_on_drop: false }`
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking chatserver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `message_len` is never read
[INFO] [stdout]    --> src/main.rs:138:41
[INFO] [stdout]     |
[INFO] [stdout] 138 | ...                   let mut message_len: usize = 0;
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `message_len` is never read
[INFO] [stdout]    --> src/main.rs:138:41
[INFO] [stdout]     |
[INFO] [stdout] 138 | ...                   let mut message_len: usize = 0;
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.92s
[INFO] running `Command { std: "docker" "inspect" "435a5da853db70667d6a5fe0377bcaa9e30124cb67c08ad586c9ba2ad867eacb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "435a5da853db70667d6a5fe0377bcaa9e30124cb67c08ad586c9ba2ad867eacb", kill_on_drop: false }`
[INFO] [stdout] 435a5da853db70667d6a5fe0377bcaa9e30124cb67c08ad586c9ba2ad867eacb