[INFO] cloning repository https://github.com/RobotDisco/rust_chat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RobotDisco/rust_chat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRobotDisco%2Frust_chat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRobotDisco%2Frust_chat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b039b619dc4f0f297228d09a894a0c41808447a9
[INFO] checking RobotDisco/rust_chat against try#b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8 for pr-78363
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRobotDisco%2Frust_chat" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RobotDisco/rust_chat on toolchain b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/RobotDisco/rust_chat
[INFO] finished tweaking git repo https://github.com/RobotDisco/rust_chat
[INFO] tweaked toml for git repo https://github.com/RobotDisco/rust_chat written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/RobotDisco/rust_chat already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded slab v0.1.3
[INFO] [stderr]   Downloaded gcc v0.3.54
[INFO] [stderr]   Downloaded bytes v0.3.0
[INFO] [stderr]   Downloaded mio v0.5.1
[INFO] [stderr]   Downloaded nix v0.5.1
[INFO] [stderr]   Downloaded sha1 v0.1.1
[INFO] [stderr]   Downloaded http-muncher v0.2.5
[INFO] [stderr]   Downloaded miow v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9e0f63e83c43a875c30bb1bb05c773efafff5a3af667f69c75f02d7674afdbd6
[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" "9e0f63e83c43a875c30bb1bb05c773efafff5a3af667f69c75f02d7674afdbd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e0f63e83c43a875c30bb1bb05c773efafff5a3af667f69c75f02d7674afdbd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e0f63e83c43a875c30bb1bb05c773efafff5a3af667f69c75f02d7674afdbd6", kill_on_drop: false }`
[INFO] [stdout] 9e0f63e83c43a875c30bb1bb05c773efafff5a3af667f69c75f02d7674afdbd6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+b2c2190fa7bf856bb0ed5e8806266e3a2135c6f8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c34dda13b26bc74698d119f84fd8fcab67e8bdbc5f87708f9e53cb22cf000ca3
[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" "c34dda13b26bc74698d119f84fd8fcab67e8bdbc5f87708f9e53cb22cf000ca3", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking sha1 v0.1.1
[INFO] [stderr]    Compiling http-muncher v0.2.5
[INFO] [stderr]     Checking nix v0.5.1
[INFO] [stderr]     Checking log v0.4.4
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking miow v0.1.5
[INFO] [stderr]     Checking mio v0.5.1
[INFO] [stderr]     Checking chat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:192:25
[INFO] [stdout]     |
[INFO] [stdout] 192 |                     let mut client = self.clients.get_mut(&token).unwrap();
[INFO] [stdout]     |                         ----^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:192:25
[INFO] [stdout]     |
[INFO] [stdout] 192 |                     let mut client = self.clients.get_mut(&token).unwrap();
[INFO] [stdout]     |                         ----^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.98s
[INFO] running `Command { std: "docker" "inspect" "c34dda13b26bc74698d119f84fd8fcab67e8bdbc5f87708f9e53cb22cf000ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c34dda13b26bc74698d119f84fd8fcab67e8bdbc5f87708f9e53cb22cf000ca3", kill_on_drop: false }`
[INFO] [stdout] c34dda13b26bc74698d119f84fd8fcab67e8bdbc5f87708f9e53cb22cf000ca3