[INFO] cloning repository https://github.com/EstebanBorai/low-level-chat-solution
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EstebanBorai/low-level-chat-solution" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Flow-level-chat-solution", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Flow-level-chat-solution'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2366ea961b5b25b8f2804dee373718ea079d4e4d
[INFO] checking EstebanBorai/low-level-chat-solution against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Flow-level-chat-solution" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EstebanBorai/low-level-chat-solution on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/EstebanBorai/low-level-chat-solution
[INFO] finished tweaking git repo https://github.com/EstebanBorai/low-level-chat-solution
[INFO] tweaked toml for git repo https://github.com/EstebanBorai/low-level-chat-solution written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/EstebanBorai/low-level-chat-solution already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07d427884233887d8bc30f9a20aa0f3a43486879e891e4cb7367023591d5a87d
[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" "07d427884233887d8bc30f9a20aa0f3a43486879e891e4cb7367023591d5a87d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07d427884233887d8bc30f9a20aa0f3a43486879e891e4cb7367023591d5a87d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07d427884233887d8bc30f9a20aa0f3a43486879e891e4cb7367023591d5a87d", kill_on_drop: false }`
[INFO] [stdout] 07d427884233887d8bc30f9a20aa0f3a43486879e891e4cb7367023591d5a87d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c280c34e5a3993a570d9919cf78109fd73da4fc62819f2f681f6f584d432db68
[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" "c280c34e5a3993a570d9919cf78109fd73da4fc62819f2f681f6f584d432db68", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking bitflags v0.4.0
[INFO] [stderr]     Checking slab v0.1.3
[INFO] [stderr]     Checking bytes v0.3.0
[INFO] [stderr]    Compiling http-muncher v0.2.5
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking sha1 v0.1.1
[INFO] [stderr]     Checking net2 v0.2.35
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking nix v0.5.1
[INFO] [stderr]     Checking miow v0.1.5
[INFO] [stderr]     Checking mio v0.5.1
[INFO] [stderr]     Checking low-level-websocket-solution v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/server.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 token => {
[INFO] [stdout]    |                 ----- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 72 |                 _ => println!("Received invalid token: {:?}", token),
[INFO] [stdout]    |                 ^ unreachable pattern
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/server.rs:77:17
[INFO] [stdout]    |
[INFO] [stdout] 77 |             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: function is never used: `gen_key`
[INFO] [stdout]  --> src/security.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn gen_key(key: &String) -> String {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/server.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 token => {
[INFO] [stdout]    |                 ----- matches any value
[INFO] [stdout] ...
[INFO] [stdout] 72 |                 _ => println!("Received invalid token: {:?}", token),
[INFO] [stdout]    |                 ^ unreachable pattern
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/server.rs:77:17
[INFO] [stdout]    |
[INFO] [stdout] 77 |             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: function is never used: `gen_key`
[INFO] [stdout]  --> src/security.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn gen_key(key: &String) -> String {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.39s
[INFO] running `Command { std: "docker" "inspect" "c280c34e5a3993a570d9919cf78109fd73da4fc62819f2f681f6f584d432db68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c280c34e5a3993a570d9919cf78109fd73da4fc62819f2f681f6f584d432db68", kill_on_drop: false }`
[INFO] [stdout] c280c34e5a3993a570d9919cf78109fd73da4fc62819f2f681f6f584d432db68