[INFO] updating cached repository https://github.com/echochamber/rust_chat
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 254f76a923455cf4b4a0928e5d5eabe1ae8aeb1a
[INFO] checking echochamber/rust_chat against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fechochamber%2Frust_chat" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/echochamber/rust_chat on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/echochamber/rust_chat
[INFO] finished tweaking git repo https://github.com/echochamber/rust_chat
[INFO] tweaked toml for git repo https://github.com/echochamber/rust_chat written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/echochamber/rust_chat already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/builds/worker-2/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 15b5700c46f96c624fb5716e94411db2d2a4a2f7e64b46fabf7a43fa5477862e
[INFO] running `"docker" "start" "-a" "15b5700c46f96c624fb5716e94411db2d2a4a2f7e64b46fabf7a43fa5477862e"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking mio v0.4.4
[INFO] [stderr]     Checking simple_chat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `EventLoop`, `Token`
[INFO] [stderr]  --> src/chat_server/connection.rs:9:11
[INFO] [stderr]   |
[INFO] [stderr] 9 | use mio::{Token, EventLoop, EventSet, TryRead, TryWrite, PollOpt};
[INFO] [stderr]   |           ^^^^^  ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SERVER_TOKEN`
[INFO] [stderr]   --> src/chat_server/mod.rs:11:20
[INFO] [stderr]    |
[INFO] [stderr] 11 | use self::server::{SERVER_TOKEN, ChatServer};
[INFO] [stderr]    |                    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `EventLoop`, `Token`
[INFO] [stderr]  --> src/chat_server/connection.rs:9:11
[INFO] [stderr]   |
[INFO] [stderr] 9 | use mio::{Token, EventLoop, EventSet, TryRead, TryWrite, PollOpt};
[INFO] [stderr]   |           ^^^^^  ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SERVER_TOKEN`
[INFO] [stderr]   --> src/chat_server/mod.rs:11:20
[INFO] [stderr]    |
[INFO] [stderr] 11 | use self::server::{SERVER_TOKEN, ChatServer};
[INFO] [stderr]    |                    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/chat_server/connection.rs:100:21
[INFO] [stderr]     |
[INFO] [stderr] 100 | /                     return match String::from_utf8(read_buf) {
[INFO] [stderr] 101 | |                         Ok(message) => {
[INFO] [stderr] 102 | |                             return Ok(Some(message));
[INFO] [stderr] 103 | |                         },
[INFO] [stderr] ...   |
[INFO] [stderr] 106 | |                         }
[INFO] [stderr] 107 | |                     }
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/chat_server/connection.rs:100:21
[INFO] [stderr]     |
[INFO] [stderr] 100 | /                     return match String::from_utf8(read_buf) {
[INFO] [stderr] 101 | |                         Ok(message) => {
[INFO] [stderr] 102 | |                             return Ok(Some(message));
[INFO] [stderr] 103 | |                         },
[INFO] [stderr] ...   |
[INFO] [stderr] 106 | |                         }
[INFO] [stderr] 107 | |                     }
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `ip_addr` has been stable since 1.7.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(ip_addr)]
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `convert`
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(convert)]
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: Could not compile `simple_chat`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the feature `ip_addr` has been stable since 1.7.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(ip_addr)]
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `convert`
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(convert)]
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: Could not compile `simple_chat`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "15b5700c46f96c624fb5716e94411db2d2a4a2f7e64b46fabf7a43fa5477862e"`
[INFO] running `"docker" "rm" "-f" "15b5700c46f96c624fb5716e94411db2d2a4a2f7e64b46fabf7a43fa5477862e"`
[INFO] [stdout] 15b5700c46f96c624fb5716e94411db2d2a4a2f7e64b46fabf7a43fa5477862e