[INFO] cloning repository https://github.com/mythmon/rearguard
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mythmon/rearguard" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmythmon%2Frearguard", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmythmon%2Frearguard'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7fde477fcbc072af8d710874018045a6a1793903
[INFO] checking mythmon/rearguard against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmythmon%2Frearguard" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mythmon/rearguard on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mythmon/rearguard
[INFO] finished tweaking git repo https://github.com/mythmon/rearguard
[INFO] tweaked toml for git repo https://github.com/mythmon/rearguard written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/mythmon/rearguard already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c9676a908ff5bf6263973c4c7cefda2d11a17f2ccaee28c3f437d16b88ae058
[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" "0c9676a908ff5bf6263973c4c7cefda2d11a17f2ccaee28c3f437d16b88ae058", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c9676a908ff5bf6263973c4c7cefda2d11a17f2ccaee28c3f437d16b88ae058", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c9676a908ff5bf6263973c4c7cefda2d11a17f2ccaee28c3f437d16b88ae058", kill_on_drop: false }`
[INFO] [stdout] 0c9676a908ff5bf6263973c4c7cefda2d11a17f2ccaee28c3f437d16b88ae058
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a05957780bb93b890eed76fa0ddf5ce259c0a052a8d7af217336af5561a8158
[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" "9a05957780bb93b890eed76fa0ddf5ce259c0a052a8d7af217336af5561a8158", kill_on_drop: false }`
[INFO] [stderr]     Checking rearguard v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: cannot find macro `select` in this scope
[INFO] [stdout]   --> src/main.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         select! (
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find macro `select` in this scope
[INFO] [stdout]   --> src/main.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         select! (
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:74:23
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let client_addr = try!(stream.peer_addr());
[INFO] [stdout]    |                       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:75:33
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let reader = BufReader::new(try!(stream.try_clone()));
[INFO] [stdout]    |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:127:5
[INFO] [stdout]     |
[INFO] [stdout] 88  | /     loop {
[INFO] [stdout] 89  | |         select! (
[INFO] [stdout] 90  | |             user_msg = messages_rx.recv() => {
[INFO] [stdout] 91  | |                 let user_msg = user_msg.unwrap_or_else(|e| { panic!(e) });
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |         );
[INFO] [stdout] 125 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 126 | 
[INFO] [stdout] 127 |       println!("{}: disconnected.", client_addr);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find macro `select` in this scope
[INFO] [stdout]   --> src/main.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         select! (
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find macro `select` in this scope
[INFO] [stdout]   --> src/main.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |         select! (
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `core::str::<impl str>::trim_right_matches`: superseded by `trim_end_matches`
[INFO] [stdout]   --> src/message.rs:63:34
[INFO] [stdout]    |
[INFO] [stdout] 63 |         let words: Vec<&str> = s.trim_right_matches("\r").split(" ").collect();
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated associated function: `trim_end_matches`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:74:23
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let client_addr = try!(stream.peer_addr());
[INFO] [stdout]    |                       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:75:33
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let reader = BufReader::new(try!(stream.try_clone()));
[INFO] [stdout]    |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:66:34
[INFO] [stdout]    |
[INFO] [stdout] 66 |         let prefix = if words[i].slice_chars(0, 1) == ":" {
[INFO] [stdout]    |                                  ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:68:31
[INFO] [stdout]    |
[INFO] [stdout] 68 |             Some(words[i - 1].slice_chars(1, words[i - 1].len()).to_string())
[INFO] [stdout]    |                               ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:80:25
[INFO] [stdout]    |
[INFO] [stdout] 80 |             if words[i].slice_chars(0, 1) == ":" {
[INFO] [stdout]    |                         ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:81:48
[INFO] [stdout]    |
[INFO] [stdout] 81 |                 let mut trail_parts = words[i].slice_chars(1, words[i].len()).to_string();
[INFO] [stdout]    |                                                ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:127:5
[INFO] [stdout]     |
[INFO] [stdout] 88  | /     loop {
[INFO] [stdout] 89  | |         select! (
[INFO] [stdout] 90  | |             user_msg = messages_rx.recv() => {
[INFO] [stdout] 91  | |                 let user_msg = user_msg.unwrap_or_else(|e| { panic!(e) });
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |         );
[INFO] [stdout] 125 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 126 | 
[INFO] [stdout] 127 |       println!("{}: disconnected.", client_addr);
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rearguard`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: use of deprecated associated function `core::str::<impl str>::trim_right_matches`: superseded by `trim_end_matches`
[INFO] [stdout]   --> src/message.rs:63:34
[INFO] [stdout]    |
[INFO] [stdout] 63 |         let words: Vec<&str> = s.trim_right_matches("\r").split(" ").collect();
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated associated function: `trim_end_matches`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:66:34
[INFO] [stdout]    |
[INFO] [stdout] 66 |         let prefix = if words[i].slice_chars(0, 1) == ":" {
[INFO] [stdout]    |                                  ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:68:31
[INFO] [stdout]    |
[INFO] [stdout] 68 |             Some(words[i - 1].slice_chars(1, words[i - 1].len()).to_string())
[INFO] [stdout]    |                               ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:80:25
[INFO] [stdout]    |
[INFO] [stdout] 80 |             if words[i].slice_chars(0, 1) == ":" {
[INFO] [stdout]    |                         ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `slice_chars` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/message.rs:81:48
[INFO] [stdout]    |
[INFO] [stdout] 81 |                 let mut trail_parts = words[i].slice_chars(1, words[i].len()).to_string();
[INFO] [stdout]    |                                                ^^^^^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9a05957780bb93b890eed76fa0ddf5ce259c0a052a8d7af217336af5561a8158", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a05957780bb93b890eed76fa0ddf5ce259c0a052a8d7af217336af5561a8158", kill_on_drop: false }`
[INFO] [stdout] 9a05957780bb93b890eed76fa0ddf5ce259c0a052a8d7af217336af5561a8158