[INFO] cloning repository https://github.com/angelozdev/observer_pattern_rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/angelozdev/observer_pattern_rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangelozdev%2Fobserver_pattern_rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangelozdev%2Fobserver_pattern_rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f242216271f7c67f7ba61b19e9757ba979cc76cb
[INFO] checking angelozdev/observer_pattern_rs against try#b4c55082edd8dec08ce8af276d7054d9c4db20c4 for pr-147984
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangelozdev%2Fobserver_pattern_rs" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/angelozdev/observer_pattern_rs
[INFO] finished tweaking git repo https://github.com/angelozdev/observer_pattern_rs
[INFO] tweaked toml for git repo https://github.com/angelozdev/observer_pattern_rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/angelozdev/observer_pattern_rs on toolchain b4c55082edd8dec08ce8af276d7054d9c4db20c4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b4c55082edd8dec08ce8af276d7054d9c4db20c4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/angelozdev/observer_pattern_rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b4c55082edd8dec08ce8af276d7054d9c4db20c4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking angelozdev/observer_pattern_rs against try#b4c55082edd8dec08ce8af276d7054d9c4db20c4 for pr-147984
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fangelozdev%2Fobserver_pattern_rs" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/angelozdev/observer_pattern_rs
[INFO] finished tweaking git repo https://github.com/angelozdev/observer_pattern_rs
[INFO] tweaked toml for git repo https://github.com/angelozdev/observer_pattern_rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/angelozdev/observer_pattern_rs on toolchain b4c55082edd8dec08ce8af276d7054d9c4db20c4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b4c55082edd8dec08ce8af276d7054d9c4db20c4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/angelozdev/observer_pattern_rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b4c55082edd8dec08ce8af276d7054d9c4db20c4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b4c55082edd8dec08ce8af276d7054d9c4db20c4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04fe2e39fba13135f10bedb8ad65bce1a07fc58147aa551ab6a2017b56e5f764
[INFO] running `Command { std: "docker" "start" "-a" "04fe2e39fba13135f10bedb8ad65bce1a07fc58147aa551ab6a2017b56e5f764", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04fe2e39fba13135f10bedb8ad65bce1a07fc58147aa551ab6a2017b56e5f764", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04fe2e39fba13135f10bedb8ad65bce1a07fc58147aa551ab6a2017b56e5f764", kill_on_drop: false }`
[INFO] [stdout] 04fe2e39fba13135f10bedb8ad65bce1a07fc58147aa551ab6a2017b56e5f764
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b4c55082edd8dec08ce8af276d7054d9c4db20c4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aaf05ce19ea3a17b3291e9539b5b3bae10ad3466a6cc7ff84a4985b283a765c5
[INFO] running `Command { std: "docker" "start" "-a" "aaf05ce19ea3a17b3291e9539b5b3bae10ad3466a6cc7ff84a4985b283a765c5", kill_on_drop: false }`
[INFO] [stderr]     Checking observer_pattern v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `unsubscribe` and `notify_to` are never used
[INFO] [stdout]   --> src/main.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout]  7 | trait Publisher<T>
[INFO] [stdout]    |       --------- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn unsubscribe(&mut self, id: u64) -> Result<(), SubscriptionError>;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 13 |     fn notify(&self, msg: &str);
[INFO] [stdout] 14 |     fn notify_to(&self, id: u64, msg: &str) -> Result<(), SubscriptionError>;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:19:23
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadySubscribed(u64),
[INFO] [stdout]    |     ----------------- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SubscriptionError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 19 -     AlreadySubscribed(u64),
[INFO] [stdout] 19 +     AlreadySubscribed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `NotSubscribed` and `InvalidId` are never constructed
[INFO] [stdout]   --> src/main.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum SubscriptionError {
[INFO] [stdout]    |      ----------------- variants in this enum
[INFO] [stdout] 19 |     AlreadySubscribed(u64),
[INFO] [stdout] 20 |     NotSubscribed(u64),
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 21 |     InvalidId(u64),
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SubscriptionError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `unsubscribe` and `notify_to` are never used
[INFO] [stdout]   --> src/main.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout]  7 | trait Publisher<T>
[INFO] [stdout]    |       --------- methods in this trait
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn unsubscribe(&mut self, id: u64) -> Result<(), SubscriptionError>;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 13 |     fn notify(&self, msg: &str);
[INFO] [stdout] 14 |     fn notify_to(&self, id: u64, msg: &str) -> Result<(), SubscriptionError>;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/main.rs:19:23
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadySubscribed(u64),
[INFO] [stdout]    |     ----------------- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SubscriptionError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 19 -     AlreadySubscribed(u64),
[INFO] [stdout] 19 +     AlreadySubscribed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `NotSubscribed` and `InvalidId` are never constructed
[INFO] [stdout]   --> src/main.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum SubscriptionError {
[INFO] [stdout]    |      ----------------- variants in this enum
[INFO] [stdout] 19 |     AlreadySubscribed(u64),
[INFO] [stdout] 20 |     NotSubscribed(u64),
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 21 |     InvalidId(u64),
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SubscriptionError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "aaf05ce19ea3a17b3291e9539b5b3bae10ad3466a6cc7ff84a4985b283a765c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aaf05ce19ea3a17b3291e9539b5b3bae10ad3466a6cc7ff84a4985b283a765c5", kill_on_drop: false }`
[INFO] [stdout] aaf05ce19ea3a17b3291e9539b5b3bae10ad3466a6cc7ff84a4985b283a765c5