[INFO] fetching crate event-emitter-rs 0.1.4...
[INFO] checking event-emitter-rs-0.1.4 against beta for pr-78714
[INFO] extracting crate event-emitter-rs 0.1.4 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate event-emitter-rs 0.1.4 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate event-emitter-rs 0.1.4
[INFO] finished tweaking crates.io crate event-emitter-rs 0.1.4
[INFO] tweaked toml for crates.io crate event-emitter-rs 0.1.4 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cdb62a6809dd71ac5b4def0481768d0a2fbda8b05c37b450f696633b77637e13
[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" "cdb62a6809dd71ac5b4def0481768d0a2fbda8b05c37b450f696633b77637e13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cdb62a6809dd71ac5b4def0481768d0a2fbda8b05c37b450f696633b77637e13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdb62a6809dd71ac5b4def0481768d0a2fbda8b05c37b450f696633b77637e13", kill_on_drop: false }`
[INFO] [stdout] cdb62a6809dd71ac5b4def0481768d0a2fbda8b05c37b450f696633b77637e13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 924ccbb8f3fedaa7ffd5e78eb0c4ff83a7234e5274fcb0cb3a82716a4c537de5
[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" "924ccbb8f3fedaa7ffd5e78eb0c4ff83a7234e5274fcb0cb3a82716a4c537de5", kill_on_drop: false }`
[INFO] [stderr]     Checking serde v1.0.117
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking event-emitter-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::EventEmitter`
[INFO] [stdout]  --> src/tests.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::EventEmitter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]  --> src/tests.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`
[INFO] [stdout]  --> src/tests.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Mutex, Arc};
[INFO] [stdout]   |                 ^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]  --> src/tests.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]    --> src/lib.rs:331:32
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:331:45
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]    --> src/lib.rs:331:32
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:331:45
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/tests.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut counter: Arc<Mutex<u32>> = Arc::new(Mutex::new(5));
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/tests.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut container: Arc<Mutex<Container>> = Arc::new(Mutex::new(Container { list: Vec::new() }));
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tests.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let mut counter: Arc<Mutex<u32>> = Arc::new(Mutex::new(5));
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/tests.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         callback.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/tests.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |         callback.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.54s
[INFO] running `Command { std: "docker" "inspect" "924ccbb8f3fedaa7ffd5e78eb0c4ff83a7234e5274fcb0cb3a82716a4c537de5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "924ccbb8f3fedaa7ffd5e78eb0c4ff83a7234e5274fcb0cb3a82716a4c537de5", kill_on_drop: false }`
[INFO] [stdout] 924ccbb8f3fedaa7ffd5e78eb0c4ff83a7234e5274fcb0cb3a82716a4c537de5