[INFO] fetching crate drumbeat 0.1.1...
[INFO] checking drumbeat-0.1.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate drumbeat 0.1.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate drumbeat 0.1.1 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate drumbeat 0.1.1
[INFO] finished tweaking crates.io crate drumbeat 0.1.1
[INFO] tweaked toml for crates.io crate drumbeat 0.1.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate drumbeat 0.1.1 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c6b535a75abc6aa290dd5bc01b9a05237fe44bc86f821ea517fa7e875c63e145
[INFO] running `Command { std: "docker" "start" "-a" "c6b535a75abc6aa290dd5bc01b9a05237fe44bc86f821ea517fa7e875c63e145", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6b535a75abc6aa290dd5bc01b9a05237fe44bc86f821ea517fa7e875c63e145", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6b535a75abc6aa290dd5bc01b9a05237fe44bc86f821ea517fa7e875c63e145", kill_on_drop: false }`
[INFO] [stdout] c6b535a75abc6aa290dd5bc01b9a05237fe44bc86f821ea517fa7e875c63e145
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d08a9e1416550026061d01c239d6284229592391cd48be7c1f6fca982180cb56
[INFO] running `Command { std: "docker" "start" "-a" "d08a9e1416550026061d01c239d6284229592391cd48be7c1f6fca982180cb56", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.89
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking drumbeat v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `DispatcherType` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:739:42
[INFO] [stdout]     |
[INFO] [stdout] 738 |   use super::*;
[INFO] [stdout]     |       -------- the item `DispatcherType` is already imported here
[INFO] [stdout] 739 |   use crate::event::dispatcher::{create, DispatcherType};
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `make_scheduler` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:740:33
[INFO] [stdout]     |
[INFO] [stdout] 738 |   use super::*;
[INFO] [stdout]     |       -------- the item `make_scheduler` is already imported here
[INFO] [stdout] 739 |   use crate::event::dispatcher::{create, DispatcherType};
[INFO] [stdout] 740 |   use crate::event::scheduler::{make_scheduler, SchedulerType};
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `SchedulerType` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:740:49
[INFO] [stdout]     |
[INFO] [stdout] 738 |   use super::*;
[INFO] [stdout]     |       -------- the item `SchedulerType` is already imported here
[INFO] [stdout] 739 |   use crate::event::dispatcher::{create, DispatcherType};
[INFO] [stdout] 740 |   use crate::event::scheduler::{make_scheduler, SchedulerType};
[INFO] [stdout]     |                                                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `DispatcherType` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:755:7
[INFO] [stdout]     |
[INFO] [stdout] 754 |   use super::*;
[INFO] [stdout]     |       -------- the item `DispatcherType` is already imported here
[INFO] [stdout] 755 |   use crate::event::dispatcher::DispatcherType;
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/event/subject.rs:467:7
[INFO] [stdout]     |
[INFO] [stdout] 463 |   use super::*;
[INFO] [stdout]     |       -------- the item `Arc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 467 |   use std::sync::Arc;
[INFO] [stdout]     |       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `children` is never used
[INFO] [stdout]   --> src/event/dispatcher.rs:77:6
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub(super) trait Dispatcher<T>: Replicable + Send + Sync
[INFO] [stdout]    |                  ---------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 77 |   fn children(&self) -> Iter<'_, DispatchTarget<T>>;
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `children` is never used
[INFO] [stdout]   --> src/event/dispatcher.rs:77:6
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub(super) trait Dispatcher<T>: Replicable + Send + Sync
[INFO] [stdout]    |                  ---------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 77 |   fn children(&self) -> Iter<'_, DispatchTarget<T>>;
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.46s
[INFO] running `Command { std: "docker" "inspect" "d08a9e1416550026061d01c239d6284229592391cd48be7c1f6fca982180cb56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d08a9e1416550026061d01c239d6284229592391cd48be7c1f6fca982180cb56", kill_on_drop: false }`
[INFO] [stdout] d08a9e1416550026061d01c239d6284229592391cd48be7c1f6fca982180cb56
[INFO] checking drumbeat-0.1.1 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate drumbeat 0.1.1 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate drumbeat 0.1.1 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate drumbeat 0.1.1
[INFO] finished tweaking crates.io crate drumbeat 0.1.1
[INFO] tweaked toml for crates.io crate drumbeat 0.1.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate drumbeat 0.1.1 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b42d0d737b06d7ea62016dce129b6ebe64b59ecbd2da3a06e4df28b0f6114e4
[INFO] running `Command { std: "docker" "start" "-a" "3b42d0d737b06d7ea62016dce129b6ebe64b59ecbd2da3a06e4df28b0f6114e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b42d0d737b06d7ea62016dce129b6ebe64b59ecbd2da3a06e4df28b0f6114e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b42d0d737b06d7ea62016dce129b6ebe64b59ecbd2da3a06e4df28b0f6114e4", kill_on_drop: false }`
[INFO] [stdout] 3b42d0d737b06d7ea62016dce129b6ebe64b59ecbd2da3a06e4df28b0f6114e4
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 40462fcac2c5c76545532233923e6f58bf379db453af273266b65f4914c38610
[INFO] running `Command { std: "docker" "start" "-a" "40462fcac2c5c76545532233923e6f58bf379db453af273266b65f4914c38610", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.89
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking drumbeat v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `DispatcherType` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:739:42
[INFO] [stdout]     |
[INFO] [stdout] 738 |   use super::*;
[INFO] [stdout]     |       -------- the item `DispatcherType` is already imported here
[INFO] [stdout] 739 |   use crate::event::dispatcher::{create, DispatcherType};
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `make_scheduler` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:740:33
[INFO] [stdout]     |
[INFO] [stdout] 738 |   use super::*;
[INFO] [stdout]     |       -------- the item `make_scheduler` is already imported here
[INFO] [stdout] 739 |   use crate::event::dispatcher::{create, DispatcherType};
[INFO] [stdout] 740 |   use crate::event::scheduler::{make_scheduler, SchedulerType};
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `SchedulerType` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:740:49
[INFO] [stdout]     |
[INFO] [stdout] 738 |   use super::*;
[INFO] [stdout]     |       -------- the item `SchedulerType` is already imported here
[INFO] [stdout] 739 |   use crate::event::dispatcher::{create, DispatcherType};
[INFO] [stdout] 740 |   use crate::event::scheduler::{make_scheduler, SchedulerType};
[INFO] [stdout]     |                                                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `DispatcherType` is imported redundantly
[INFO] [stdout]    --> src/event/observable.rs:755:7
[INFO] [stdout]     |
[INFO] [stdout] 754 |   use super::*;
[INFO] [stdout]     |       -------- the item `DispatcherType` is already imported here
[INFO] [stdout] 755 |   use crate::event::dispatcher::DispatcherType;
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Arc` is imported redundantly
[INFO] [stdout]    --> src/event/subject.rs:467:7
[INFO] [stdout]     |
[INFO] [stdout] 463 |   use super::*;
[INFO] [stdout]     |       -------- the item `Arc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 467 |   use std::sync::Arc;
[INFO] [stdout]     |       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/utils/testing.rs:84:45
[INFO] [stdout]    |
[INFO] [stdout] 84 |     interrupt_after(Duration::from_secs(1), || {
[INFO] [stdout]    |                                             ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `utils::testing::interrupt_after`
[INFO] [stdout]   --> src/utils/testing.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn interrupt_after<T, F>(d: Duration, f: F) -> T
[INFO] [stdout]    |        --------------- required by a bound in this function
[INFO] [stdout] 37 | where
[INFO] [stdout] 38 |   T: Send + 'static,
[INFO] [stdout]    |      ^^^^ required by this bound in `interrupt_after`
[INFO] [stdout] help: try giving this closure an explicit return type
[INFO] [stdout]    |
[INFO] [stdout] 84 |     interrupt_after(Duration::from_secs(1), || -> /* Type */ {
[INFO] [stdout]    |                                                +++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `children` is never used
[INFO] [stdout]   --> src/event/dispatcher.rs:77:6
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub(super) trait Dispatcher<T>: Replicable + Send + Sync
[INFO] [stdout]    |                  ---------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 77 |   fn children(&self) -> Iter<'_, DispatchTarget<T>>;
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `drumbeat` (lib test) due to 2 previous errors; 5 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "40462fcac2c5c76545532233923e6f58bf379db453af273266b65f4914c38610", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40462fcac2c5c76545532233923e6f58bf379db453af273266b65f4914c38610", kill_on_drop: false }`
[INFO] [stdout] 40462fcac2c5c76545532233923e6f58bf379db453af273266b65f4914c38610