[INFO] fetching crate async-slot 0.1.0...
[INFO] checking async-slot-0.1.0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate async-slot 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate async-slot 0.1.0 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-slot 0.1.0
[INFO] finished tweaking crates.io crate async-slot 0.1.0
[INFO] tweaked toml for crates.io crate async-slot 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] [stderr]       Adding futures v0.1.31 (latest: v0.3.30)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4ffc3bd01edbc673e1f68a0224f1aa8fb560a3bef899b4ab88fbf9596996361f
[INFO] running `Command { std: "docker" "start" "-a" "4ffc3bd01edbc673e1f68a0224f1aa8fb560a3bef899b4ab88fbf9596996361f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ffc3bd01edbc673e1f68a0224f1aa8fb560a3bef899b4ab88fbf9596996361f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ffc3bd01edbc673e1f68a0224f1aa8fb560a3bef899b4ab88fbf9596996361f", kill_on_drop: false }`
[INFO] [stdout] 4ffc3bd01edbc673e1f68a0224f1aa8fb560a3bef899b4ab88fbf9596996361f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 41cc24ac8ae58c13a5d78ffa861cda87b2d32e0f31c771e82c5bddd23d6a389f
[INFO] running `Command { std: "docker" "start" "-a" "41cc24ac8ae58c13a5d78ffa861cda87b2d32e0f31c771e82c5bddd23d6a389f", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]     Checking async-slot v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `AssertKindsSender` is never used
[INFO] [stdout]   --> src/sync.rs:40:7
[INFO] [stdout]    |
[INFO] [stdout] 40 | trait AssertKindsSender: Send + Sync {}
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AssertKindsReceiver` is never used
[INFO] [stdout]   --> src/sync.rs:43:7
[INFO] [stdout]    |
[INFO] [stdout] 43 | trait AssertKindsReceiver: Send + Sync {}
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AssertKindsSender` is never used
[INFO] [stdout]   --> src/sync.rs:40:7
[INFO] [stdout]    |
[INFO] [stdout] 40 | trait AssertKindsSender: Send + Sync {}
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AssertKindsReceiver` is never used
[INFO] [stdout]   --> src/sync.rs:43:7
[INFO] [stdout]    |
[INFO] [stdout] 43 | trait AssertKindsReceiver: Send + Sync {}
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> tests/slot.rs:203:22
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn list() -> Box<Stream<Item=i32, Error=u32>> {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn list() -> Box<dyn Stream<Item=i32, Error=u32>> {
[INFO] [stdout]     |                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tx` is never read
[INFO] [stdout]    --> tests/slot.rs:139:9
[INFO] [stdout]     |
[INFO] [stdout] 139 |         tx = tx.send(2).wait().unwrap();
[INFO] [stdout]     |         ^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AssertSend` is never used
[INFO] [stdout]   --> tests/slot.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | trait AssertSend: Send {}
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.47s
[INFO] running `Command { std: "docker" "inspect" "41cc24ac8ae58c13a5d78ffa861cda87b2d32e0f31c771e82c5bddd23d6a389f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41cc24ac8ae58c13a5d78ffa861cda87b2d32e0f31c771e82c5bddd23d6a389f", kill_on_drop: false }`
[INFO] [stdout] 41cc24ac8ae58c13a5d78ffa861cda87b2d32e0f31c771e82c5bddd23d6a389f