[INFO] fetching crate piscina 0.2.1...
[INFO] checking piscina-0.2.1 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate piscina 0.2.1 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate piscina 0.2.1
[INFO] finished tweaking crates.io crate piscina 0.2.1
[INFO] tweaked toml for crates.io crate piscina 0.2.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate piscina 0.2.1 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "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]      Locking 25 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2a3a68d66dc50d6c28af0b8c2da86bff820be4f707ef4d4f1776c2e105afb22c
[INFO] running `Command { std: "docker" "start" "-a" "2a3a68d66dc50d6c28af0b8c2da86bff820be4f707ef4d4f1776c2e105afb22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a3a68d66dc50d6c28af0b8c2da86bff820be4f707ef4d4f1776c2e105afb22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a3a68d66dc50d6c28af0b8c2da86bff820be4f707ef4d4f1776c2e105afb22c", kill_on_drop: false }`
[INFO] [stdout] 2a3a68d66dc50d6c28af0b8c2da86bff820be4f707ef4d4f1776c2e105afb22c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c050feb17bd81bc2a03847811ebe5ac3a232cfb098fe55fddc8d958f5d7746c6
[INFO] running `Command { std: "docker" "start" "-a" "c050feb17bd81bc2a03847811ebe5ac3a232cfb098fe55fddc8d958f5d7746c6", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking futures-executor v0.3.31
[INFO] [stderr]     Checking piscina v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `pop` is never used
[INFO] [stdout]   --> src/internal.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout]  6 | pub trait PoolStore {
[INFO] [stdout]    |           --------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn pop(&mut self) -> Option<Self::Item>;
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking futures v0.3.31
[INFO] [stderr]     Checking futures-test v0.3.31
[INFO] [stdout] warning: method `pop` is never used
[INFO] [stdout]   --> src/internal.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout]  6 | pub trait PoolStore {
[INFO] [stdout]    |           --------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn pop(&mut self) -> Option<Self::Item>;
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]    --> src/pool.rs:632:9
[INFO] [stdout]     |
[INFO] [stdout] 632 |         drop(item);
[INFO] [stdout]     |         ^^^^^----^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `i32`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_copy_types)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 632 -         drop(item);
[INFO] [stdout] 632 +         let _ = item;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/priority.rs:841:9
[INFO] [stdout]     |
[INFO] [stdout] 841 |         drop(item);
[INFO] [stdout]     |         ^^^^^----^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&str`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 841 -         drop(item);
[INFO] [stdout] 841 +         let _ = item;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.06s
[INFO] running `Command { std: "docker" "inspect" "c050feb17bd81bc2a03847811ebe5ac3a232cfb098fe55fddc8d958f5d7746c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c050feb17bd81bc2a03847811ebe5ac3a232cfb098fe55fddc8d958f5d7746c6", kill_on_drop: false }`
[INFO] [stdout] c050feb17bd81bc2a03847811ebe5ac3a232cfb098fe55fddc8d958f5d7746c6