[INFO] fetching crate maybe-single 0.12.0... [INFO] checking maybe-single-0.12.0 against beta for pr-78714 [INFO] extracting crate maybe-single 0.12.0 into /workspace/builds/worker-9/source [INFO] validating manifest of crates.io crate maybe-single 0.12.0 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 maybe-single 0.12.0 [INFO] finished tweaking crates.io crate maybe-single 0.12.0 [INFO] tweaked toml for crates.io crate maybe-single 0.12.0 written to /workspace/builds/worker-9/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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] b7802fd58e0acc01007ae3ef7c6a5ab2a2f85d5f355605f0e8521110a511bce4 [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" "b7802fd58e0acc01007ae3ef7c6a5ab2a2f85d5f355605f0e8521110a511bce4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "b7802fd58e0acc01007ae3ef7c6a5ab2a2f85d5f355605f0e8521110a511bce4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b7802fd58e0acc01007ae3ef7c6a5ab2a2f85d5f355605f0e8521110a511bce4", kill_on_drop: false }` [INFO] [stdout] b7802fd58e0acc01007ae3ef7c6a5ab2a2f85d5f355605f0e8521110a511bce4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] a480ae50ec9dfede8d807e60a820ea7935517660668bcadf9ace1c2d57856318 [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" "a480ae50ec9dfede8d807e60a820ea7935517660668bcadf9ace1c2d57856318", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.48 [INFO] [stderr] Checking smallvec v1.4.2 [INFO] [stderr] Checking ppv-lite86 v0.2.10 [INFO] [stderr] Checking once_cell v1.5.2 [INFO] [stderr] Checking signal-hook-registry v1.2.2 [INFO] [stderr] Checking getrandom v0.1.15 [INFO] [stderr] Checking parking_lot_core v0.7.2 [INFO] [stderr] Checking rand_core v0.5.1 [INFO] [stderr] Checking parking_lot v0.10.2 [INFO] [stderr] Checking maybe-single v0.12.0 (/opt/rustwide/workdir) [INFO] [stderr] Checking rand_chacha v0.2.2 [INFO] [stdout] warning: unused import: `std::ops::Deref` [INFO] [stdout] --> src/nio.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::ops::Deref; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused imports: `RwLockReadGuard`, `RwLockWriteGuard` [INFO] [stdout] --> src/nio.rs:6:34 [INFO] [stdout] | [INFO] [stdout] 6 | use parking_lot::{Mutex, RwLock, RwLockReadGuard, RwLockWriteGuard}; [INFO] [stdout] | ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `read_lock` [INFO] [stdout] --> src/lib.rs:77:5 [INFO] [stdout] | [INFO] [stdout] 77 | read_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `write_lock` [INFO] [stdout] --> src/lib.rs:78:5 [INFO] [stdout] | [INFO] [stdout] 78 | write_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking rand v0.7.3 [INFO] [stderr] Compiling tokio-macros v0.2.6 [INFO] [stderr] Checking tokio v0.2.23 [INFO] [stdout] warning: unused import: `std::ops::Deref` [INFO] [stdout] --> src/nio.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::ops::Deref; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused imports: `RwLockReadGuard`, `RwLockWriteGuard` [INFO] [stdout] --> src/nio.rs:6:34 [INFO] [stdout] | [INFO] [stdout] 6 | use parking_lot::{Mutex, RwLock, RwLockReadGuard, RwLockWriteGuard}; [INFO] [stdout] | ^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused imports: `Rng`, `thread_rng` [INFO] [stdout] --> src/nio.rs:87:16 [INFO] [stdout] | [INFO] [stdout] 87 | use rand::{thread_rng, Rng}; [INFO] [stdout] | ^^^^^^^^^^ ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::thread::sleep` [INFO] [stdout] --> src/nio.rs:88:9 [INFO] [stdout] | [INFO] [stdout] 88 | use std::thread::sleep; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Duration` [INFO] [stdout] --> src/nio.rs:89:9 [INFO] [stdout] | [INFO] [stdout] 89 | use std::time::Duration; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `tokio::time::Instant` [INFO] [stdout] --> src/nio.rs:90:9 [INFO] [stdout] | [INFO] [stdout] 90 | use tokio::time::Instant; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::future::Future` [INFO] [stdout] --> src/lib.rs:119:9 [INFO] [stdout] | [INFO] [stdout] 119 | use std::future::Future; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::pin::Pin` [INFO] [stdout] --> src/lib.rs:120:9 [INFO] [stdout] | [INFO] [stdout] 120 | use std::pin::Pin; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `read_lock` [INFO] [stdout] --> src/lib.rs:77:5 [INFO] [stdout] | [INFO] [stdout] 77 | read_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `write_lock` [INFO] [stdout] --> src/lib.rs:78:5 [INFO] [stdout] | [INFO] [stdout] 78 | write_lock: Option>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 21.87s [INFO] running `Command { std: "docker" "inspect" "a480ae50ec9dfede8d807e60a820ea7935517660668bcadf9ace1c2d57856318", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a480ae50ec9dfede8d807e60a820ea7935517660668bcadf9ace1c2d57856318", kill_on_drop: false }` [INFO] [stdout] a480ae50ec9dfede8d807e60a820ea7935517660668bcadf9ace1c2d57856318