[INFO] fetching crate cached 0.18.0...
[INFO] checking cached-0.18.0 against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] extracting crate cached 0.18.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate cached 0.18.0 on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cached 0.18.0
[INFO] finished tweaking crates.io crate cached 0.18.0
[INFO] tweaked toml for crates.io crate cached 0.18.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate cached 0.18.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] eb9f27b8295d8d2724039c12000b1e183e9d8e0aa89fb88c1ce0906d53dd441f
[INFO] running `Command { std: "docker" "start" "-a" "eb9f27b8295d8d2724039c12000b1e183e9d8e0aa89fb88c1ce0906d53dd441f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb9f27b8295d8d2724039c12000b1e183e9d8e0aa89fb88c1ce0906d53dd441f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb9f27b8295d8d2724039c12000b1e183e9d8e0aa89fb88c1ce0906d53dd441f", kill_on_drop: false }`
[INFO] [stdout] eb9f27b8295d8d2724039c12000b1e183e9d8e0aa89fb88c1ce0906d53dd441f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 47976eff1d74b8757255c3aa44687d65b237f52ce36a32e84c5f6baa7d4a01d5
[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" "47976eff1d74b8757255c3aa44687d65b237f52ce36a32e84c5f6baa7d4a01d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking parking v1.0.3
[INFO] [stderr]    Compiling event-listener v2.2.1
[INFO] [stderr]     Checking cache-padded v1.1.0
[INFO] [stderr]     Checking waker-fn v1.0.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking async-task v3.0.0
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking fastrand v1.3.2
[INFO] [stderr]     Checking bytes v0.5.5
[INFO] [stderr]     Checking concurrent-queue v1.1.1
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking async-mutex v1.1.5
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking kv-log-macro v1.0.6
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling cached_proc_macro v0.3.0
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking cached v0.18.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/stores.rs:630:9
[INFO] [stdout]     |
[INFO] [stdout] 630 |         std::mem::replace(self, HashMap::new());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking blocking v0.4.6
[INFO] [stderr]     Checking smol v0.1.18
[INFO] [stderr]     Checking async-std v1.6.2
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/stores.rs:630:9
[INFO] [stdout]     |
[INFO] [stdout] 630 |         std::mem::replace(self, HashMap::new());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 56.13s
[INFO] running `Command { std: "docker" "inspect" "47976eff1d74b8757255c3aa44687d65b237f52ce36a32e84c5f6baa7d4a01d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47976eff1d74b8757255c3aa44687d65b237f52ce36a32e84c5f6baa7d4a01d5", kill_on_drop: false }`
[INFO] [stdout] 47976eff1d74b8757255c3aa44687d65b237f52ce36a32e84c5f6baa7d4a01d5