[INFO] fetching crate byte-sequence 0.2.2...
[INFO] checking byte-sequence-0.2.2 against try#ffa4a0215752773248fb0f0a8092f1c3e7907e9e for pr-75585
[INFO] extracting crate byte-sequence 0.2.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate byte-sequence 0.2.2 on toolchain ffa4a0215752773248fb0f0a8092f1c3e7907e9e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate byte-sequence 0.2.2
[INFO] finished tweaking crates.io crate byte-sequence 0.2.2
[INFO] tweaked toml for crates.io crate byte-sequence 0.2.2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e25907647d9d7f1ab09f6a06a16a90bed962c87c23e85b1b43fa80b048332370
[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" "e25907647d9d7f1ab09f6a06a16a90bed962c87c23e85b1b43fa80b048332370", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e25907647d9d7f1ab09f6a06a16a90bed962c87c23e85b1b43fa80b048332370", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e25907647d9d7f1ab09f6a06a16a90bed962c87c23e85b1b43fa80b048332370", kill_on_drop: false }`
[INFO] [stdout] e25907647d9d7f1ab09f6a06a16a90bed962c87c23e85b1b43fa80b048332370
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+ffa4a0215752773248fb0f0a8092f1c3e7907e9e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c61505b04a119194cda04a5f704835f1fbd7740f52ba8244cdce0004b0de6c8b
[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" "c61505b04a119194cda04a5f704835f1fbd7740f52ba8244cdce0004b0de6c8b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.20
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking miniz_oxide v0.4.1
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking addr2line v0.13.0
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking byte-sequence v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]    --> src/lib.rs:147:17
[INFO] [stdout]     |
[INFO] [stdout] 147 |     use serde::{Deserialize, Deserializer, Serialize, Serializer};
[INFO] [stdout]     |                 ^^^^^^^^^^^                ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Deserializer`
[INFO] [stdout]    --> src/lib.rs:147:30
[INFO] [stdout]     |
[INFO] [stdout] 147 |     use serde::{Deserialize, Deserializer, Serialize, Serializer};
[INFO] [stdout]     |                              ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serializer`
[INFO] [stdout]    --> src/lib.rs:147:55
[INFO] [stdout]     |
[INFO] [stdout] 147 |     use serde::{Deserialize, Deserializer, Serialize, Serializer};
[INFO] [stdout]     |                                                       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.48s
[INFO] running `Command { std: "docker" "inspect" "c61505b04a119194cda04a5f704835f1fbd7740f52ba8244cdce0004b0de6c8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c61505b04a119194cda04a5f704835f1fbd7740f52ba8244cdce0004b0de6c8b", kill_on_drop: false }`
[INFO] [stdout] c61505b04a119194cda04a5f704835f1fbd7740f52ba8244cdce0004b0de6c8b