[INFO] fetching crate imprint 0.2.0...
[INFO] checking imprint-0.2.0 against try#9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c for pr-79472
[INFO] extracting crate imprint 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate imprint 0.2.0 on toolchain 9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate imprint 0.2.0
[INFO] finished tweaking crates.io crate imprint 0.2.0
[INFO] tweaked toml for crates.io crate imprint 0.2.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "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] 169ce1960e2226229ec963afc99e3e071e5064c6acecde9177747c4fc244468d
[INFO] running `Command { std: "docker" "start" "-a" "169ce1960e2226229ec963afc99e3e071e5064c6acecde9177747c4fc244468d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "169ce1960e2226229ec963afc99e3e071e5064c6acecde9177747c4fc244468d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "169ce1960e2226229ec963afc99e3e071e5064c6acecde9177747c4fc244468d", kill_on_drop: false }`
[INFO] [stdout] 169ce1960e2226229ec963afc99e3e071e5064c6acecde9177747c4fc244468d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d83f12a795a58caf2ab3b6477af40fdf4db3b3a986b821e6e7a75756734b56bb
[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" "d83f12a795a58caf2ab3b6477af40fdf4db3b3a986b821e6e7a75756734b56bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking imprint v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `mem` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:427:19
[INFO] [stdout]     |
[INFO] [stdout] 22  | use std::{fmt, mem};
[INFO] [stdout]     |                --- the item `mem` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 427 |         use std::{mem, ptr};
[INFO] [stdout]     |                   ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `mem` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:427:19
[INFO] [stdout]     |
[INFO] [stdout] 22  | use std::{fmt, mem};
[INFO] [stdout]     |                --- the item `mem` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 427 |         use std::{mem, ptr};
[INFO] [stdout]     |                   ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.64s
[INFO] running `Command { std: "docker" "inspect" "d83f12a795a58caf2ab3b6477af40fdf4db3b3a986b821e6e7a75756734b56bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d83f12a795a58caf2ab3b6477af40fdf4db3b3a986b821e6e7a75756734b56bb", kill_on_drop: false }`
[INFO] [stdout] d83f12a795a58caf2ab3b6477af40fdf4db3b3a986b821e6e7a75756734b56bb