[INFO] fetching crate vent 0.1.0...
[INFO] checking vent-0.1.0 against try#353a0a223066e9f46a1d935f2271a26c3c5002bb for pr-75180
[INFO] extracting crate vent 0.1.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate vent 0.1.0 on toolchain 353a0a223066e9f46a1d935f2271a26c3c5002bb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vent 0.1.0
[INFO] finished tweaking crates.io crate vent 0.1.0
[INFO] tweaked toml for crates.io crate vent 0.1.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b636069aa4d65d0e23dc514d88ae41840fa0a7986dc4b1f53a82ccfc87274ce9
[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" "b636069aa4d65d0e23dc514d88ae41840fa0a7986dc4b1f53a82ccfc87274ce9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b636069aa4d65d0e23dc514d88ae41840fa0a7986dc4b1f53a82ccfc87274ce9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b636069aa4d65d0e23dc514d88ae41840fa0a7986dc4b1f53a82ccfc87274ce9", kill_on_drop: false }`
[INFO] [stdout] b636069aa4d65d0e23dc514d88ae41840fa0a7986dc4b1f53a82ccfc87274ce9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+353a0a223066e9f46a1d935f2271a26c3c5002bb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e0d0f94e30d1f56a1cbd0ced4b8c1fd93121832a60bb9813fc774df3f13339d
[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" "7e0d0f94e30d1f56a1cbd0ced4b8c1fd93121832a60bb9813fc774df3f13339d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking nix v0.10.0
[INFO] [stderr]     Checking uuid v0.6.5
[INFO] [stderr]     Checking vent v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[macro_use] extern crate serde_derive;
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[macro_use] extern crate serde_derive;
[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 29.51s
[INFO] running `Command { std: "docker" "inspect" "7e0d0f94e30d1f56a1cbd0ced4b8c1fd93121832a60bb9813fc774df3f13339d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e0d0f94e30d1f56a1cbd0ced4b8c1fd93121832a60bb9813fc774df3f13339d", kill_on_drop: false }`
[INFO] [stdout] 7e0d0f94e30d1f56a1cbd0ced4b8c1fd93121832a60bb9813fc774df3f13339d