[INFO] fetching crate im-rc 15.1.0...
[INFO] checking im-rc-15.1.0 against master#e4106065bf1bb515935d5d024e8d9c86454e2b22 for pr-112160
[INFO] extracting crate im-rc 15.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate im-rc 15.1.0 on toolchain e4106065bf1bb515935d5d024e8d9c86454e2b22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate im-rc 15.1.0
[INFO] finished tweaking crates.io crate im-rc 15.1.0
[INFO] tweaked toml for crates.io crate im-rc 15.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded refpool v0.4.3
[INFO] [stderr]   Downloaded proptest-derive v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b4e35c65a74062cb5c25815c1650b07ebf9a4ed0a76c2b07aa97d1e69b374414
[INFO] running `Command { std: "docker" "start" "-a" "b4e35c65a74062cb5c25815c1650b07ebf9a4ed0a76c2b07aa97d1e69b374414", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4e35c65a74062cb5c25815c1650b07ebf9a4ed0a76c2b07aa97d1e69b374414", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4e35c65a74062cb5c25815c1650b07ebf9a4ed0a76c2b07aa97d1e69b374414", kill_on_drop: false }`
[INFO] [stdout] b4e35c65a74062cb5c25815c1650b07ebf9a4ed0a76c2b07aa97d1e69b374414
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 60c4dad877041544ee24a678154ff58cd2978a1200d7ebf00129285e75617458
[INFO] running `Command { std: "docker" "start" "-a" "60c4dad877041544ee24a678154ff58cd2978a1200d7ebf00129285e75617458", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.145
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling rustix v0.37.19
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking linux-raw-sys v0.3.8
[INFO] [stderr]    Compiling libm v0.2.7
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling rayon-core v1.11.0
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]    Compiling memoffset v0.8.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.14
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling serde v1.0.163
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]    Compiling im-rc v15.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]    Compiling serde_json v1.0.96
[INFO] [stderr]     Checking bit-set v0.5.3
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]     Checking itoa v1.0.6
[INFO] [stderr]     Checking either v1.8.1
[INFO] [stderr]     Checking unarray v0.1.4
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking metrohash v1.0.6
[INFO] [stderr]     Checking pretty_assertions v1.3.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.8
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking crossbeam-deque v0.8.3
[INFO] [stderr]     Checking bitmaps v2.1.0
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking num_cpus v1.15.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_xoshiro v0.6.0
[INFO] [stderr]     Checking rand_xorshift v0.3.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking sized-chunks v0.6.5
[INFO] [stderr]     Checking rayon v1.7.0
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]    --> src/lib.rs:341:41
[INFO] [stdout]     |
[INFO] [stdout] 341 | #![cfg_attr(has_specialisation, feature(specialization))]
[INFO] [stdout]     |                                         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]     = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tempfile v3.5.0
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking proptest v1.2.0
[INFO] [stderr]    Compiling proptest-derive v0.3.0
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]    --> src/lib.rs:341:41
[INFO] [stdout]     |
[INFO] [stdout] 341 | #![cfg_attr(has_specialisation, feature(specialization))]
[INFO] [stdout]     |                                         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout]     = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.48s
[INFO] running `Command { std: "docker" "inspect" "60c4dad877041544ee24a678154ff58cd2978a1200d7ebf00129285e75617458", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60c4dad877041544ee24a678154ff58cd2978a1200d7ebf00129285e75617458", kill_on_drop: false }`
[INFO] [stdout] 60c4dad877041544ee24a678154ff58cd2978a1200d7ebf00129285e75617458