[INFO] fetching crate json-trait-rs 0.11.0...
[INFO] testing json-trait-rs-0.11.0 against try#8262275854dc0e5381c9d42d56257d94932c5a87 for pr-90799
[INFO] extracting crate json-trait-rs 0.11.0 into /workspace/builds/worker-89/source
[INFO] validating manifest of crates.io crate json-trait-rs 0.11.0 on toolchain 8262275854dc0e5381c9d42d56257d94932c5a87
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-89/source/rust-toolchain
[INFO] started tweaking crates.io crate json-trait-rs 0.11.0
[INFO] finished tweaking crates.io crate json-trait-rs 0.11.0
[INFO] tweaked toml for crates.io crate json-trait-rs 0.11.0 written to /workspace/builds/worker-89/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "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" "+8262275854dc0e5381c9d42d56257d94932c5a87" "fetch" "--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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pyo3-macros v0.15.1
[INFO] [stderr]   Downloaded pyo3-build-config v0.15.1
[INFO] [stderr]   Downloaded pyo3-macros-backend v0.15.1
[INFO] [stderr]   Downloaded pyo3 v0.15.1
[INFO] [stderr]   Downloaded join-lazy-fmt v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 868d31e9d2e651699466f61ed3419279fd7caae50eb12d0012340feb4fdc26e9
[INFO] running `Command { std: "docker" "start" "-a" "868d31e9d2e651699466f61ed3419279fd7caae50eb12d0012340feb4fdc26e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "868d31e9d2e651699466f61ed3419279fd7caae50eb12d0012340feb4fdc26e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "868d31e9d2e651699466f61ed3419279fd7caae50eb12d0012340feb4fdc26e9", kill_on_drop: false }`
[INFO] [stdout] 868d31e9d2e651699466f61ed3419279fd7caae50eb12d0012340feb4fdc26e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-89/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+8262275854dc0e5381c9d42d56257d94932c5a87" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 786b08861d371e8517aa62766f33dc3929f0405b0264eeeaf7ac5aee3e224325
[INFO] running `Command { std: "docker" "start" "-a" "786b08861d371e8517aa62766f33dc3929f0405b0264eeeaf7ac5aee3e224325", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling rustversion v1.0.5
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling gimli v0.26.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.21
[INFO] [stderr]    Compiling join-lazy-fmt v0.9.2
[INFO] [stderr]    Compiling strum v0.23.0
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling object v0.27.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling backtrace v0.3.63
[INFO] [stderr]    Compiling addr2line v0.17.0
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling strum_macros v0.23.1
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling json-trait-rs v0.11.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]   --> src/lib.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | #![feature(specialization)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     warnings,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    = note: `#[deny(incomplete_features)]` implied by `#[deny(warnings)]`
[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] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `json-trait-rs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "786b08861d371e8517aa62766f33dc3929f0405b0264eeeaf7ac5aee3e224325", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "786b08861d371e8517aa62766f33dc3929f0405b0264eeeaf7ac5aee3e224325", kill_on_drop: false }`
[INFO] [stdout] 786b08861d371e8517aa62766f33dc3929f0405b0264eeeaf7ac5aee3e224325