[INFO] fetching crate refs 0.51.0...
[INFO] checking refs-0.51.0 against 1.95.0 for pr-155915
[INFO] extracting crate refs 0.51.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate refs 0.51.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate refs 0.51.0
[INFO] tweaked toml for crates.io crate refs 0.51.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate refs 0.51.0 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate refs 0.51.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-test-shared v0.2.114
[INFO] [stderr]   Downloaded wasm-bindgen-test-macro v0.3.64
[INFO] [stderr]   Downloaded hreads v0.13.0
[INFO] [stderr]   Downloaded wasm-bindgen-test v0.3.64
[INFO] [stderr]   Downloaded plat v0.8.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 65e3e8b400ae57565b872982d1273ba7187c4e20b3978c9a44025d0db2a29171
[INFO] running `Command { std: "docker" "start" "-a" "65e3e8b400ae57565b872982d1273ba7187c4e20b3978c9a44025d0db2a29171", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65e3e8b400ae57565b872982d1273ba7187c4e20b3978c9a44025d0db2a29171", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65e3e8b400ae57565b872982d1273ba7187c4e20b3978c9a44025d0db2a29171", kill_on_drop: false }`
[INFO] [stdout] 65e3e8b400ae57565b872982d1273ba7187c4e20b3978c9a44025d0db2a29171
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0c934f609428804a76459bef0ad1a85bcb8bcdb6bf65d41479a516006b7be4c
[INFO] running `Command { std: "docker" "start" "-a" "d0c934f609428804a76459bef0ad1a85bcb8bcdb6bf65d41479a516006b7be4c", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-channel v0.3.32
[INFO] [stderr]    Compiling aws-lc-rs v1.16.0
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.114
[INFO] [stderr]     Checking http v1.4.0
[INFO] [stderr]    Compiling jobserver v0.1.34
[INFO] [stderr]     Checking parking_lot_core v0.9.12
[INFO] [stderr]     Checking errno v0.3.14
[INFO] [stderr]     Checking socket2 v0.6.2
[INFO] [stderr]     Checking mio v1.1.1
[INFO] [stderr]    Compiling rustix v1.1.4
[INFO] [stderr]     Checking value-bag v1.12.0
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking event-listener v5.4.1
[INFO] [stderr]    Compiling bumpalo v3.20.2
[INFO] [stderr]    Compiling wasm-bindgen v0.2.114
[INFO] [stderr]     Checking piper v0.2.5
[INFO] [stderr]     Checking signal-hook-registry v1.4.8
[INFO] [stderr]    Compiling plat v0.8.0
[INFO] [stderr]     Checking tracing v0.1.44
[INFO] [stderr]     Checking async-executor v1.14.0
[INFO] [stderr]     Checking parking_lot v0.12.5
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking event-listener-strategy v0.5.4
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling cc v1.2.56
[INFO] [stderr]    Compiling serde_json v1.0.149
[INFO] [stderr]     Checking log v0.4.29
[INFO] [stderr]     Checking pollster v0.4.0
[INFO] [stderr]     Checking sdd v3.0.10
[INFO] [stderr]    Compiling hreads v0.13.0
[INFO] [stderr]     Checking wasm-bindgen-test-shared v0.2.114
[INFO] [stderr]     Checking nu-ansi-term v0.50.3
[INFO] [stderr]     Checking async-channel v2.5.0
[INFO] [stderr]     Checking async-lock v3.4.2
[INFO] [stderr]     Checking scc v2.4.0
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking blocking v1.6.2
[INFO] [stderr]     Checking http-body v1.0.1
[INFO] [stderr]     Checking http-body-util v0.1.3
[INFO] [stderr]    Compiling cmake v0.1.57
[INFO] [stderr]    Compiling aws-lc-sys v0.37.1
[INFO] [stderr]     Checking polling v3.11.0
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.114
[INFO] [stderr]     Checking async-io v2.6.0
[INFO] [stderr]     Checking async-global-executor v2.4.1
[INFO] [stderr]     Checking async-std v1.13.2
[INFO] [stderr]    Compiling zerofrom-derive v0.1.6
[INFO] [stderr]    Compiling yoke-derive v0.8.1
[INFO] [stderr]    Compiling futures-macro v0.3.32
[INFO] [stderr]    Compiling zerovec-derive v0.11.2
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling tokio-macros v2.6.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling serial_test_derive v3.4.0
[INFO] [stderr]    Compiling async-trait v0.1.89
[INFO] [stderr]     Checking futures-util v0.3.32
[INFO] [stderr]    Compiling wasm-bindgen-test-macro v0.3.64
[INFO] [stderr]     Checking tokio v1.49.0
[INFO] [stderr]     Checking zerofrom v0.1.6
[INFO] [stderr]     Checking yoke v0.8.1
[INFO] [stderr]     Checking zerotrie v0.2.3
[INFO] [stderr]     Checking zerovec v0.11.5
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.114
[INFO] [stderr]     Checking tinystr v0.8.2
[INFO] [stderr]     Checking potential_utf v0.1.4
[INFO] [stderr]     Checking icu_locale_core v2.1.1
[INFO] [stderr]     Checking icu_collections v2.1.1
[INFO] [stderr]     Checking futures-executor v0.3.32
[INFO] [stderr]     Checking futures v0.3.32
[INFO] [stderr]     Checking serial_test v3.4.0
[INFO] [stderr]     Checking icu_provider v2.1.1
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking icu_properties v2.1.2
[INFO] [stderr]     Checking icu_normalizer v2.1.1
[INFO] [stderr]     Checking js-sys v0.3.91
[INFO] [stderr]     Checking idna_adapter v1.2.1
[INFO] [stderr]     Checking idna v1.1.0
[INFO] [stderr]     Checking url v2.5.8
[INFO] [stderr]    Compiling rustls v0.23.37
[INFO] [stderr]     Checking hyper v1.8.1
[INFO] [stderr]     Checking tower v0.5.3
[INFO] [stderr]     Checking tower-http v0.6.8
[INFO] [stderr]     Checking hyper-util v0.1.20
[INFO] [stderr]     Checking rustls-webpki v0.103.9
[INFO] [stderr]     Checking tokio-rustls v0.26.4
[INFO] [stderr]     Checking rustls-platform-verifier v0.6.2
[INFO] [stderr]     Checking wasm-bindgen-futures v0.4.64
[INFO] [stderr]     Checking hyper-rustls v0.27.7
[INFO] [stderr]     Checking wasm-bindgen-test v0.3.64
[INFO] [stderr]     Checking reqwest v0.13.2
[INFO] [stderr]     Checking refs v0.51.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `refs` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `refs` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "d0c934f609428804a76459bef0ad1a85bcb8bcdb6bf65d41479a516006b7be4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0c934f609428804a76459bef0ad1a85bcb8bcdb6bf65d41479a516006b7be4c", kill_on_drop: false }`
[INFO] [stdout] d0c934f609428804a76459bef0ad1a85bcb8bcdb6bf65d41479a516006b7be4c
