[INFO] fetching crate futures_ringbuf 0.4.0...
[INFO] testing futures_ringbuf-0.4.0 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145330-1
[INFO] extracting crate futures_ringbuf 0.4.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate futures_ringbuf 0.4.0
[INFO] finished tweaking crates.io crate futures_ringbuf 0.4.0
[INFO] tweaked toml for crates.io crate futures_ringbuf 0.4.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate futures_ringbuf 0.4.0 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate futures_ringbuf 0.4.0 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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded async-channel v1.8.0
[INFO] [stderr]   Downloaded futures-channel v0.3.28
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.86
[INFO] [stderr]   Downloaded unicode-ident v1.0.9
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.86
[INFO] [stderr]   Downloaded windows_i686_gnu v0.48.0
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.36
[INFO] [stderr]   Downloaded assert_matches v1.5.0
[INFO] [stderr]   Downloaded async-executor v1.5.1
[INFO] [stderr]   Downloaded async-task v4.4.0
[INFO] [stderr]   Downloaded atomic-waker v1.1.1
[INFO] [stderr]   Downloaded socket2 v0.4.9
[INFO] [stderr]   Downloaded ctor v0.1.26
[INFO] [stderr]   Downloaded pin-project v1.1.0
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.86
[INFO] [stderr]   Downloaded ringbuf v0.3.3
[INFO] [stderr]   Downloaded pin-project-internal v1.1.0
[INFO] [stderr]   Downloaded tracing v0.1.37
[INFO] [stderr]   Downloaded futures v0.3.28
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[INFO] [stderr]   Downloaded windows_x86_64_msvc v0.48.0
[INFO] [stderr]   Downloaded pretty_assertions v1.3.0
[INFO] [stderr]   Downloaded windows_aarch64_msvc v0.48.0
[INFO] [stderr]   Downloaded windows_i686_msvc v0.48.0
[INFO] [stderr]   Downloaded windows_x86_64_gnu v0.48.0
[INFO] [stderr]   Downloaded tokio v1.28.2
[INFO] [stderr]   Downloaded once_cell v1.18.0
[INFO] [stderr]   Downloaded rustix v0.37.19
[INFO] [stderr]   Downloaded semver v1.0.17
[INFO] [stderr]   Downloaded bumpalo v3.13.0
[INFO] [stderr]   Downloaded value-bag v1.4.0
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.86
[INFO] [stderr]   Downloaded syn v2.0.18
[INFO] [stderr]   Downloaded futures-core v0.3.28
[INFO] [stderr]   Downloaded futures-io v0.3.28
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[INFO] [stderr]   Downloaded futures-util v0.3.28
[INFO] [stderr]   Downloaded bytes v1.4.0
[INFO] [stderr]   Downloaded tokio-util v0.7.8
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[INFO] [stderr]   Downloaded log v0.4.18
[INFO] [stderr]   Downloaded blocking v1.3.1
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[INFO] [stderr]   Downloaded output_vt100 v0.1.3
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[INFO] [stderr]   Downloaded async-global-executor v2.3.1
[INFO] [stderr]   Downloaded cc v1.0.79
[INFO] [stderr]   Downloaded hermit-abi v0.3.1
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[INFO] [stderr]   Downloaded instant v0.1.12
[INFO] [stderr]   Downloaded parking v2.1.0
[INFO] [stderr]   Downloaded futures-macro v0.3.28
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[INFO] [stderr]   Downloaded web-sys v0.3.63
[INFO] [stderr]   Downloaded proc-macro2 v1.0.59
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 22280137356eea5532b065cacb1029d71d43e23bcffe29cf785b8614fa7a3011
[INFO] running `Command { std: "docker" "start" "-a" "22280137356eea5532b065cacb1029d71d43e23bcffe29cf785b8614fa7a3011", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "22280137356eea5532b065cacb1029d71d43e23bcffe29cf785b8614fa7a3011", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22280137356eea5532b065cacb1029d71d43e23bcffe29cf785b8614fa7a3011", kill_on_drop: false }`
[INFO] [stdout] 22280137356eea5532b065cacb1029d71d43e23bcffe29cf785b8614fa7a3011
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e503ae22debc2f3a15396b2b60fa7966781b0abdb2f25333f9d1ad54822636d
[INFO] running `Command { std: "docker" "start" "-a" "1e503ae22debc2f3a15396b2b60fa7966781b0abdb2f25333f9d1ad54822636d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.59
[INFO] [stderr]    Compiling quote v1.0.28
[INFO] [stderr]    Compiling unicode-ident v1.0.9
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-sink v0.3.28
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling futures-io v0.3.28
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling log v0.4.18
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.59/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling ringbuf v0.3.3
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1e503ae22debc2f3a15396b2b60fa7966781b0abdb2f25333f9d1ad54822636d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e503ae22debc2f3a15396b2b60fa7966781b0abdb2f25333f9d1ad54822636d", kill_on_drop: false }`
[INFO] [stdout] 1e503ae22debc2f3a15396b2b60fa7966781b0abdb2f25333f9d1ad54822636d