[INFO] fetching crate blockchain-cycle-finder 0.1.0...
[INFO] checking blockchain-cycle-finder-0.1.0 against master#c2f2db79ca3024f68d22b45aa22b570775c2c4ad for pr-124157
[INFO] extracting crate blockchain-cycle-finder 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate blockchain-cycle-finder 0.1.0 on toolchain c2f2db79ca3024f68d22b45aa22b570775c2c4ad
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate blockchain-cycle-finder 0.1.0
[INFO] finished tweaking crates.io crate blockchain-cycle-finder 0.1.0
[INFO] tweaked toml for crates.io crate blockchain-cycle-finder 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate blockchain-cycle-finder 0.1.0 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" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded db-key v0.0.5
[INFO] [stderr]   Downloaded ffi-opaque v2.0.1
[INFO] [stderr]   Downloaded array_tool v1.0.3
[INFO] [stderr]   Downloaded cmake v0.1.48
[INFO] [stderr]   Downloaded par-iter-sync v0.1.10
[INFO] [stderr]   Downloaded bech32 v0.8.1
[INFO] [stderr]   Downloaded leveldb v0.8.6
[INFO] [stderr]   Downloaded bitcoin-explorer v1.2.17
[INFO] [stderr]   Downloaded bitcoin_hashes v0.10.0
[INFO] [stderr]   Downloaded rocksdb v0.19.0
[INFO] [stderr]   Downloaded bitcoin v0.27.1
[INFO] [stderr]   Downloaded libc v0.2.134
[INFO] [stderr]   Downloaded syn v1.0.101
[INFO] [stderr]   Downloaded zstd-sys v2.0.1+zstd.1.5.2
[INFO] [stderr]   Downloaded serde_json v1.0.86
[INFO] [stderr]   Downloaded leveldb-sys v2.0.9
[INFO] [stderr]   Downloaded crossbeam-epoch v0.9.11
[INFO] [stderr]   Downloaded clang-sys v1.4.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.46
[INFO] [stderr]   Downloaded serde v1.0.145
[INFO] [stderr]   Downloaded crossbeam-queue v0.3.6
[INFO] [stderr]   Downloaded serde_derive v1.0.145
[INFO] [stderr]   Downloaded librocksdb-sys v0.8.0+7.4.4
[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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1a37406c20657069caeacf0253c19f1d397aa269a78ad2f856f11d96cc299dc
[INFO] running `Command { std: "docker" "start" "-a" "c1a37406c20657069caeacf0253c19f1d397aa269a78ad2f856f11d96cc299dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1a37406c20657069caeacf0253c19f1d397aa269a78ad2f856f11d96cc299dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1a37406c20657069caeacf0253c19f1d397aa269a78ad2f856f11d96cc299dc", kill_on_drop: false }`
[INFO] [stdout] c1a37406c20657069caeacf0253c19f1d397aa269a78ad2f856f11d96cc299dc
[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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa0925dd339edd167636372164376c09e57b6dce50cf7820c47a33e2384a264b
[INFO] running `Command { std: "docker" "start" "-a" "fa0925dd339edd167636372164376c09e57b6dce50cf7820c47a33e2384a264b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.134
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling unicode-ident v1.0.4
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling serde_derive v1.0.145
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.11
[INFO] [stderr]    Compiling libloading v0.7.3
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling bindgen v0.60.1
[INFO] [stderr]    Compiling regex-syntax v0.6.27
[INFO] [stderr]    Compiling crossbeam-queue v0.3.6
[INFO] [stderr]    Compiling shlex v1.1.0
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]    Compiling serde_json v1.0.86
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]    Compiling indexmap v1.9.1
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling clang-sys v1.4.0
[INFO] [stderr]     Checking itoa v1.0.4
[INFO] [stderr]     Checking ffi-opaque v2.0.1
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.46/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 heck v0.4.0
[INFO] [stderr]     Checking os_str_bytes v6.3.0
[INFO] [stderr]     Checking db-key v0.0.5
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking bech32 v0.8.1
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling nom v7.1.1
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "fa0925dd339edd167636372164376c09e57b6dce50cf7820c47a33e2384a264b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa0925dd339edd167636372164376c09e57b6dce50cf7820c47a33e2384a264b", kill_on_drop: false }`
[INFO] [stdout] fa0925dd339edd167636372164376c09e57b6dce50cf7820c47a33e2384a264b
