[INFO] cloning repository https://github.com/Arc-blroth/aisafety-connect4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Arc-blroth/aisafety-connect4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArc-blroth%2Faisafety-connect4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArc-blroth%2Faisafety-connect4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cd616f4ff0a8e49dc54a633a58ff77448aed24c1
[INFO] checking Arc-blroth/aisafety-connect4 against master#46424fb5054f211ec836c5c03159f92e46bb35ac for pr-139042
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArc-blroth%2Faisafety-connect4" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Arc-blroth/aisafety-connect4 on toolchain 46424fb5054f211ec836c5c03159f92e46bb35ac
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+46424fb5054f211ec836c5c03159f92e46bb35ac" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1-tc1/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-1-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/Arc-blroth/aisafety-connect4
[INFO] finished tweaking git repo https://github.com/Arc-blroth/aisafety-connect4
[INFO] tweaked toml for git repo https://github.com/Arc-blroth/aisafety-connect4 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Arc-blroth/aisafety-connect4 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" "+46424fb5054f211ec836c5c03159f92e46bb35ac" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tensorflow-sys v0.22.1
[INFO] [stderr]   Downloaded tensorflow-internal-macros v0.0.3
[INFO] [stderr]   Downloaded openssl-sys v0.9.77
[INFO] [stderr]   Downloaded filetime v0.2.18
[INFO] [stderr]   Downloaded curl v0.4.44
[INFO] [stderr]   Downloaded num-complex v0.4.2
[INFO] [stderr]   Downloaded tar v0.4.38
[INFO] [stderr]   Downloaded cc v1.0.74
[INFO] [stderr]   Downloaded xattr v0.2.3
[INFO] [stderr]   Downloaded protobuf v2.27.1
[INFO] [stderr]   Downloaded tensorflow v0.19.1
[INFO] [stderr]   Downloaded curl-sys v0.4.58+curl-7.86.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+46424fb5054f211ec836c5c03159f92e46bb35ac" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0fd1482bd7f4617911c7cb80dfca71f6ad9e15209be68a9bcb3f5fb7cce43ed9
[INFO] running `Command { std: "docker" "start" "-a" "0fd1482bd7f4617911c7cb80dfca71f6ad9e15209be68a9bcb3f5fb7cce43ed9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0fd1482bd7f4617911c7cb80dfca71f6ad9e15209be68a9bcb3f5fb7cce43ed9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fd1482bd7f4617911c7cb80dfca71f6ad9e15209be68a9bcb3f5fb7cce43ed9", kill_on_drop: false }`
[INFO] [stdout] 0fd1482bd7f4617911c7cb80dfca71f6ad9e15209be68a9bcb3f5fb7cce43ed9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+46424fb5054f211ec836c5c03159f92e46bb35ac" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6f0113b53063c0cf98edb4350c61f08c7a6f4904d757a896b80e56edb697dd2c
[INFO] running `Command { std: "docker" "start" "-a" "6f0113b53063c0cf98edb4350c61f08c7a6f4904d757a896b80e56edb697dd2c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling pkg-config v0.3.26
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling cpufeatures v0.2.5
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling zstd-safe v5.0.2+zstd.1.5.2
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling base64ct v1.5.3
[INFO] [stderr]    Compiling time-core v0.1.0
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling miniz_oxide v0.5.4
[INFO] [stderr]    Compiling time-macros v0.2.5
[INFO] [stderr]    Compiling itoa v1.0.4
[INFO] [stderr]    Compiling password-hash v0.4.2
[INFO] [stderr]    Compiling num_threads v0.1.6
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling semver v1.0.14
[INFO] [stderr]    Compiling curl v0.4.44
[INFO] [stderr]    Compiling constant_time_eq v0.1.5
[INFO] [stderr]    Compiling openssl-probe v0.1.5
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling flate2 v1.0.24
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[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-1949cf8c6b5b557f/proc-macro2-1.0.47/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 syn v1.0.103
[INFO] [stderr]    Compiling jobserver v0.1.25
[INFO] [stderr]    Compiling xattr v0.2.3
[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" "6f0113b53063c0cf98edb4350c61f08c7a6f4904d757a896b80e56edb697dd2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f0113b53063c0cf98edb4350c61f08c7a6f4904d757a896b80e56edb697dd2c", kill_on_drop: false }`
[INFO] [stdout] 6f0113b53063c0cf98edb4350c61f08c7a6f4904d757a896b80e56edb697dd2c
