[INFO] cloning repository https://github.com/ajuvercr/silviator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ajuvercr/silviator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fajuvercr%2Fsilviator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fajuvercr%2Fsilviator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3b890d6b8b28135264b5bbd9613244d76b749758
[INFO] checking ajuvercr/silviator/3b890d6b8b28135264b5bbd9613244d76b749758 against master#f8c27dfe1a2e7fb538fd91dad53de06992c7c967 for pr-138915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fajuvercr%2Fsilviator" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ajuvercr/silviator on toolchain f8c27dfe1a2e7fb538fd91dad53de06992c7c967
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f8c27dfe1a2e7fb538fd91dad53de06992c7c967" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/ajuvercr/silviator
[INFO] finished tweaking git repo https://github.com/ajuvercr/silviator
[INFO] tweaked toml for git repo https://github.com/ajuvercr/silviator written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ajuvercr/silviator 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" "+f8c27dfe1a2e7fb538fd91dad53de06992c7c967" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rs-graph v0.20.1
[INFO] [stderr]   Downloaded vecs v0.2.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+f8c27dfe1a2e7fb538fd91dad53de06992c7c967" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4508729a8f43b2d7325f5808f57cca0b44100eaeafe492e115679b9e6ccaaf33
[INFO] running `Command { std: "docker" "start" "-a" "4508729a8f43b2d7325f5808f57cca0b44100eaeafe492e115679b9e6ccaaf33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4508729a8f43b2d7325f5808f57cca0b44100eaeafe492e115679b9e6ccaaf33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4508729a8f43b2d7325f5808f57cca0b44100eaeafe492e115679b9e6ccaaf33", kill_on_drop: false }`
[INFO] [stdout] 4508729a8f43b2d7325f5808f57cca0b44100eaeafe492e115679b9e6ccaaf33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+f8c27dfe1a2e7fb538fd91dad53de06992c7c967" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f2e0e341a44983b24e212c5a7ddd3aa510e2d35d12c166b613c6bde19fb26c5
[INFO] running `Command { std: "docker" "start" "-a" "3f2e0e341a44983b24e212c5a7ddd3aa510e2d35d12c166b613c6bde19fb26c5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.47
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.103
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling serde_derive v1.0.147
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling serde v1.0.147
[INFO] [stderr]    Compiling serde_json v1.0.89
[INFO] [stderr]     Checking itoa v1.0.4
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking either v1.8.0
[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] [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" "3f2e0e341a44983b24e212c5a7ddd3aa510e2d35d12c166b613c6bde19fb26c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f2e0e341a44983b24e212c5a7ddd3aa510e2d35d12c166b613c6bde19fb26c5", kill_on_drop: false }`
[INFO] [stdout] 3f2e0e341a44983b24e212c5a7ddd3aa510e2d35d12c166b613c6bde19fb26c5