[INFO] fetching crate exonum_flamer 0.1.6...
[INFO] testing exonum_flamer-0.1.6 against 1.55.0 for beta-1.56-1
[INFO] extracting crate exonum_flamer 0.1.6 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate exonum_flamer 0.1.6 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exonum_flamer 0.1.6
[INFO] finished tweaking crates.io crate exonum_flamer 0.1.6
[INFO] tweaked toml for crates.io crate exonum_flamer 0.1.6 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 59a6be87b64c4b895c912e56eab5823ae9795541290e60c32d33224631b13231
[INFO] running `Command { std: "docker" "start" "-a" "59a6be87b64c4b895c912e56eab5823ae9795541290e60c32d33224631b13231", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "59a6be87b64c4b895c912e56eab5823ae9795541290e60c32d33224631b13231", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59a6be87b64c4b895c912e56eab5823ae9795541290e60c32d33224631b13231", kill_on_drop: false }`
[INFO] [stdout] 59a6be87b64c4b895c912e56eab5823ae9795541290e60c32d33224631b13231
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c7dc7dc754902d9ff1d9b9f26b24da81b18a9badc0d3d580dd5021be995b25d2
[INFO] running `Command { std: "docker" "start" "-a" "c7dc7dc754902d9ff1d9b9f26b24da81b18a9badc0d3d580dd5021be995b25d2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling exonum_flamer v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:2:30
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(plugin_registrar, quote, rustc_private, custom_attribute)]
[INFO] [stdout]   |                              ^^^^^ feature has been removed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:2:52
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(plugin_registrar, quote, rustc_private, custom_attribute)]
[INFO] [stdout]   |                                                    ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `rustc_plugin`
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate rustc_plugin;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0463, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exonum_flamer` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "c7dc7dc754902d9ff1d9b9f26b24da81b18a9badc0d3d580dd5021be995b25d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7dc7dc754902d9ff1d9b9f26b24da81b18a9badc0d3d580dd5021be995b25d2", kill_on_drop: false }`
[INFO] [stdout] c7dc7dc754902d9ff1d9b9f26b24da81b18a9badc0d3d580dd5021be995b25d2