[INFO] fetching crate mon-artist 0.1.3...
[INFO] checking mon-artist-0.1.3 against 1.55.0 for beta-1.56-3
[INFO] extracting crate mon-artist 0.1.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate mon-artist 0.1.3 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 mon-artist 0.1.3
[INFO] finished tweaking crates.io crate mon-artist 0.1.3
[INFO] tweaked toml for crates.io crate mon-artist 0.1.3 written to /workspace/builds/worker-4/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] 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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 1b5a617419d7cd2557ea2790710b8e7178e8f0062a33af82f92444b425b3886b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1b5a617419d7cd2557ea2790710b8e7178e8f0062a33af82f92444b425b3886b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1b5a617419d7cd2557ea2790710b8e7178e8f0062a33af82f92444b425b3886b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b5a617419d7cd2557ea2790710b8e7178e8f0062a33af82f92444b425b3886b", kill_on_drop: false }`
[INFO] [stdout] 1b5a617419d7cd2557ea2790710b8e7178e8f0062a33af82f92444b425b3886b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cce99f48993f54351f73612dd563e91c47f36a4adfd4d960b86b932ba0001f48
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "cce99f48993f54351f73612dd563e91c47f36a4adfd4d960b86b932ba0001f48", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling strsim v0.6.0
[INFO] [stderr]    Compiling term v0.4.6
[INFO] [stderr]    Compiling bit-vec v0.4.4
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling ena v0.5.0
[INFO] [stderr]    Compiling regex-syntax v0.4.2
[INFO] [stderr]    Compiling lalrpop-util v0.13.1
[INFO] [stderr]    Compiling lalrpop-intern v0.13.1
[INFO] [stderr]    Compiling tango v0.6.2
[INFO] [stderr]    Compiling same-file v0.1.3
[INFO] [stderr]    Compiling itertools v0.5.10
[INFO] [stderr]     Checking xml-rs v0.2.2
[INFO] [stderr]    Compiling filetime v0.1.15
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling walkdir v1.0.7
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling bit-set v0.4.0
[INFO] [stderr]    Compiling ascii-canvas v1.0.0
[INFO] [stderr]    Compiling atty v0.1.2
[INFO] [stderr]     Checking treexml v0.3.0
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling docopt v0.7.0
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tango-0.6.2/src/lib.rs:259:57
[INFO] [stdout]     |
[INFO] [stdout] 259 |         for c in self.0.components().skip(1) { p.push(c.as_ref().to_str().expect("how else can I replace root?")); }
[INFO] [stdout]     |                                                       --^^^^^^--
[INFO] [stdout]     |                                                       | |
[INFO] [stdout]     |                                                       | cannot infer type for type parameter `T` declared on the trait `AsRef`
[INFO] [stdout]     |                                                       this method call resolves to `&T`
[INFO] [stdout]     |
[INFO] [stdout]     = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tango-0.6.2/src/lib.rs:273:57
[INFO] [stdout]     |
[INFO] [stdout] 273 |         for c in self.0.components().skip(1) { p.push(c.as_ref().to_str().expect("how else can I replace root?")); }
[INFO] [stdout]     |                                                       --^^^^^^--
[INFO] [stdout]     |                                                       | |
[INFO] [stdout]     |                                                       | cannot infer type for type parameter `T` declared on the trait `AsRef`
[INFO] [stdout]     |                                                       this method call resolves to `&T`
[INFO] [stdout]     |
[INFO] [stdout]     = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tango` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "cce99f48993f54351f73612dd563e91c47f36a4adfd4d960b86b932ba0001f48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cce99f48993f54351f73612dd563e91c47f36a4adfd4d960b86b932ba0001f48", kill_on_drop: false }`
[INFO] [stdout] cce99f48993f54351f73612dd563e91c47f36a4adfd4d960b86b932ba0001f48
