[INFO] fetching crate mon-artist 0.1.3...
[INFO] checking mon-artist-0.1.3 against try#9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c for pr-79472
[INFO] extracting crate mon-artist 0.1.3 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate mon-artist 0.1.3 on toolchain 9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "read-manifest" "--manifest-path" "Cargo.toml", 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-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lalrpop-util v0.13.1
[INFO] [stderr]   Downloaded lalrpop-intern v0.13.1
[INFO] [stderr]   Downloaded lalrpop-snap v0.13.1
[INFO] [stderr]   Downloaded treexml v0.3.0
[INFO] [stderr]   Downloaded ena v0.5.0
[INFO] [stderr]   Downloaded tango v0.6.2
[INFO] [stderr]   Downloaded lalrpop v0.13.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 45aed6ce653b44579c1bedcc4c7a478958516c25ce980808004faf78fec3ad1f
[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" "45aed6ce653b44579c1bedcc4c7a478958516c25ce980808004faf78fec3ad1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45aed6ce653b44579c1bedcc4c7a478958516c25ce980808004faf78fec3ad1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45aed6ce653b44579c1bedcc4c7a478958516c25ce980808004faf78fec3ad1f", kill_on_drop: false }`
[INFO] [stdout] 45aed6ce653b44579c1bedcc4c7a478958516c25ce980808004faf78fec3ad1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d584087489059bf886598fd877d2f75a6c29de5f831c8dec11c8925a422a962c
[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" "d584087489059bf886598fd877d2f75a6c29de5f831c8dec11c8925a422a962c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling bit-vec v0.4.4
[INFO] [stderr]    Compiling strsim v0.6.0
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling ordermap v0.3.5
[INFO] [stderr]    Compiling lalrpop-intern v0.13.1
[INFO] [stderr]    Compiling regex-syntax v0.4.2
[INFO] [stderr]    Compiling lalrpop-util v0.13.1
[INFO] [stderr]    Compiling diff v0.1.12
[INFO] [stderr]    Compiling ena v0.5.0
[INFO] [stderr]    Compiling matches v0.1.8
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling tango v0.6.2
[INFO] [stderr]     Checking ucd-util v0.1.8
[INFO] [stderr]     Checking utf8-ranges v1.0.4
[INFO] [stderr]     Checking bitflags v0.3.3
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling ascii-canvas v1.0.0
[INFO] [stderr]    Compiling tinyvec v1.1.0
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling itertools v0.5.10
[INFO] [stderr]    Compiling bit-set v0.4.0
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking xml-rs v0.2.2
[INFO] [stderr]    Compiling petgraph v0.4.13
[INFO] [stderr]    Compiling aho-corasick v0.6.10
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking treexml v0.3.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.16
[INFO] [stderr]    Compiling atty v0.1.2
[INFO] [stderr]    Compiling filetime v0.1.15
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling docopt v0.7.0
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling lalrpop-snap v0.13.1
[INFO] [stderr]     Checking env_logger v0.4.3
[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`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d584087489059bf886598fd877d2f75a6c29de5f831c8dec11c8925a422a962c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d584087489059bf886598fd877d2f75a6c29de5f831c8dec11c8925a422a962c", kill_on_drop: false }`
[INFO] [stdout] d584087489059bf886598fd877d2f75a6c29de5f831c8dec11c8925a422a962c