[INFO] fetching crate traitgraph 0.2.0...
[INFO] testing traitgraph-0.2.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate traitgraph 0.2.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate traitgraph 0.2.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate traitgraph 0.2.0
[INFO] finished tweaking crates.io crate traitgraph 0.2.0
[INFO] tweaked toml for crates.io crate traitgraph 0.2.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fdb9662c6ba6e79acf1efbb86b239576fb6d25e70e344d39901be7b00aa2672c
[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" "fdb9662c6ba6e79acf1efbb86b239576fb6d25e70e344d39901be7b00aa2672c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdb9662c6ba6e79acf1efbb86b239576fb6d25e70e344d39901be7b00aa2672c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdb9662c6ba6e79acf1efbb86b239576fb6d25e70e344d39901be7b00aa2672c", kill_on_drop: false }`
[INFO] [stdout] fdb9662c6ba6e79acf1efbb86b239576fb6d25e70e344d39901be7b00aa2672c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 581f5e8a74c9a6a3530006151d30facaa0adb8a3aec031c85e1f9565f2145d37
[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" "581f5e8a74c9a6a3530006151d30facaa0adb8a3aec031c85e1f9565f2145d37", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitvector v0.1.5
[INFO] [stderr]    Compiling traitsequence v0.2.0
[INFO] [stderr]    Compiling traitgraph v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/algo/traversal/mod.rs:189:39
[INFO] [stdout]     |
[INFO] [stdout] 189 |                     if *rank_entry == None.into() {
[INFO] [stdout]     |                                       ^^^^ cannot infer type for type parameter `T` declared on the enum `Option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/algo/traversal/mod.rs:296:38
[INFO] [stdout]     |
[INFO] [stdout] 296 |             } else if *rank_entry == None.into() {
[INFO] [stdout]     |                                      ^^^^ cannot infer type for type parameter `T` declared on the enum `Option`
[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 `traitgraph`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "581f5e8a74c9a6a3530006151d30facaa0adb8a3aec031c85e1f9565f2145d37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "581f5e8a74c9a6a3530006151d30facaa0adb8a3aec031c85e1f9565f2145d37", kill_on_drop: false }`
[INFO] [stdout] 581f5e8a74c9a6a3530006151d30facaa0adb8a3aec031c85e1f9565f2145d37