[INFO] fetching crate graph-similarity-cmd 0.0.1...
[INFO] checking graph-similarity-cmd-0.0.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate graph-similarity-cmd 0.0.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate graph-similarity-cmd 0.0.1 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate graph-similarity-cmd 0.0.1
[INFO] finished tweaking crates.io crate graph-similarity-cmd 0.0.1
[INFO] tweaked toml for crates.io crate graph-similarity-cmd 0.0.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 28 packages
[INFO] [stderr]       Adding closed01 v0.4.0 (latest: v0.5.0)
[INFO] [stderr]       Adding fixedbitset v0.1.9 (latest: v0.5.6)
[INFO] [stderr]       Adding graph-io-gml v0.1.1 (latest: v0.3.0)
[INFO] [stderr]       Adding graph-neighbor-matching v0.6.2 (latest: v0.9.0)
[INFO] [stderr]       Adding munkres v0.3.0 (latest: v0.5.2)
[INFO] [stderr]       Adding nalgebra v0.5.1 (latest: v0.32.5)
[INFO] [stderr]       Adding num v0.1.42 (latest: v0.4.1)
[INFO] [stderr]       Adding num-bigint v0.1.44 (latest: v0.4.4)
[INFO] [stderr]       Adding num-complex v0.1.43 (latest: v0.4.5)
[INFO] [stderr]       Adding num-rational v0.1.42 (latest: v0.4.1)
[INFO] [stderr]       Adding petgraph v0.2.10 (latest: v0.6.4)
[INFO] [stderr]       Adding rand v0.3.23 (latest: v0.8.5)
[INFO] [stderr]       Adding rand v0.4.6 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_core v0.3.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_core v0.4.2 (latest: v0.6.4)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded closed01 v0.4.0
[INFO] [stderr]   Downloaded asexp v0.3.2
[INFO] [stderr]   Downloaded graph-neighbor-matching v0.6.2
[INFO] [stderr]   Downloaded graph-io-gml v0.1.1
[INFO] [stderr]   Downloaded nalgebra v0.5.1
[INFO] [stderr]   Downloaded munkres v0.3.0
[INFO] [stderr]   Downloaded petgraph v0.2.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 06a6c52a0858ebb99abff634d8e55f682b5a397c5e5f708025debf54268dc7f3
[INFO] running `Command { std: "docker" "start" "-a" "06a6c52a0858ebb99abff634d8e55f682b5a397c5e5f708025debf54268dc7f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "06a6c52a0858ebb99abff634d8e55f682b5a397c5e5f708025debf54268dc7f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06a6c52a0858ebb99abff634d8e55f682b5a397c5e5f708025debf54268dc7f3", kill_on_drop: false }`
[INFO] [stdout] 06a6c52a0858ebb99abff634d8e55f682b5a397c5e5f708025debf54268dc7f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a172fe3d7a5b775803cb19ab2791f1a6fba5665dd8ca4a95ddab258251057ff7
[INFO] running `Command { std: "docker" "start" "-a" "a172fe3d7a5b775803cb19ab2791f1a6fba5665dd8ca4a95ddab258251057ff7", kill_on_drop: false }`
[INFO] [stderr]     Checking rustc-serialize v0.3.25
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking asexp v0.3.2
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking petgraph v0.2.10
[INFO] [stderr]     Checking munkres v0.3.0
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking graph-io-gml v0.1.1
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking nalgebra v0.5.1
[INFO] [stderr]     Checking closed01 v0.4.0
[INFO] [stderr]     Checking graph-neighbor-matching v0.6.2
[INFO] [stderr]     Checking graph-similarity-cmd v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.15s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: munkres v0.3.0, nalgebra v0.5.1, num-bigint v0.1.44, num-complex v0.1.43, num-rational v0.1.42
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "a172fe3d7a5b775803cb19ab2791f1a6fba5665dd8ca4a95ddab258251057ff7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a172fe3d7a5b775803cb19ab2791f1a6fba5665dd8ca4a95ddab258251057ff7", kill_on_drop: false }`
[INFO] [stdout] a172fe3d7a5b775803cb19ab2791f1a6fba5665dd8ca4a95ddab258251057ff7
[INFO] checking graph-similarity-cmd-0.0.1 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate graph-similarity-cmd 0.0.1 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate graph-similarity-cmd 0.0.1 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate graph-similarity-cmd 0.0.1
[INFO] finished tweaking crates.io crate graph-similarity-cmd 0.0.1
[INFO] tweaked toml for crates.io crate graph-similarity-cmd 0.0.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] df006baebe68c0b25e4b96c45c49d6b42eb82a9139d1a4511845b3fbd20b6167
[INFO] running `Command { std: "docker" "start" "-a" "df006baebe68c0b25e4b96c45c49d6b42eb82a9139d1a4511845b3fbd20b6167", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df006baebe68c0b25e4b96c45c49d6b42eb82a9139d1a4511845b3fbd20b6167", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df006baebe68c0b25e4b96c45c49d6b42eb82a9139d1a4511845b3fbd20b6167", kill_on_drop: false }`
[INFO] [stdout] df006baebe68c0b25e4b96c45c49d6b42eb82a9139d1a4511845b3fbd20b6167
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89ef7982aab73ab60a9cab384785f802a92fef033a85edb2b5c01b4153225123
[INFO] running `Command { std: "docker" "start" "-a" "89ef7982aab73ab60a9cab384785f802a92fef033a85edb2b5c01b4153225123", kill_on_drop: false }`
[INFO] [stderr]     Checking rustc-serialize v0.3.25
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking asexp v0.3.2
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking petgraph v0.2.10
[INFO] [stderr]     Checking munkres v0.3.0
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]     Checking graph-io-gml v0.1.1
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rustc-serialize-0.3.25/src/json.rs:1387:20
[INFO] [stdout]      |
[INFO] [stdout] 1387 |             _ => { panic!(); }
[INFO] [stdout]      |                    ^^^^^^^^ cannot infer type
[INFO] [stdout]      |
[INFO] [stdout]      = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-serialize` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "89ef7982aab73ab60a9cab384785f802a92fef033a85edb2b5c01b4153225123", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89ef7982aab73ab60a9cab384785f802a92fef033a85edb2b5c01b4153225123", kill_on_drop: false }`
[INFO] [stdout] 89ef7982aab73ab60a9cab384785f802a92fef033a85edb2b5c01b4153225123