[INFO] fetching crate kvc 1.1.3...
[INFO] checking kvc-1.1.3 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate kvc 1.1.3 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate kvc 1.1.3 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 kvc 1.1.3
[INFO] finished tweaking crates.io crate kvc 1.1.3
[INFO] tweaked toml for crates.io crate kvc 1.1.3 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate kvc 1.1.3 already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 73c0e65661190f297c2cccf18141323c7518c1cf2d342ef133d379be480dd8b5
[INFO] running `Command { std: "docker" "start" "-a" "73c0e65661190f297c2cccf18141323c7518c1cf2d342ef133d379be480dd8b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "73c0e65661190f297c2cccf18141323c7518c1cf2d342ef133d379be480dd8b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73c0e65661190f297c2cccf18141323c7518c1cf2d342ef133d379be480dd8b5", kill_on_drop: false }`
[INFO] [stdout] 73c0e65661190f297c2cccf18141323c7518c1cf2d342ef133d379be480dd8b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] f2c76069620c264bcb2c40be2cfee59b6a8d25798647b8acc2684909e31cfc72
[INFO] running `Command { std: "docker" "start" "-a" "f2c76069620c264bcb2c40be2cfee59b6a8d25798647b8acc2684909e31cfc72", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.146
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking regex v1.8.4
[INFO] [stderr]     Checking kvc v1.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.85s
[INFO] running `Command { std: "docker" "inspect" "f2c76069620c264bcb2c40be2cfee59b6a8d25798647b8acc2684909e31cfc72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2c76069620c264bcb2c40be2cfee59b6a8d25798647b8acc2684909e31cfc72", kill_on_drop: false }`
[INFO] [stdout] f2c76069620c264bcb2c40be2cfee59b6a8d25798647b8acc2684909e31cfc72
[INFO] checking kvc-1.1.3 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate kvc 1.1.3 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate kvc 1.1.3 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 kvc 1.1.3
[INFO] finished tweaking crates.io crate kvc 1.1.3
[INFO] tweaked toml for crates.io crate kvc 1.1.3 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate kvc 1.1.3 already has a lockfile, it will not be regenerated
[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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 6a7e2ac1571f82f910210c5c619d0bbe5bff09dfa5d5cb6420d00d2b09bf9c4c
[INFO] running `Command { std: "docker" "start" "-a" "6a7e2ac1571f82f910210c5c619d0bbe5bff09dfa5d5cb6420d00d2b09bf9c4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a7e2ac1571f82f910210c5c619d0bbe5bff09dfa5d5cb6420d00d2b09bf9c4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a7e2ac1571f82f910210c5c619d0bbe5bff09dfa5d5cb6420d00d2b09bf9c4c", kill_on_drop: false }`
[INFO] [stdout] 6a7e2ac1571f82f910210c5c619d0bbe5bff09dfa5d5cb6420d00d2b09bf9c4c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 80cdb19ebd1c731b9b6d73578fe03a9e2b3a1db2bd8bd922584ea5d2d6c0d93a
[INFO] running `Command { std: "docker" "start" "-a" "80cdb19ebd1c731b9b6d73578fe03a9e2b3a1db2bd8bd922584ea5d2d6c0d93a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.146
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking aho-corasick v1.0.2
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking regex v1.8.4
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.8.4/src/exec.rs:899:13
[INFO] [stdout]     |
[INFO] [stdout] 899 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 900 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 901 | |                 self.cache.value(),
[INFO] [stdout] 902 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 913 | |                 Quit => return Some(Quit),
[INFO] [stdout] 914 | |             };
[INFO] [stdout]     | |_____________^ cannot infer type
[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 `regex` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "80cdb19ebd1c731b9b6d73578fe03a9e2b3a1db2bd8bd922584ea5d2d6c0d93a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80cdb19ebd1c731b9b6d73578fe03a9e2b3a1db2bd8bd922584ea5d2d6c0d93a", kill_on_drop: false }`
[INFO] [stdout] 80cdb19ebd1c731b9b6d73578fe03a9e2b3a1db2bd8bd922584ea5d2d6c0d93a