[INFO] fetching crate gw 0.2.0...
[INFO] checking gw-0.2.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate gw 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate gw 0.2.0 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 gw 0.2.0
[INFO] finished tweaking crates.io crate gw 0.2.0
[INFO] tweaked toml for crates.io crate gw 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate gw 0.2.0 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded normalize-line-endings v0.2.2
[INFO] [stderr]   Downloaded predicates-core v1.0.0
[INFO] [stderr]   Downloaded predicates-tree v1.0.0
[INFO] [stderr]   Downloaded float-cmp v0.5.3
[INFO] [stderr]   Downloaded escargot v0.3.1
[INFO] [stderr]   Downloaded predicates v1.0.2
[INFO] [stderr]   Downloaded serde_json v1.0.48
[INFO] [stderr]   Downloaded aho-corasick v0.7.8
[INFO] [stderr]   Downloaded regex v1.3.4
[INFO] [stderr]   Downloaded syn v1.0.15
[INFO] [stderr]   Downloaded treeline v0.1.0
[INFO] [stderr]   Downloaded assert_cmd v0.10.2
[INFO] [stderr]   Downloaded regex-syntax v0.6.14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] bb6dddf45054252a1a74b7102a5fadb647ddc27f8be57ba7b51741630e20cff4
[INFO] running `Command { std: "docker" "start" "-a" "bb6dddf45054252a1a74b7102a5fadb647ddc27f8be57ba7b51741630e20cff4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb6dddf45054252a1a74b7102a5fadb647ddc27f8be57ba7b51741630e20cff4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb6dddf45054252a1a74b7102a5fadb647ddc27f8be57ba7b51741630e20cff4", kill_on_drop: false }`
[INFO] [stdout] bb6dddf45054252a1a74b7102a5fadb647ddc27f8be57ba7b51741630e20cff4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 5aa7fcd7557d4110cedf6d98cb695336b03753cadea11bb1d2fbea2df0282e65
[INFO] running `Command { std: "docker" "start" "-a" "5aa7fcd7557d4110cedf6d98cb695336b03753cadea11bb1d2fbea2df0282e65", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.15
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]    Compiling escargot v0.3.1
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.14
[INFO] [stderr]     Checking normalize-line-endings v0.2.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking gw v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]     Checking aho-corasick v0.7.8
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking float-cmp v0.5.3
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]     Checking predicates v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking assert_cmd v0.10.2
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.87s
[INFO] running `Command { std: "docker" "inspect" "5aa7fcd7557d4110cedf6d98cb695336b03753cadea11bb1d2fbea2df0282e65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5aa7fcd7557d4110cedf6d98cb695336b03753cadea11bb1d2fbea2df0282e65", kill_on_drop: false }`
[INFO] [stdout] 5aa7fcd7557d4110cedf6d98cb695336b03753cadea11bb1d2fbea2df0282e65
[INFO] checking gw-0.2.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate gw 0.2.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate gw 0.2.0 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 gw 0.2.0
[INFO] finished tweaking crates.io crate gw 0.2.0
[INFO] tweaked toml for crates.io crate gw 0.2.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate gw 0.2.0 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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 4ac16f12c41862dbba010379cc93997ff1eff15a4a54e02d8e5839cdc564f7e3
[INFO] running `Command { std: "docker" "start" "-a" "4ac16f12c41862dbba010379cc93997ff1eff15a4a54e02d8e5839cdc564f7e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ac16f12c41862dbba010379cc93997ff1eff15a4a54e02d8e5839cdc564f7e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ac16f12c41862dbba010379cc93997ff1eff15a4a54e02d8e5839cdc564f7e3", kill_on_drop: false }`
[INFO] [stdout] 4ac16f12c41862dbba010379cc93997ff1eff15a4a54e02d8e5839cdc564f7e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 3a41a9be49ac81f4dc569ca12e45a97b2b3a74e32727c59b1c7693dae791e48d
[INFO] running `Command { std: "docker" "start" "-a" "3a41a9be49ac81f4dc569ca12e45a97b2b3a74e32727c59b1c7693dae791e48d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.15
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]    Compiling escargot v0.3.1
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking regex-syntax v0.6.14
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]     Checking normalize-line-endings v0.2.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking gw v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]     Checking aho-corasick v0.7.8
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking float-cmp v0.5.3
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.3.4/src/exec.rs:836:13
[INFO] [stdout]     |
[INFO] [stdout] 836 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 837 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 838 | |                 self.cache.value(),
[INFO] [stdout] 839 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 850 | |                 Quit => return Some(Quit),
[INFO] [stdout] 851 | |             };
[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] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "3a41a9be49ac81f4dc569ca12e45a97b2b3a74e32727c59b1c7693dae791e48d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a41a9be49ac81f4dc569ca12e45a97b2b3a74e32727c59b1c7693dae791e48d", kill_on_drop: false }`
[INFO] [stdout] 3a41a9be49ac81f4dc569ca12e45a97b2b3a74e32727c59b1c7693dae791e48d