[INFO] fetching crate sealed_test 1.0.0...
[INFO] checking sealed_test-1.0.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate sealed_test 1.0.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate sealed_test 1.0.0 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 sealed_test 1.0.0
[INFO] finished tweaking crates.io crate sealed_test 1.0.0
[INFO] tweaked toml for crates.io crate sealed_test 1.0.0 written to /workspace/builds/worker-5-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 52 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding env_logger v0.10.2 (latest: v0.11.3)
[INFO] [stderr]       Adding linux-raw-sys v0.4.13 (latest: v0.6.4)
[INFO] [stderr]       Adding quick-error v1.2.3 (latest: v2.0.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[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 rusty-forkfork v0.4.0
[INFO] [stderr]   Downloaded sealed_test_derive v1.0.0
[INFO] [stderr]   Downloaded cmd_lib v1.9.3
[INFO] [stderr]   Downloaded cmd_lib_macros v1.9.3
[INFO] [stderr]   Downloaded faccess v0.2.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] c37b0f7005bc1f36d8ad1401eb5c65fe556051c4275cabf36b26ab9ca0a68c64
[INFO] running `Command { std: "docker" "start" "-a" "c37b0f7005bc1f36d8ad1401eb5c65fe556051c4275cabf36b26ab9ca0a68c64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c37b0f7005bc1f36d8ad1401eb5c65fe556051c4275cabf36b26ab9ca0a68c64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c37b0f7005bc1f36d8ad1401eb5c65fe556051c4275cabf36b26ab9ca0a68c64", kill_on_drop: false }`
[INFO] [stdout] c37b0f7005bc1f36d8ad1401eb5c65fe556051c4275cabf36b26ab9ca0a68c64
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 8c03dc990eb115853f40df036dcc11f7aba76be3d2f59a2f8a857fefeeca7ec5
[INFO] running `Command { std: "docker" "start" "-a" "8c03dc990eb115853f40df036dcc11f7aba76be3d2f59a2f8a857fefeeca7ec5", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking is-terminal v0.4.12
[INFO] [stderr]     Checking faccess v0.2.4
[INFO] [stderr]     Checking os_pipe v1.1.5
[INFO] [stderr]     Checking fs_extra v1.3.0
[INFO] [stderr]     Checking env_logger v0.10.2
[INFO] [stderr]     Checking rusty-forkfork v0.4.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling cmd_lib_macros v1.9.3
[INFO] [stderr]    Compiling sealed_test_derive v1.0.0
[INFO] [stderr]     Checking sealed_test v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking cmd_lib v1.9.3
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.95s
[INFO] running `Command { std: "docker" "inspect" "8c03dc990eb115853f40df036dcc11f7aba76be3d2f59a2f8a857fefeeca7ec5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c03dc990eb115853f40df036dcc11f7aba76be3d2f59a2f8a857fefeeca7ec5", kill_on_drop: false }`
[INFO] [stdout] 8c03dc990eb115853f40df036dcc11f7aba76be3d2f59a2f8a857fefeeca7ec5
[INFO] checking sealed_test-1.0.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate sealed_test 1.0.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate sealed_test 1.0.0 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 sealed_test 1.0.0
[INFO] finished tweaking crates.io crate sealed_test 1.0.0
[INFO] tweaked toml for crates.io crate sealed_test 1.0.0 written to /workspace/builds/worker-5-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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 9b26ae9fdbb39362cab080677d30782a05ee03845a0a2dc1e15114ce1311bef0
[INFO] running `Command { std: "docker" "start" "-a" "9b26ae9fdbb39362cab080677d30782a05ee03845a0a2dc1e15114ce1311bef0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9b26ae9fdbb39362cab080677d30782a05ee03845a0a2dc1e15114ce1311bef0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b26ae9fdbb39362cab080677d30782a05ee03845a0a2dc1e15114ce1311bef0", kill_on_drop: false }`
[INFO] [stdout] 9b26ae9fdbb39362cab080677d30782a05ee03845a0a2dc1e15114ce1311bef0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] d1dd1f966be07260071bf70e537d8545236ebc7852f2a7d13a0f8bbc6b5b34af
[INFO] running `Command { std: "docker" "start" "-a" "d1dd1f966be07260071bf70e537d8545236ebc7852f2a7d13a0f8bbc6b5b34af", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking is-terminal v0.4.12
[INFO] [stderr]     Checking faccess v0.2.4
[INFO] [stderr]     Checking os_pipe v1.1.5
[INFO] [stderr]     Checking fs_extra v1.3.0
[INFO] [stderr]     Checking env_logger v0.10.2
[INFO] [stderr]     Checking rusty-forkfork v0.4.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling sealed_test_derive v1.0.0
[INFO] [stderr]    Compiling cmd_lib_macros v1.9.3
[INFO] [stderr]     Checking sealed_test v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking cmd_lib v1.9.3
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/lib.rs:243:13
[INFO] [stdout]     |
[INFO] [stdout] 242 |         let err = Err("Oh no");
[INFO] [stdout]     |                   ------------ type must be known at this point
[INFO] [stdout] 243 |         let _err = err?;
[INFO] [stdout]     |             ^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: consider giving `_err` an explicit type
[INFO] [stdout]     |
[INFO] [stdout] 243 |         let _err: /* Type */ = err?;
[INFO] [stdout]     |                 ++++++++++++
[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 `sealed_test` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "d1dd1f966be07260071bf70e537d8545236ebc7852f2a7d13a0f8bbc6b5b34af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1dd1f966be07260071bf70e537d8545236ebc7852f2a7d13a0f8bbc6b5b34af", kill_on_drop: false }`
[INFO] [stdout] d1dd1f966be07260071bf70e537d8545236ebc7852f2a7d13a0f8bbc6b5b34af