[INFO] cloning repository https://github.com/Super-King-Crimson/fearless_concurrency
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Super-King-Crimson/fearless_concurrency" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSuper-King-Crimson%2Ffearless_concurrency", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSuper-King-Crimson%2Ffearless_concurrency'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 012edeecd346b551066f8898ef15d2d28f32985e
[INFO] checking Super-King-Crimson/fearless_concurrency against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSuper-King-Crimson%2Ffearless_concurrency" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Super-King-Crimson/fearless_concurrency 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 git repo https://github.com/Super-King-Crimson/fearless_concurrency
[INFO] finished tweaking git repo https://github.com/Super-King-Crimson/fearless_concurrency
[INFO] tweaked toml for git repo https://github.com/Super-King-Crimson/fearless_concurrency written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Super-King-Crimson/fearless_concurrency 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] 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] 4d243ed28fd036c39cb06803384321f8eeb07551e36f7210dcf3fd6eaa975903
[INFO] running `Command { std: "docker" "start" "-a" "4d243ed28fd036c39cb06803384321f8eeb07551e36f7210dcf3fd6eaa975903", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d243ed28fd036c39cb06803384321f8eeb07551e36f7210dcf3fd6eaa975903", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d243ed28fd036c39cb06803384321f8eeb07551e36f7210dcf3fd6eaa975903", kill_on_drop: false }`
[INFO] [stdout] 4d243ed28fd036c39cb06803384321f8eeb07551e36f7210dcf3fd6eaa975903
[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] 06d01cd0a8b560243213dda69a89797f3dcbadec0df81eedeefbd20a18ffd1a0
[INFO] running `Command { std: "docker" "start" "-a" "06d01cd0a8b560243213dda69a89797f3dcbadec0df81eedeefbd20a18ffd1a0", kill_on_drop: false }`
[INFO] [stderr]     Checking fearless_concurrency v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "06d01cd0a8b560243213dda69a89797f3dcbadec0df81eedeefbd20a18ffd1a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06d01cd0a8b560243213dda69a89797f3dcbadec0df81eedeefbd20a18ffd1a0", kill_on_drop: false }`
[INFO] [stdout] 06d01cd0a8b560243213dda69a89797f3dcbadec0df81eedeefbd20a18ffd1a0
[INFO] checking Super-King-Crimson/fearless_concurrency against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSuper-King-Crimson%2Ffearless_concurrency" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Super-King-Crimson/fearless_concurrency 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 git repo https://github.com/Super-King-Crimson/fearless_concurrency
[INFO] finished tweaking git repo https://github.com/Super-King-Crimson/fearless_concurrency
[INFO] tweaked toml for git repo https://github.com/Super-King-Crimson/fearless_concurrency written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Super-King-Crimson/fearless_concurrency 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-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] f47e341a7f5dce27abeac669fb023c699a9c1f6cc5baebf7f1af3ca307f27dd3
[INFO] running `Command { std: "docker" "start" "-a" "f47e341a7f5dce27abeac669fb023c699a9c1f6cc5baebf7f1af3ca307f27dd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f47e341a7f5dce27abeac669fb023c699a9c1f6cc5baebf7f1af3ca307f27dd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f47e341a7f5dce27abeac669fb023c699a9c1f6cc5baebf7f1af3ca307f27dd3", kill_on_drop: false }`
[INFO] [stdout] f47e341a7f5dce27abeac669fb023c699a9c1f6cc5baebf7f1af3ca307f27dd3
[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] 14addb2b5e3359adc0ee3d93f45e75012fca4d9c98fa1d30bfaef960d8e93337
[INFO] running `Command { std: "docker" "start" "-a" "14addb2b5e3359adc0ee3d93f45e75012fca4d9c98fa1d30bfaef960d8e93337", kill_on_drop: false }`
[INFO] [stderr]     Checking fearless_concurrency v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0283]: type annotations needed for `JoinHandle<T>`
[INFO] [stdout]   --> src/shared_state/mutex_vs_refcell.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |       let char_thread = thread::spawn(move || {
[INFO] [stdout]    |  _________^^^^^^^^^^^___-
[INFO] [stdout] 54 | |         println!("Doing calculations to push some strs");
[INFO] [stdout] 55 | |         thread::sleep(Duration::from_millis(500));
[INFO] [stdout] ...  |
[INFO] [stdout] 82 | |         }
[INFO] [stdout] 83 | |     });
[INFO] [stdout]    | |______- type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `spawn`
[INFO] [stdout]   --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:672:1
[INFO] [stdout] help: consider giving `char_thread` an explicit type, where the type for type parameter `T` is specified
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let char_thread: JoinHandle<T> = thread::spawn(move || {
[INFO] [stdout]    |                    +++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed for `JoinHandle<T>`
[INFO] [stdout]   --> src/shared_state/mutex_vs_refcell.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |       let char_thread = thread::spawn(move || {
[INFO] [stdout]    |  _________^^^^^^^^^^^___-
[INFO] [stdout] 54 | |         println!("Doing calculations to push some strs");
[INFO] [stdout] 55 | |         thread::sleep(Duration::from_millis(500));
[INFO] [stdout] ...  |
[INFO] [stdout] 82 | |         }
[INFO] [stdout] 83 | |     });
[INFO] [stdout]    | |______- type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `spawn`
[INFO] [stdout]   --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:672:1
[INFO] [stdout] help: consider giving `char_thread` an explicit type, where the type for type parameter `T` is specified
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let char_thread: JoinHandle<T> = thread::spawn(move || {
[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 E0283`.
[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 E0283`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fearless_concurrency` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `fearless_concurrency` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "14addb2b5e3359adc0ee3d93f45e75012fca4d9c98fa1d30bfaef960d8e93337", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14addb2b5e3359adc0ee3d93f45e75012fca4d9c98fa1d30bfaef960d8e93337", kill_on_drop: false }`
[INFO] [stdout] 14addb2b5e3359adc0ee3d93f45e75012fca4d9c98fa1d30bfaef960d8e93337