[INFO] fetching crate stella 0.0.3...
[INFO] checking stella-0.0.3 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate stella 0.0.3 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate stella 0.0.3 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 stella 0.0.3
[INFO] finished tweaking crates.io crate stella 0.0.3
[INFO] tweaked toml for crates.io crate stella 0.0.3 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate stella 0.0.3 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]  Downloading crates ...
[INFO] [stderr]   Downloaded rug v1.19.2
[INFO] [stderr]   Downloaded gmp-mpfr-sys v1.5.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 9c621b494119da2274367d3cf7875fbd0a873508398ca536aea03efe7b777e7a
[INFO] running `Command { std: "docker" "start" "-a" "9c621b494119da2274367d3cf7875fbd0a873508398ca536aea03efe7b777e7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c621b494119da2274367d3cf7875fbd0a873508398ca536aea03efe7b777e7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c621b494119da2274367d3cf7875fbd0a873508398ca536aea03efe7b777e7a", kill_on_drop: false }`
[INFO] [stdout] 9c621b494119da2274367d3cf7875fbd0a873508398ca536aea03efe7b777e7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] a8ed429444d6c9746c094638ba5f8ca8e7fac88542bc1fc74f05b266685673e5
[INFO] running `Command { std: "docker" "start" "-a" "a8ed429444d6c9746c094638ba5f8ca8e7fac88542bc1fc74f05b266685673e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.5.3
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling az v1.2.1
[INFO] [stderr]    Compiling rug v1.19.2
[INFO] [stderr]     Checking stella v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 42s
[INFO] running `Command { std: "docker" "inspect" "a8ed429444d6c9746c094638ba5f8ca8e7fac88542bc1fc74f05b266685673e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8ed429444d6c9746c094638ba5f8ca8e7fac88542bc1fc74f05b266685673e5", kill_on_drop: false }`
[INFO] [stdout] a8ed429444d6c9746c094638ba5f8ca8e7fac88542bc1fc74f05b266685673e5
[INFO] checking stella-0.0.3 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate stella 0.0.3 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate stella 0.0.3 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 stella 0.0.3
[INFO] finished tweaking crates.io crate stella 0.0.3
[INFO] tweaked toml for crates.io crate stella 0.0.3 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate crates.io crate stella 0.0.3 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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 9e003c514517797ec913f698a70aacd41e4d58a8de9e444d9ed0bad19714a77a
[INFO] running `Command { std: "docker" "start" "-a" "9e003c514517797ec913f698a70aacd41e4d58a8de9e444d9ed0bad19714a77a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e003c514517797ec913f698a70aacd41e4d58a8de9e444d9ed0bad19714a77a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e003c514517797ec913f698a70aacd41e4d58a8de9e444d9ed0bad19714a77a", kill_on_drop: false }`
[INFO] [stdout] 9e003c514517797ec913f698a70aacd41e4d58a8de9e444d9ed0bad19714a77a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] b15676d7f42597385dd8004bf90ea07882924c7ad31d0ecafdb8b263719944cb
[INFO] running `Command { std: "docker" "start" "-a" "b15676d7f42597385dd8004bf90ea07882924c7ad31d0ecafdb8b263719944cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.5.3
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling az v1.2.1
[INFO] [stderr]    Compiling rug v1.19.2
[INFO] [stderr]     Checking stella v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0283]: type annotations needed for `Result<JoinHandle<T>, std::io::Error>`
[INFO] [stdout]    --> src/lib.rs:286:8
[INFO] [stdout]     |
[INFO] [stdout] 286 |             let _ = thread::Builder::new().name(format!("Worker {0}", worker_id)).spawn(move || {
[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 `Builder::spawn`
[INFO] [stdout]    --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:381:5
[INFO] [stdout] help: consider giving this pattern a type, where the type for type parameter `T` is specified
[INFO] [stdout]     |
[INFO] [stdout] 286 |             let _: Result<JoinHandle<T>, std::io::Error> = thread::Builder::new().name(format!("Worker {0}", worker_id)).spawn(move || {
[INFO] [stdout]     |                  +++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed for `Result<JoinHandle<T>, std::io::Error>`
[INFO] [stdout]    --> src/lib.rs:286:8
[INFO] [stdout]     |
[INFO] [stdout] 286 |             let _ = thread::Builder::new().name(format!("Worker {0}", worker_id)).spawn(move || {
[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 `Builder::spawn`
[INFO] [stdout]    --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:381:5
[INFO] [stdout] help: consider giving this pattern a type, where the type for type parameter `T` is specified
[INFO] [stdout]     |
[INFO] [stdout] 286 |             let _: Result<JoinHandle<T>, std::io::Error> = thread::Builder::new().name(format!("Worker {0}", worker_id)).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] [stderr] error: could not compile `stella` (lib test) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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 `stella` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "b15676d7f42597385dd8004bf90ea07882924c7ad31d0ecafdb8b263719944cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b15676d7f42597385dd8004bf90ea07882924c7ad31d0ecafdb8b263719944cb", kill_on_drop: false }`
[INFO] [stdout] b15676d7f42597385dd8004bf90ea07882924c7ad31d0ecafdb8b263719944cb