[INFO] fetching crate math_rust 0.1.7...
[INFO] checking math_rust-0.1.7 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate math_rust 0.1.7 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate math_rust 0.1.7 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 math_rust 0.1.7
[INFO] finished tweaking crates.io crate math_rust 0.1.7
[INFO] tweaked toml for crates.io crate math_rust 0.1.7 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate math_rust 0.1.7 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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 7425b2b35248391fac1dfd4ae6c05931b207932a9e5aff96f6d1c6da58d015e1
[INFO] running `Command { std: "docker" "start" "-a" "7425b2b35248391fac1dfd4ae6c05931b207932a9e5aff96f6d1c6da58d015e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7425b2b35248391fac1dfd4ae6c05931b207932a9e5aff96f6d1c6da58d015e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7425b2b35248391fac1dfd4ae6c05931b207932a9e5aff96f6d1c6da58d015e1", kill_on_drop: false }`
[INFO] [stdout] 7425b2b35248391fac1dfd4ae6c05931b207932a9e5aff96f6d1c6da58d015e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] c58588d0c01e5ae82ea039a62f8fb5d5eb790e27e9b15c727699ebcf42045cd5
[INFO] running `Command { std: "docker" "start" "-a" "c58588d0c01e5ae82ea039a62f8fb5d5eb790e27e9b15c727699ebcf42045cd5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking math_rust v0.1.7 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `Command { std: "docker" "inspect" "c58588d0c01e5ae82ea039a62f8fb5d5eb790e27e9b15c727699ebcf42045cd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c58588d0c01e5ae82ea039a62f8fb5d5eb790e27e9b15c727699ebcf42045cd5", kill_on_drop: false }`
[INFO] [stdout] c58588d0c01e5ae82ea039a62f8fb5d5eb790e27e9b15c727699ebcf42045cd5
[INFO] checking math_rust-0.1.7 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate math_rust 0.1.7 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate math_rust 0.1.7 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 math_rust 0.1.7
[INFO] finished tweaking crates.io crate math_rust 0.1.7
[INFO] tweaked toml for crates.io crate math_rust 0.1.7 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate math_rust 0.1.7 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 9714f14493d5ccf01f18435d381ccbe3b4b22d2e763f353b1a992f978db95bed
[INFO] running `Command { std: "docker" "start" "-a" "9714f14493d5ccf01f18435d381ccbe3b4b22d2e763f353b1a992f978db95bed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9714f14493d5ccf01f18435d381ccbe3b4b22d2e763f353b1a992f978db95bed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9714f14493d5ccf01f18435d381ccbe3b4b22d2e763f353b1a992f978db95bed", kill_on_drop: false }`
[INFO] [stdout] 9714f14493d5ccf01f18435d381ccbe3b4b22d2e763f353b1a992f978db95bed
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] eda0b1a417a5f6f83bf99e704174e0454bd78837b5f0c839998e32c72fe08a06
[INFO] running `Command { std: "docker" "start" "-a" "eda0b1a417a5f6f83bf99e704174e0454bd78837b5f0c839998e32c72fe08a06", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking math_rust v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | /     if x.len() % 2 == 0 {
[INFO] [stdout] 26 | |       return (arr[mid - 1] + x[mid]) as f64 / 2.0;
[INFO] [stdout] 27 | |     } else {
[INFO] [stdout] 28 | |       return arr[mid] as f64;
[INFO] [stdout] 29 | |     };  
[INFO] [stdout]    | |_____^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | /     if x.len() % 2 == 0 {
[INFO] [stdout] 26 | |       return (arr[mid - 1] + x[mid]) as f64 / 2.0;
[INFO] [stdout] 27 | |     } else {
[INFO] [stdout] 28 | |       return arr[mid] as f64;
[INFO] [stdout] 29 | |     };  
[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] [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 `math_rust` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `math_rust` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "eda0b1a417a5f6f83bf99e704174e0454bd78837b5f0c839998e32c72fe08a06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eda0b1a417a5f6f83bf99e704174e0454bd78837b5f0c839998e32c72fe08a06", kill_on_drop: false }`
[INFO] [stdout] eda0b1a417a5f6f83bf99e704174e0454bd78837b5f0c839998e32c72fe08a06