[INFO] fetching crate iot-shell 0.1.0...
[INFO] checking iot-shell-0.1.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate iot-shell 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate iot-shell 0.1.0 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 iot-shell 0.1.0
[INFO] finished tweaking crates.io crate iot-shell 0.1.0
[INFO] tweaked toml for crates.io crate iot-shell 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate iot-shell 0.1.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded subprocess v0.2.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 7edc9965f4dc4e6e2434956d20a86c6f1dac1e73baf7ecd199d78f1ab49da8f6
[INFO] running `Command { std: "docker" "start" "-a" "7edc9965f4dc4e6e2434956d20a86c6f1dac1e73baf7ecd199d78f1ab49da8f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7edc9965f4dc4e6e2434956d20a86c6f1dac1e73baf7ecd199d78f1ab49da8f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7edc9965f4dc4e6e2434956d20a86c6f1dac1e73baf7ecd199d78f1ab49da8f6", kill_on_drop: false }`
[INFO] [stdout] 7edc9965f4dc4e6e2434956d20a86c6f1dac1e73baf7ecd199d78f1ab49da8f6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 8d232e177a8c05b0d576d5da5e794b309fe49d0b338c24691382e7472b2d6ef1
[INFO] running `Command { std: "docker" "start" "-a" "8d232e177a8c05b0d576d5da5e794b309fe49d0b338c24691382e7472b2d6ef1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking subprocess v0.2.4
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking iot-shell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.11s
[INFO] running `Command { std: "docker" "inspect" "8d232e177a8c05b0d576d5da5e794b309fe49d0b338c24691382e7472b2d6ef1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d232e177a8c05b0d576d5da5e794b309fe49d0b338c24691382e7472b2d6ef1", kill_on_drop: false }`
[INFO] [stdout] 8d232e177a8c05b0d576d5da5e794b309fe49d0b338c24691382e7472b2d6ef1
[INFO] checking iot-shell-0.1.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate iot-shell 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate iot-shell 0.1.0 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 iot-shell 0.1.0
[INFO] finished tweaking crates.io crate iot-shell 0.1.0
[INFO] tweaked toml for crates.io crate iot-shell 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate iot-shell 0.1.0 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] c1d29f6c627d402ac8aa0b0e526a8df31d36ae83260f7a38c0aa497cda158187
[INFO] running `Command { std: "docker" "start" "-a" "c1d29f6c627d402ac8aa0b0e526a8df31d36ae83260f7a38c0aa497cda158187", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1d29f6c627d402ac8aa0b0e526a8df31d36ae83260f7a38c0aa497cda158187", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1d29f6c627d402ac8aa0b0e526a8df31d36ae83260f7a38c0aa497cda158187", kill_on_drop: false }`
[INFO] [stdout] c1d29f6c627d402ac8aa0b0e526a8df31d36ae83260f7a38c0aa497cda158187
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 87e49ae40a4d6a56af22a5940098e34bd44e178a53b28f3d325be44b349d7ea2
[INFO] running `Command { std: "docker" "start" "-a" "87e49ae40a4d6a56af22a5940098e34bd44e178a53b28f3d325be44b349d7ea2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking subprocess v0.2.4
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/chrono-0.4.11/src/format/parse.rs:423:21
[INFO] [stdout]     |
[INFO] [stdout] 423 |                     Err(INVALID)?;
[INFO] [stdout]     |                     ^^^ cannot infer type of the type parameter `T` declared on the enum `Result`
[INFO] [stdout]     |
[INFO] [stdout] help: consider specifying the generic arguments
[INFO] [stdout]     |
[INFO] [stdout] 423 |                     Err::<T, format::ParseError>(INVALID)?;
[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 `chrono` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "87e49ae40a4d6a56af22a5940098e34bd44e178a53b28f3d325be44b349d7ea2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87e49ae40a4d6a56af22a5940098e34bd44e178a53b28f3d325be44b349d7ea2", kill_on_drop: false }`
[INFO] [stdout] 87e49ae40a4d6a56af22a5940098e34bd44e178a53b28f3d325be44b349d7ea2