[INFO] cloning repository https://github.com/rettgerst/exercism-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rettgerst/exercism-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frettgerst%2Fexercism-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frettgerst%2Fexercism-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cc56769adf16872479dcd437e9d43cf3396652d3
[INFO] checking rettgerst/exercism-rust against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frettgerst%2Fexercism-rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rettgerst/exercism-rust 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/rettgerst/exercism-rust
[INFO] finished tweaking git repo https://github.com/rettgerst/exercism-rust
[INFO] tweaked toml for git repo https://github.com/rettgerst/exercism-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rettgerst/exercism-rust 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-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] be1caca4775025730fb4c9ff4c46cc24db62ffb8758f3eb45d617afcce4506ad
[INFO] running `Command { std: "docker" "start" "-a" "be1caca4775025730fb4c9ff4c46cc24db62ffb8758f3eb45d617afcce4506ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be1caca4775025730fb4c9ff4c46cc24db62ffb8758f3eb45d617afcce4506ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be1caca4775025730fb4c9ff4c46cc24db62ffb8758f3eb45d617afcce4506ad", kill_on_drop: false }`
[INFO] [stdout] be1caca4775025730fb4c9ff4c46cc24db62ffb8758f3eb45d617afcce4506ad
[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] 04e75a08cbaedd1b46d9af90b8c8cc2a814796f4058b6b9862f322fe3f374d6c
[INFO] running `Command { std: "docker" "start" "-a" "04e75a08cbaedd1b46d9af90b8c8cc2a814796f4058b6b9862f322fe3f374d6c", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking unicode-segmentation v1.7.1
[INFO] [stderr]     Checking matching-brackets v2.0.0 (/opt/rustwide/workdir/matching-brackets)
[INFO] [stderr]     Checking high-scores v4.0.0 (/opt/rustwide/workdir/high-scores)
[INFO] [stderr]     Checking raindrops v1.1.0 (/opt/rustwide/workdir/raindrops)
[INFO] [stderr]     Checking leap v1.6.0 (/opt/rustwide/workdir/leap)
[INFO] [stderr]     Checking grains v1.2.0 (/opt/rustwide/workdir/grains)
[INFO] [stderr]     Checking bob v1.6.0 (/opt/rustwide/workdir/bob)
[INFO] [stderr]     Checking diffie-hellman v0.1.0 (/opt/rustwide/workdir/diffie-hellman)
[INFO] [stderr]     Checking hello-world v1.1.0 (/opt/rustwide/workdir/hello-world)
[INFO] [stderr]     Checking collatz_conjecture v1.2.1 (/opt/rustwide/workdir/collatz-conjecture)
[INFO] [stderr]     Checking sum-of-multiples v1.5.0 (/opt/rustwide/workdir/sum-of-multiples)
[INFO] [stderr]     Checking prime_factors v1.1.0 (/opt/rustwide/workdir/prime-factors)
[INFO] [stderr]     Checking difference-of-squares v1.2.0 (/opt/rustwide/workdir/difference-of-squares)
[INFO] [stderr]     Checking series v0.1.0 (/opt/rustwide/workdir/series)
[INFO] [stderr]     Checking beer-song v0.0.0 (/opt/rustwide/workdir/beer-song)
[INFO] [stderr]     Checking nth_prime v2.1.0 (/opt/rustwide/workdir/nth-prime)
[INFO] [stderr]     Checking armstrong_numbers v1.1.0 (/opt/rustwide/workdir/armstrong-numbers)
[INFO] [stderr]     Checking proverb v1.1.0 (/opt/rustwide/workdir/proverb)
[INFO] [stderr]     Checking reverse_string v1.2.0 (/opt/rustwide/workdir/reverse-string)
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking gigasecond v2.0.0 (/opt/rustwide/workdir/gigasecond)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.29s
[INFO] running `Command { std: "docker" "inspect" "04e75a08cbaedd1b46d9af90b8c8cc2a814796f4058b6b9862f322fe3f374d6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04e75a08cbaedd1b46d9af90b8c8cc2a814796f4058b6b9862f322fe3f374d6c", kill_on_drop: false }`
[INFO] [stdout] 04e75a08cbaedd1b46d9af90b8c8cc2a814796f4058b6b9862f322fe3f374d6c
[INFO] checking rettgerst/exercism-rust against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frettgerst%2Fexercism-rust" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rettgerst/exercism-rust 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/rettgerst/exercism-rust
[INFO] finished tweaking git repo https://github.com/rettgerst/exercism-rust
[INFO] tweaked toml for git repo https://github.com/rettgerst/exercism-rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/rettgerst/exercism-rust 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] 9a5c17be509f3c33b4f56b4c2baa2577d1112d59e443c4808ad2f682607ce314
[INFO] running `Command { std: "docker" "start" "-a" "9a5c17be509f3c33b4f56b4c2baa2577d1112d59e443c4808ad2f682607ce314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a5c17be509f3c33b4f56b4c2baa2577d1112d59e443c4808ad2f682607ce314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a5c17be509f3c33b4f56b4c2baa2577d1112d59e443c4808ad2f682607ce314", kill_on_drop: false }`
[INFO] [stdout] 9a5c17be509f3c33b4f56b4c2baa2577d1112d59e443c4808ad2f682607ce314
[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] 42f32c5a6dab89ba7a29975de2fc52d9bba71256caa9c7b31a42d2de2f423e68
[INFO] running `Command { std: "docker" "start" "-a" "42f32c5a6dab89ba7a29975de2fc52d9bba71256caa9c7b31a42d2de2f423e68", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking unicode-segmentation v1.7.1
[INFO] [stderr]     Checking beer-song v0.0.0 (/opt/rustwide/workdir/beer-song)
[INFO] [stderr]     Checking hello-world v1.1.0 (/opt/rustwide/workdir/hello-world)
[INFO] [stderr]     Checking sum-of-multiples v1.5.0 (/opt/rustwide/workdir/sum-of-multiples)
[INFO] [stderr]     Checking prime_factors v1.1.0 (/opt/rustwide/workdir/prime-factors)
[INFO] [stderr]     Checking bob v1.6.0 (/opt/rustwide/workdir/bob)
[INFO] [stderr]     Checking difference-of-squares v1.2.0 (/opt/rustwide/workdir/difference-of-squares)
[INFO] [stderr]     Checking high-scores v4.0.0 (/opt/rustwide/workdir/high-scores)
[INFO] [stderr]     Checking proverb v1.1.0 (/opt/rustwide/workdir/proverb)
[INFO] [stderr]     Checking matching-brackets v2.0.0 (/opt/rustwide/workdir/matching-brackets)
[INFO] [stderr]     Checking series v0.1.0 (/opt/rustwide/workdir/series)
[INFO] [stderr]     Checking leap v1.6.0 (/opt/rustwide/workdir/leap)
[INFO] [stderr]     Checking armstrong_numbers v1.1.0 (/opt/rustwide/workdir/armstrong-numbers)
[INFO] [stderr]     Checking nth_prime v2.1.0 (/opt/rustwide/workdir/nth-prime)
[INFO] [stderr]     Checking grains v1.2.0 (/opt/rustwide/workdir/grains)
[INFO] [stderr]     Checking collatz_conjecture v1.2.1 (/opt/rustwide/workdir/collatz-conjecture)
[INFO] [stderr]     Checking raindrops v1.1.0 (/opt/rustwide/workdir/raindrops)
[INFO] [stderr]     Checking diffie-hellman v0.1.0 (/opt/rustwide/workdir/diffie-hellman)
[INFO] [stderr]     Checking reverse_string v1.2.0 (/opt/rustwide/workdir/reverse-string)
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/chrono-0.4.19/src/format/parse.rs:491:21
[INFO] [stdout]     |
[INFO] [stdout] 491 |                     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] 491 |                     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" "42f32c5a6dab89ba7a29975de2fc52d9bba71256caa9c7b31a42d2de2f423e68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42f32c5a6dab89ba7a29975de2fc52d9bba71256caa9c7b31a42d2de2f423e68", kill_on_drop: false }`
[INFO] [stdout] 42f32c5a6dab89ba7a29975de2fc52d9bba71256caa9c7b31a42d2de2f423e68