[INFO] fetching crate twelf 0.1.7...
[INFO] documenting twelf-0.1.7 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate twelf 0.1.7 into /workspace/builds/worker-44/source
[INFO] validating manifest of crates.io crate twelf 0.1.7 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate twelf 0.1.7
[INFO] finished tweaking crates.io crate twelf 0.1.7
[INFO] tweaked toml for crates.io crate twelf 0.1.7 written to /workspace/builds/worker-44/source/Cargo.toml
[INFO] crate crates.io crate twelf 0.1.7 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 05e229c70861e0bdd0e8da70387c6312bfba0adf774af98271874df5d11635cd
[INFO] running `Command { std: "docker" "start" "-a" "05e229c70861e0bdd0e8da70387c6312bfba0adf774af98271874df5d11635cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05e229c70861e0bdd0e8da70387c6312bfba0adf774af98271874df5d11635cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05e229c70861e0bdd0e8da70387c6312bfba0adf774af98271874df5d11635cd", kill_on_drop: false }`
[INFO] [stdout] 05e229c70861e0bdd0e8da70387c6312bfba0adf774af98271874df5d11635cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0cdf6d8d7198c089960cce4cdfe73b83c086781adc3204c31ef5810aa61c3fe
[INFO] running `Command { std: "docker" "start" "-a" "d0cdf6d8d7198c089960cce4cdfe73b83c086781adc3204c31ef5810aa61c3fe", kill_on_drop: false }`
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[INFO] [stderr]     Checking serde_dhall v0.10.0
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a closure that returns `Result`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_dhall-0.10.0/src/value.rs:481:62
[INFO] [stdout]     |
[INFO] [stdout] 481 | ...                   .map(|v| Ok(Self::from_nir(v)?))
[INFO] [stdout]     |                            ------------------------^-
[INFO] [stdout]     |                            |                       |
[INFO] [stdout]     |                            |                       use `.ok_or(...)?` to provide an error compatible with `std::result::Result<SimpleType, _>`
[INFO] [stdout]     |                            this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::option::Option<Infallible>>` is not implemented for `std::result::Result<SimpleType, _>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Option`s, not `Result`s, in a closure that returns `Option`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_dhall-0.10.0/src/value.rs:482:45
[INFO] [stdout]     |
[INFO] [stdout] 477 |                       .map(|(k, v)| {
[INFO] [stdout]     |  __________________________-
[INFO] [stdout] 478 | |                         Some((
[INFO] [stdout] 479 | |                             k.into(),
[INFO] [stdout] 480 | |                             v.as_ref()
[INFO] [stdout] 481 | |                                 .map(|v| Ok(Self::from_nir(v)?))
[INFO] [stdout] 482 | |                                 .transpose()?,
[INFO] [stdout]     | |                                             ^ use `.ok()?` if you want to discard the `std::result::Result<Infallible, _>` error information
[INFO] [stdout] 483 | |                         ))
[INFO] [stdout] 484 | |                     })
[INFO] [stdout]     | |_____________________- this function returns an `Option`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<std::result::Result<Infallible, _>>` is not implemented for `std::option::Option<(_, std::option::Option<SimpleType>)>`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_dhall` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "d0cdf6d8d7198c089960cce4cdfe73b83c086781adc3204c31ef5810aa61c3fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0cdf6d8d7198c089960cce4cdfe73b83c086781adc3204c31ef5810aa61c3fe", kill_on_drop: false }`
[INFO] [stdout] d0cdf6d8d7198c089960cce4cdfe73b83c086781adc3204c31ef5810aa61c3fe
