[INFO] fetching crate twelf 0.1.7...
[INFO] documenting twelf-0.1.7 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate twelf 0.1.7 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate twelf 0.1.7 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-4/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" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4f61bd463f45cb47716b384bcfb02a70ff59c11a7a2d96db8549a2cc7c8d4152
[INFO] running `Command { std: "docker" "start" "-a" "4f61bd463f45cb47716b384bcfb02a70ff59c11a7a2d96db8549a2cc7c8d4152", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4f61bd463f45cb47716b384bcfb02a70ff59c11a7a2d96db8549a2cc7c8d4152", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f61bd463f45cb47716b384bcfb02a70ff59c11a7a2d96db8549a2cc7c8d4152", kill_on_drop: false }`
[INFO] [stdout] 4f61bd463f45cb47716b384bcfb02a70ff59c11a7a2d96db8549a2cc7c8d4152
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f4695aa6e9c0b180d6e47fa810c81c37f4157535cffd612023aee21faf7b5d7e
[INFO] running `Command { std: "docker" "start" "-a" "f4695aa6e9c0b180d6e47fa810c81c37f4157535cffd612023aee21faf7b5d7e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]     Checking futures-core v0.3.13
[INFO] [stderr]    Compiling lexical-core v0.7.5
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling openssl v0.10.33
[INFO] [stderr]     Checking futures-sink v0.3.13
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling httparse v1.3.5
[INFO] [stderr]     Checking futures-io v0.3.13
[INFO] [stderr]     Checking futures-task v0.3.13
[INFO] [stderr]    Compiling native-tls v0.2.7
[INFO] [stderr]    Compiling typed-arena v1.7.0
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]     Checking openssl-probe v0.1.2
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling encoding_rs v0.8.28
[INFO] [stderr]     Checking httpdate v0.3.2
[INFO] [stderr]     Checking tower-service v0.3.1
[INFO] [stderr]     Checking ipnet v2.3.0
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
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[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking result v1.0.0
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[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling openssl-sys v0.9.61
[INFO] [stderr]    Compiling tokio v1.3.0
[INFO] [stderr]    Compiling nom v5.1.2
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[INFO] [stderr]    Compiling generic-array v0.14.4
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[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking futures-channel v0.3.13
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling pretty v0.5.2
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[INFO] [stderr]     Checking elsa v1.4.0
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[INFO] [stderr]     Checking atty v0.2.14
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[INFO] [stderr]     Checking tokio-util v0.6.4
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[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]     Checking h2 v0.3.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.5
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling pest_consume_macros v1.0.6
[INFO] [stderr]    Compiling dhall v0.10.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]    Compiling dhall_proc_macros v0.5.0
[INFO] [stderr]    Compiling config-derive v0.1.7
[INFO] [stderr]     Checking thiserror v1.0.24
[INFO] [stderr]     Checking pest_consume v1.0.6
[INFO] [stderr]     Checking pin-project v1.0.5
[INFO] [stderr]     Checking hyper v0.14.4
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[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking serde_cbor v0.11.1
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[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stderr]     Checking envy v0.4.1
[INFO] [stderr]     Checking serde_yaml v0.8.17
[INFO] [stderr]     Checking reqwest v0.11.2
[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`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f4695aa6e9c0b180d6e47fa810c81c37f4157535cffd612023aee21faf7b5d7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4695aa6e9c0b180d6e47fa810c81c37f4157535cffd612023aee21faf7b5d7e", kill_on_drop: false }`
[INFO] [stdout] f4695aa6e9c0b180d6e47fa810c81c37f4157535cffd612023aee21faf7b5d7e
