[INFO] fetching crate twelf 0.1.7...
[INFO] checking twelf-0.1.7 against beta-2021-10-15 for beta-1.56-3
[INFO] extracting crate twelf 0.1.7 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate twelf 0.1.7 on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "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-7/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-2021-10-15" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0786aefc180a6b7fa5692e95fc85f5e0311ece0ac46c5530902b8f21a6312724
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0786aefc180a6b7fa5692e95fc85f5e0311ece0ac46c5530902b8f21a6312724", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0786aefc180a6b7fa5692e95fc85f5e0311ece0ac46c5530902b8f21a6312724", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0786aefc180a6b7fa5692e95fc85f5e0311ece0ac46c5530902b8f21a6312724", kill_on_drop: false }`
[INFO] [stdout] 0786aefc180a6b7fa5692e95fc85f5e0311ece0ac46c5530902b8f21a6312724
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-10-15" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7ee82b0d8af7a9bebabe9cdd5bb6cbcffcc70320c2bc232e86a215a239eb791
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e7ee82b0d8af7a9bebabe9cdd5bb6cbcffcc70320c2bc232e86a215a239eb791", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling typed-arena v1.7.0
[INFO] [stderr]     Checking result v1.0.0
[INFO] [stderr]    Compiling tokio v1.3.0
[INFO] [stderr]     Checking futures-channel v0.3.13
[INFO] [stderr]     Checking elsa v1.4.0
[INFO] [stderr]     Checking annotate-snippets v0.9.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking openssl-sys v0.9.61
[INFO] [stderr]     Checking futures-util v0.3.13
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking generic-array v0.14.4
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling pretty v0.5.2
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]    Compiling lexical-core v0.7.5
[INFO] [stderr]     Checking sha2 v0.9.3
[INFO] [stderr]     Checking openssl v0.10.33
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking native-tls v0.2.7
[INFO] [stderr]     Checking tokio-util v0.6.4
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.3.1
[INFO] [stderr]    Compiling abnf v0.6.1
[INFO] [stderr]    Compiling abnf_to_pest v0.5.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling pin-project-internal v1.0.5
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling dhall v0.10.0
[INFO] [stderr]    Compiling pest_consume_macros v1.0.6
[INFO] [stderr]    Compiling dhall_proc_macros v0.5.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[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
[INFO] [stderr]     Checking serde v1.0.117
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking serde_cbor v0.11.1
[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 serde_ini v0.2.0
[INFO] [stderr]     Checking toml v0.5.8
[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` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "e7ee82b0d8af7a9bebabe9cdd5bb6cbcffcc70320c2bc232e86a215a239eb791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7ee82b0d8af7a9bebabe9cdd5bb6cbcffcc70320c2bc232e86a215a239eb791", kill_on_drop: false }`
[INFO] [stdout] e7ee82b0d8af7a9bebabe9cdd5bb6cbcffcc70320c2bc232e86a215a239eb791
