[INFO] fetching crate twelf 0.1.7...
[INFO] testing twelf-0.1.7 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate twelf 0.1.7 into /workspace/builds/worker-113/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-113/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 }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/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] d256acdcf10ce1deed2b3d4164fcf167983ad6bfa3fe9ad2b621f89d31595c2d
[INFO] running `Command { std: "docker" "start" "-a" "d256acdcf10ce1deed2b3d4164fcf167983ad6bfa3fe9ad2b621f89d31595c2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d256acdcf10ce1deed2b3d4164fcf167983ad6bfa3fe9ad2b621f89d31595c2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d256acdcf10ce1deed2b3d4164fcf167983ad6bfa3fe9ad2b621f89d31595c2d", kill_on_drop: false }`
[INFO] [stdout] d256acdcf10ce1deed2b3d4164fcf167983ad6bfa3fe9ad2b621f89d31595c2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17548155cd1063afdff8436e9d74d1c37ec994618e84dcc5ea3b1a7c85fca756
[INFO] running `Command { std: "docker" "start" "-a" "17548155cd1063afdff8436e9d74d1c37ec994618e84dcc5ea3b1a7c85fca756", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling lexical-core v0.7.5
[INFO] [stderr]    Compiling futures-core v0.3.13
[INFO] [stderr]    Compiling openssl v0.10.33
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling futures-io v0.3.13
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling futures-sink v0.3.13
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling futures-task v0.3.13
[INFO] [stderr]    Compiling httparse v1.3.5
[INFO] [stderr]    Compiling typed-arena v1.7.0
[INFO] [stderr]    Compiling httpdate v0.3.2
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling cpuid-bool v0.1.2
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling linked-hash-map v0.5.4
[INFO] [stderr]    Compiling result v1.0.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling dtoa v0.4.7
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling openssl-sys v0.9.61
[INFO] [stderr]    Compiling tokio v1.3.0
[INFO] [stderr]    Compiling http v0.2.3
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling tinyvec v1.1.1
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling futures-channel v0.3.13
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling elsa v1.4.0
[INFO] [stderr]    Compiling tracing v0.1.25
[INFO] [stderr]    Compiling annotate-snippets v0.9.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling pretty v0.5.2
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling futures-util v0.3.13
[INFO] [stderr]    Compiling unicode-normalization v0.1.17
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]    Compiling mio v0.7.9
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling socket2 v0.3.19
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling native-tls v0.2.7
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling idna v0.2.2
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling sha2 v0.9.3
[INFO] [stderr]    Compiling url v2.2.1
[INFO] [stderr]    Compiling http-body v0.4.0
[INFO] [stderr]    Compiling abnf v0.6.1
[INFO] [stderr]    Compiling abnf_to_pest v0.5.0
[INFO] [stderr]    Compiling tokio-util v0.6.4
[INFO] [stderr]    Compiling tokio-native-tls v0.3.0
[INFO] [stderr]    Compiling h2 v0.3.1
[INFO] [stderr]    Compiling pest_generator v2.1.3
[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]    Compiling thiserror v1.0.24
[INFO] [stderr]    Compiling pest_consume v1.0.6
[INFO] [stderr]    Compiling pin-project v1.0.5
[INFO] [stderr]    Compiling hyper v0.14.4
[INFO] [stderr]    Compiling hyper-tls v0.5.0
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling envy v0.4.1
[INFO] [stderr]    Compiling serde_ini v0.2.0
[INFO] [stderr]    Compiling serde_yaml v0.8.17
[INFO] [stderr]    Compiling reqwest v0.11.2
[INFO] [stderr]    Compiling 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] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "17548155cd1063afdff8436e9d74d1c37ec994618e84dcc5ea3b1a7c85fca756", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17548155cd1063afdff8436e9d74d1c37ec994618e84dcc5ea3b1a7c85fca756", kill_on_drop: false }`
[INFO] [stdout] 17548155cd1063afdff8436e9d74d1c37ec994618e84dcc5ea3b1a7c85fca756
