[INFO] cloning repository https://github.com/mishan88/rust-howdoi
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mishan88/rust-howdoi" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmishan88%2Frust-howdoi", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmishan88%2Frust-howdoi'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f137a9f016d1c4f48f30d3ef3b5d0978fe47a74a
[INFO] documenting mishan88/rust-howdoi against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmishan88%2Frust-howdoi" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mishan88/rust-howdoi on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mishan88/rust-howdoi
[INFO] finished tweaking git repo https://github.com/mishan88/rust-howdoi
[INFO] tweaked toml for git repo https://github.com/mishan88/rust-howdoi written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/mishan88/rust-howdoi already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ego-tree v0.6.0
[INFO] [stderr]   Downloaded cssparser-macros v0.3.5
[INFO] [stderr]   Downloaded h2 v0.1.17
[INFO] [stderr]   Downloaded html5ever v0.22.5
[INFO] [stderr]   Downloaded reqwest v0.9.12
[INFO] [stderr]   Downloaded scraper v0.9.2
[INFO] [stderr]   Downloaded cssparser v0.24.1
[INFO] [stderr]   Downloaded uuid v0.7.3
[INFO] [stderr]   Downloaded markup5ever v0.7.5
[INFO] [stderr]   Downloaded selectors v0.20.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0ea33ee9c59ce4631cfd8b609add915d5a96bdb27678d123b19fb3c7e42b9c2b
[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" "0ea33ee9c59ce4631cfd8b609add915d5a96bdb27678d123b19fb3c7e42b9c2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ea33ee9c59ce4631cfd8b609add915d5a96bdb27678d123b19fb3c7e42b9c2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ea33ee9c59ce4631cfd8b609add915d5a96bdb27678d123b19fb3c7e42b9c2b", kill_on_drop: false }`
[INFO] [stdout] 0ea33ee9c59ce4631cfd8b609add915d5a96bdb27678d123b19fb3c7e42b9c2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a78fd4a1d7485c3508e365011179ba8119b190011a21d2410d5d7335a55942d8
[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" "a78fd4a1d7485c3508e365011179ba8119b190011a21d2410d5d7335a55942d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking new_debug_unreachable v1.0.3
[INFO] [stderr]    Compiling openssl v0.10.20
[INFO] [stderr]    Compiling encoding_rs v0.8.17
[INFO] [stderr]     Checking thin-slice v0.1.1
[INFO] [stderr]     Checking ego-tree v0.6.0
[INFO] [stderr]     Checking termcolor v1.0.4
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]    Compiling unicase v2.3.0
[INFO] [stderr]     Checking tokio-trace-core v0.1.0
[INFO] [stderr]    Compiling miniz_oxide_c_api v0.2.1
[INFO] [stderr]     Checking unicode-normalization v0.1.8
[INFO] [stderr]     Checking tokio-sync v0.1.4
[INFO] [stderr]     Checking miniz_oxide v0.2.1
[INFO] [stderr]     Checking getopts v0.2.18
[INFO] [stderr]     Checking tokio-executor v0.1.7
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling serde v1.0.89
[INFO] [stderr]     Checking futf v0.1.4
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]     Checking arrayvec v0.4.10
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[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling syn v0.14.9
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[INFO] [stderr]     Checking uuid v0.7.3
[INFO] [stderr]     Checking mio v0.6.16
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[INFO] [stderr]    Compiling native-tls v0.2.2
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio v0.1.18
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling string_cache_codegen v0.4.2
[INFO] [stderr]    Compiling selectors v0.20.0
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]     Checking serde_urlencoded v0.5.4
[INFO] [stderr]     Checking h2 v0.1.17
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]     Checking hyper v0.12.25
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]     Checking reqwest v0.9.12
[INFO] [stderr]    Compiling cssparser v0.24.1
[INFO] [stderr]    Compiling serde_derive v1.0.89
[INFO] [stderr]    Compiling cssparser-macros v0.3.5
[INFO] [stderr]    Compiling html5ever v0.22.5
[INFO] [stdout] error[E0506]: cannot assign to `self.input.cached_token` because it is borrowed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/cssparser-0.24.1/src/parser.rs:572:17
[INFO] [stdout]     |
[INFO] [stdout] 547 |     pub fn next_including_whitespace_and_comments(&mut self) -> Result<&Token<'i>, BasicParseError<'i>> {
[INFO] [stdout]     |                                                   - let's call the lifetime of this reference `'1`
[INFO] [stdout] ...
[INFO] [stdout] 560 |             Some(ref cached_token)
[INFO] [stdout]     |                  ---------------- borrow of `self.input.cached_token` occurs here
[INFO] [stdout] ...
[INFO] [stdout] 572 |                 self.input.cached_token = Some(CachedToken {
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `self.input.cached_token` occurs here
[INFO] [stdout] ...
[INFO] [stdout] 584 |         Ok(token)
[INFO] [stdout]     |         --------- returning this value requires that `self.input.cached_token.0` is borrowed for `'1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0506`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cssparser`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a78fd4a1d7485c3508e365011179ba8119b190011a21d2410d5d7335a55942d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a78fd4a1d7485c3508e365011179ba8119b190011a21d2410d5d7335a55942d8", kill_on_drop: false }`
[INFO] [stdout] a78fd4a1d7485c3508e365011179ba8119b190011a21d2410d5d7335a55942d8