[INFO] updating cached repository https://github.com/oberien/pundoc
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5a0743a1e66c1947dab6cb9b8a5e4f2a365f1e8b
[INFO] checking oberien/pundoc against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foberien%2Fpundoc" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/oberien/pundoc on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/oberien/pundoc
[INFO] finished tweaking git repo https://github.com/oberien/pundoc
[INFO] tweaked toml for git repo https://github.com/oberien/pundoc written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/oberien/pundoc already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 974fbed96d7b2bee6675ec801f65d21b162d0083c1269f9495f75550d6ce1c17
[INFO] running `"docker" "start" "-a" "974fbed96d7b2bee6675ec801f65d21b162d0083c1269f9495f75550d6ce1c17"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling openssl v0.10.14
[INFO] [stderr]    Compiling pulldown-cmark v0.4.0
[INFO] [stderr]     Checking str-concat v0.1.4
[INFO] [stderr]     Checking strum v0.11.0
[INFO] [stderr]     Checking quoted-string v0.6.0
[INFO] [stderr]     Checking log v0.4.5
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]     Checking crossbeam-epoch v0.5.2
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking rand v0.4.3
[INFO] [stderr]     Checking openssl-sys v0.9.39
[INFO] [stderr]    Compiling native-tls v0.2.1
[INFO] [stderr]     Checking aho-corasick v0.6.8
[INFO] [stderr]    Compiling syn v0.15.13
[INFO] [stderr]     Checking bytes v0.4.10
[INFO] [stderr]    Compiling enum-kinds v0.4.1
[INFO] [stderr]     Checking block-buffer v0.7.0
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking want v0.0.6
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking crossbeam-deque v0.6.1
[INFO] [stderr]     Checking regex v1.1.0
[INFO] [stderr]     Checking sha2 v0.8.0
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking backtrace v0.3.14
[INFO] [stderr]     Checking tokio-io v0.1.9
[INFO] [stderr]     Checking http v0.1.13
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking parking_lot_core v0.3.1
[INFO] [stderr]     Checking tokio-threadpool v0.1.7
[INFO] [stderr]     Checking uuid v0.7.1
[INFO] [stderr]    Compiling phf_generator v0.7.23
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]    Compiling phf_codegen v0.7.23
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]    Compiling isolang v0.2.1
[INFO] [stderr]     Checking tokio-fs v0.1.3
[INFO] [stderr]     Checking tokio-reactor v0.1.6
[INFO] [stderr]     Checking h2 v0.1.13
[INFO] [stderr]     Checking tokio-udp v0.1.2
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]     Checking tokio-uds v0.2.2
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]     Checking tokio v0.1.11
[INFO] [stderr]    Compiling serde_derive v1.0.80
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling structopt-derive v0.2.12
[INFO] [stderr]    Compiling strum_macros v0.11.0
[INFO] [stderr]     Checking hyper v0.12.12
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking codespan v0.2.1 (https://github.com/oberien/codespan?rev=dc7b13739165fc58721415ce3120d05cf117ca81#dc7b1373)
[INFO] [stderr]     Checking single v1.0.0
[INFO] [stderr]     Checking structopt v0.2.12
[INFO] [stderr]     Checking codespan-reporting v0.2.1 (https://github.com/oberien/codespan?rev=dc7b13739165fc58721415ce3120d05cf117ca81#dc7b1373)
[INFO] [stderr]     Checking hyper-tls v0.3.1
[INFO] [stderr]     Checking serde v1.0.89
[INFO] [stderr]     Checking serde_json v1.0.32
[INFO] [stderr]     Checking serde_urlencoded v0.5.3
[INFO] [stderr]     Checking toml v0.5.0
[INFO] [stderr]     Checking reqwest v0.9.3
[INFO] [stderr]     Checking heradoc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0277]: cannot add-assign `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]    --> src/frontend/mod.rs:254:45
[INFO] [stderr]     |
[INFO] [stderr] 254 |                 CmarkEvent::Text(text) => s += &text,
[INFO] [stderr]     |                                             ^^ no implementation for `std::string::String += &std::borrow::Cow<'_, str>`
[INFO] [stderr]     |
[INFO] [stderr]     = help: the trait `std::ops::AddAssign<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: cannot add-assign `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]    --> src/frontend/mod.rs:256:51
[INFO] [stderr]     |
[INFO] [stderr] 256 |                 CmarkEvent::InlineHtml(html) => s += &html,
[INFO] [stderr]     |                                                   ^^ no implementation for `std::string::String += &std::borrow::Cow<'_, str>`
[INFO] [stderr]     |
[INFO] [stderr]     = help: the trait `std::ops::AddAssign<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `heradoc`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0277]: cannot add-assign `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]    --> src/frontend/mod.rs:254:45
[INFO] [stderr]     |
[INFO] [stderr] 254 |                 CmarkEvent::Text(text) => s += &text,
[INFO] [stderr]     |                                             ^^ no implementation for `std::string::String += &std::borrow::Cow<'_, str>`
[INFO] [stderr]     |
[INFO] [stderr]     = help: the trait `std::ops::AddAssign<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: cannot add-assign `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]    --> src/frontend/mod.rs:256:51
[INFO] [stderr]     |
[INFO] [stderr] 256 |                 CmarkEvent::InlineHtml(html) => s += &html,
[INFO] [stderr]     |                                                   ^^ no implementation for `std::string::String += &std::borrow::Cow<'_, str>`
[INFO] [stderr]     |
[INFO] [stderr]     = help: the trait `std::ops::AddAssign<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `heradoc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "974fbed96d7b2bee6675ec801f65d21b162d0083c1269f9495f75550d6ce1c17"`
[INFO] running `"docker" "rm" "-f" "974fbed96d7b2bee6675ec801f65d21b162d0083c1269f9495f75550d6ce1c17"`
[INFO] [stdout] 974fbed96d7b2bee6675ec801f65d21b162d0083c1269f9495f75550d6ce1c17