[INFO] updating cached repository https://github.com/steveklabnik/rust-docs
[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] 81abec54cc31274c288bae774989f13991ed42b9
[INFO] checking steveklabnik/rust-docs against try#d7b51666469c792a8a3f40849607739bae1e705e for pr-71665
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteveklabnik%2Frust-docs" "/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/steveklabnik/rust-docs on toolchain d7b51666469c792a8a3f40849607739bae1e705e
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d7b51666469c792a8a3f40849607739bae1e705e" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/steveklabnik/rust-docs
[INFO] finished tweaking git repo https://github.com/steveklabnik/rust-docs
[INFO] tweaked toml for git repo https://github.com/steveklabnik/rust-docs written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/steveklabnik/rust-docs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d7b51666469c792a8a3f40849607739bae1e705e" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+d7b51666469c792a8a3f40849607739bae1e705e" "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] 26fb7bb14e34cfb727d9de69826dea0f7d6adfb4e8da32e0f5fbe701b1f6fa09
[INFO] running `"docker" "start" "-a" "26fb7bb14e34cfb727d9de69826dea0f7d6adfb4e8da32e0f5fbe701b1f6fa09"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking matches v0.1.4
[INFO] [stderr]    Compiling gcc v0.3.45
[INFO] [stderr]     Checking num-traits v0.1.37
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking unicode-normalization v0.1.4
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]     Checking futures v0.1.11
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]     Checking serde v0.9.11
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking rustc-serialize v0.3.23
[INFO] [stderr]     Checking httparse v1.2.1
[INFO] [stderr]     Checking slog v1.5.2
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking pest v0.3.3
[INFO] [stderr]     Checking quick-error v1.1.0
[INFO] [stderr]     Checking thread-id v3.0.0
[INFO] [stderr]     Checking iovec v0.1.0
[INFO] [stderr] error[E0277]: `core::fmt::Opaque` cannot be shared between threads safely
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-1.5.2/src/ser.rs:228:6
[INFO] [stderr]     |
[INFO] [stderr] 120 | pub trait SyncSerialize: Send + Sync + 'static + Serialize {}
[INFO] [stderr]     |                                 ---- required by this bound in `ser::SyncSerialize`
[INFO] [stderr] ...
[INFO] [stderr] 228 | impl SyncSerialize for fmt::Arguments<'static> {}
[INFO] [stderr]     |      ^^^^^^^^^^^^^ `core::fmt::Opaque` cannot be shared between threads safely
[INFO] [stderr]     |
[INFO] [stderr]     = help: within `core::fmt::Arguments<'static>`, the trait `core::marker::Sync` is not implemented for `core::fmt::Opaque`
[INFO] [stderr]     = note: required because it appears within the type `&'static core::fmt::Opaque`
[INFO] [stderr]     = note: required because it appears within the type `core::fmt::ArgumentV1<'static>`
[INFO] [stderr]     = note: required because it appears within the type `[core::fmt::ArgumentV1<'static>]`
[INFO] [stderr]     = note: required because it appears within the type `&'static [core::fmt::ArgumentV1<'static>]`
[INFO] [stderr]     = note: required because it appears within the type `core::fmt::Arguments<'static>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `slog`.
[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 `"docker" "inspect" "26fb7bb14e34cfb727d9de69826dea0f7d6adfb4e8da32e0f5fbe701b1f6fa09"`
[INFO] running `"docker" "rm" "-f" "26fb7bb14e34cfb727d9de69826dea0f7d6adfb4e8da32e0f5fbe701b1f6fa09"`
[INFO] [stdout] 26fb7bb14e34cfb727d9de69826dea0f7d6adfb4e8da32e0f5fbe701b1f6fa09