[INFO] fetching crate yansi 0.5.0...
[INFO] checking yansi-0.5.0 against beta for pr-78714
[INFO] extracting crate yansi 0.5.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate yansi 0.5.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate yansi 0.5.0
[INFO] finished tweaking crates.io crate yansi 0.5.0
[INFO] tweaked toml for crates.io crate yansi 0.5.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ca633cdeea72044c7fd5087646e11db9fd18e65773ab8830d29f7f232219ad49
[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" "ca633cdeea72044c7fd5087646e11db9fd18e65773ab8830d29f7f232219ad49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca633cdeea72044c7fd5087646e11db9fd18e65773ab8830d29f7f232219ad49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca633cdeea72044c7fd5087646e11db9fd18e65773ab8830d29f7f232219ad49", kill_on_drop: false }`
[INFO] [stdout] ca633cdeea72044c7fd5087646e11db9fd18e65773ab8830d29f7f232219ad49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=forbid" "-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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8562d17ba6f675a8dc6ad5de7f8873c465e70866758a56496aa23ed66a9277d2
[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" "8562d17ba6f675a8dc6ad5de7f8873c465e70866758a56496aa23ed66a9277d2", kill_on_drop: false }`
[INFO] [stderr]     Checking yansi v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking owning_ref v0.3.3
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/parking_lot_core-0.2.14/src/lib.rs:41:60
[INFO] [stdout]    |
[INFO] [stdout] 41 | #![cfg_attr(all(feature = "nightly", target_os = "linux"), feature(integer_atomics))]
[INFO] [stdout]    |                                                            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/style.rs:185:52
[INFO] [stdout]     |
[INFO] [stdout] 185 | fn write_spliced<T: Display>(c: &mut bool, f: &mut fmt::Write, t: T) -> fmt::Result {
[INFO] [stdout]     |                                                    ^^^^^^^^^^ help: use `dyn`: `dyn fmt::Write`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/style.rs:412:38
[INFO] [stdout]     |
[INFO] [stdout] 412 |     pub fn fmt_prefix(&self, f: &mut fmt::Write) -> fmt::Result {
[INFO] [stdout]     |                                      ^^^^^^^^^^ help: use `dyn`: `dyn fmt::Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/style.rs:474:38
[INFO] [stdout]     |
[INFO] [stdout] 474 |     pub fn fmt_suffix(&self, f: &mut fmt::Write) -> fmt::Result {
[INFO] [stdout]     |                                      ^^^^^^^^^^ help: use `dyn`: `dyn fmt::Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/color.rs:73:44
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub(crate) fn ascii_fmt(&self, f: &mut fmt::Write) -> fmt::Result {
[INFO] [stdout]    |                                            ^^^^^^^^^^ help: use `dyn`: `dyn fmt::Write`
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `parking_lot_core`
[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] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "8562d17ba6f675a8dc6ad5de7f8873c465e70866758a56496aa23ed66a9277d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8562d17ba6f675a8dc6ad5de7f8873c465e70866758a56496aa23ed66a9277d2", kill_on_drop: false }`
[INFO] [stdout] 8562d17ba6f675a8dc6ad5de7f8873c465e70866758a56496aa23ed66a9277d2