[INFO] cloning repository https://github.com/metaworm/easy-rpc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/metaworm/easy-rpc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] abdea55a0b278b68339a60ae6aba9b4d5f1d249b
[INFO] testing metaworm/easy-rpc against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc" "/workspace/builds/worker-58/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-58/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/metaworm/easy-rpc on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/metaworm/easy-rpc
[INFO] finished tweaking git repo https://github.com/metaworm/easy-rpc
[INFO] tweaked toml for git repo https://github.com/metaworm/easy-rpc written to /workspace/builds/worker-58/source/Cargo.toml
[INFO] crate git repo https://github.com/metaworm/easy-rpc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded smallvec v1.0.0
[INFO] [stderr]   Downloaded serde_bytes v0.11.3
[INFO] [stderr]   Downloaded memrange v0.1.3
[INFO] [stderr]   Downloaded tokio-executor v0.1.9
[INFO] [stderr]   Downloaded theban_interval_tree v0.7.1
[INFO] [stderr]   Downloaded tokio-reactor v0.1.11
[INFO] [stderr]   Downloaded downcast-rs v1.1.1
[INFO] [stderr]   Downloaded rmp v0.8.8
[INFO] [stderr]   Downloaded rmpv v0.4.2
[INFO] [stderr]   Downloaded shared_memory_derive v0.10.0
[INFO] [stderr]   Downloaded shared_memory v0.10.0
[INFO] [stderr]   Downloaded rmp-serde v0.14.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-58/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-58/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1addbec024ba03ed7d841a961c180afcace8df34af1cb143eeb42793106342e
[INFO] running `Command { std: "docker" "start" "-a" "e1addbec024ba03ed7d841a961c180afcace8df34af1cb143eeb42793106342e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1addbec024ba03ed7d841a961c180afcace8df34af1cb143eeb42793106342e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1addbec024ba03ed7d841a961c180afcace8df34af1cb143eeb42793106342e", kill_on_drop: false }`
[INFO] [stdout] e1addbec024ba03ed7d841a961c180afcace8df34af1cb143eeb42793106342e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-58/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-58/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a346280bb6d13b18520a996e41e6f948accf9a4aa50e0ce3af1179c6fff9c55f
[INFO] running `Command { std: "docker" "start" "-a" "a346280bb6d13b18520a996e41e6f948accf9a4aa50e0ce3af1179c6fff9c55f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling futures v0.1.29
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling smallvec v1.0.0
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]    Compiling safemem v0.3.3
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling sha1 v0.6.0
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling downcast-rs v1.1.1
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling lock_api v0.3.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling memrange v0.1.3
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.11
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling num_cpus v1.11.1
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling tokio-executor v0.1.9
[INFO] [stderr]    Compiling tokio-sync v0.1.7
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling rmp v0.8.8
[INFO] [stderr]    Compiling mio v0.6.21
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling rmpv v0.4.2
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling theban_interval_tree v0.7.1
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr]    Compiling tokio-reactor v0.1.11
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling websocket-base v0.24.0
[INFO] [stderr]    Compiling serde_bytes v0.11.3
[INFO] [stderr]    Compiling rmp-serde v0.14.2
[INFO] [stderr]    Compiling shared_memory_derive v0.10.0
[INFO] [stderr]    Compiling websocket v0.24.0
[INFO] [stderr]    Compiling shared_memory v0.10.0
[INFO] [stderr]    Compiling easy-rpc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(unboxed_closures, fn_traits)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 `easy-rpc` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "a346280bb6d13b18520a996e41e6f948accf9a4aa50e0ce3af1179c6fff9c55f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a346280bb6d13b18520a996e41e6f948accf9a4aa50e0ce3af1179c6fff9c55f", kill_on_drop: false }`
[INFO] [stdout] a346280bb6d13b18520a996e41e6f948accf9a4aa50e0ce3af1179c6fff9c55f