[INFO] fetching crate mental-poker 0.1.0...
[INFO] testing mental-poker-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate mental-poker 0.1.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate mental-poker 0.1.0 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 crates.io crate mental-poker 0.1.0
[INFO] finished tweaking crates.io crate mental-poker 0.1.0
[INFO] tweaked toml for crates.io crate mental-poker 0.1.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate mental-poker 0.1.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded structopt-derive v0.4.18
[INFO] [stderr]   Downloaded mockall v0.11.0
[INFO] [stderr]   Downloaded float-cmp v0.9.0
[INFO] [stderr]   Downloaded nom v7.1.0
[INFO] [stderr]   Downloaded test-log v0.2.8
[INFO] [stderr]   Downloaded structopt v0.3.26
[INFO] [stderr]   Downloaded env_logger v0.9.0
[INFO] [stderr]   Downloaded normalize-line-endings v0.3.0
[INFO] [stderr]   Downloaded difflib v0.4.0
[INFO] [stderr]   Downloaded downcast v0.11.0
[INFO] [stderr]   Downloaded fragile v1.1.0
[INFO] [stderr]   Downloaded assert_matches v1.5.0
[INFO] [stderr]   Downloaded semver v1.0.5
[INFO] [stderr]   Downloaded libc v0.2.118
[INFO] [stderr]   Downloaded unwrap-infallible v0.1.5
[INFO] [stderr]   Downloaded mockall_derive v0.11.0
[INFO] [stderr]   Downloaded predicates v2.1.1
[INFO] [stderr]   Downloaded predicates-core v1.0.3
[INFO] [stderr]   Downloaded termtree v0.2.4
[INFO] [stderr]   Downloaded predicates-tree v1.0.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d49efd8fdac82dcdb5f1f53ef0a8bb67e143d3f5f4ac5124c21e685f0d3715ab
[INFO] running `Command { std: "docker" "start" "-a" "d49efd8fdac82dcdb5f1f53ef0a8bb67e143d3f5f4ac5124c21e685f0d3715ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d49efd8fdac82dcdb5f1f53ef0a8bb67e143d3f5f4ac5124c21e685f0d3715ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d49efd8fdac82dcdb5f1f53ef0a8bb67e143d3f5f4ac5124c21e685f0d3715ab", kill_on_drop: false }`
[INFO] [stdout] d49efd8fdac82dcdb5f1f53ef0a8bb67e143d3f5f4ac5124c21e685f0d3715ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fc7c61fdd862365b9876d62a77ff568224b53be89bd81739e04cfb8d50ead2d5
[INFO] running `Command { std: "docker" "start" "-a" "fc7c61fdd862365b9876d62a77ff568224b53be89bd81739e04cfb8d50ead2d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.118
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling sha2 v0.10.2
[INFO] [stderr]    Compiling getrandom v0.2.4
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling mental-poker 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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(step_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(generic_const_exprs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(generic_associated_types)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(type_alias_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mental-poker` due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "fc7c61fdd862365b9876d62a77ff568224b53be89bd81739e04cfb8d50ead2d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc7c61fdd862365b9876d62a77ff568224b53be89bd81739e04cfb8d50ead2d5", kill_on_drop: false }`
[INFO] [stdout] fc7c61fdd862365b9876d62a77ff568224b53be89bd81739e04cfb8d50ead2d5