[INFO] cloning repository https://github.com/ArdusJax/dart-frog
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ArdusJax/dart-frog" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArdusJax%2Fdart-frog", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArdusJax%2Fdart-frog'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b232422671d4fde470d1c1b4418ef3c8b86d4264
[INFO] testing ArdusJax/dart-frog against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FArdusJax%2Fdart-frog" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ArdusJax/dart-frog on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ArdusJax/dart-frog
[INFO] finished tweaking git repo https://github.com/ArdusJax/dart-frog
[INFO] tweaked toml for git repo https://github.com/ArdusJax/dart-frog written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ArdusJax/dart-frog already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_derive v1.0.78
[INFO] [stderr]   Downloaded serde v1.0.78
[INFO] [stderr]   Downloaded serde_json v1.0.27
[INFO] [stderr]   Downloaded console v0.6.2
[INFO] [stderr]   Downloaded indicatif v0.9.0
[INFO] [stderr]   Downloaded unindent v0.1.3
[INFO] [stderr]   Downloaded termios v0.3.0
[INFO] [stderr]   Downloaded clicolors-control v0.2.0
[INFO] [stderr]   Downloaded colored v1.6.1
[INFO] [stderr]   Downloaded syn v0.15.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 086531cc73aeb89d6f6c333c783226cbcdff5ff85db32e7638f691cbe6666ca5
[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" "086531cc73aeb89d6f6c333c783226cbcdff5ff85db32e7638f691cbe6666ca5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "086531cc73aeb89d6f6c333c783226cbcdff5ff85db32e7638f691cbe6666ca5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "086531cc73aeb89d6f6c333c783226cbcdff5ff85db32e7638f691cbe6666ca5", kill_on_drop: false }`
[INFO] [stdout] 086531cc73aeb89d6f6c333c783226cbcdff5ff85db32e7638f691cbe6666ca5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 9df1875aeba28c1cd60e11cb024a8608167c578f15df44e6f73c10fea63ea6a2
[INFO] running `Command { std: "docker" "start" "-a" "9df1875aeba28c1cd60e11cb024a8608167c578f15df44e6f73c10fea63ea6a2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.19
[INFO] [stderr]    Compiling rand_core v0.2.1
[INFO] [stderr]    Compiling regex v1.0.5
[INFO] [stderr]    Compiling serde v1.0.78
[INFO] [stderr]    Compiling utf8-ranges v1.0.1
[INFO] [stderr]    Compiling ryu v0.2.6
[INFO] [stderr]    Compiling linked-hash-map v0.5.1
[INFO] [stderr]    Compiling dtoa v0.4.3
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling unindent v0.1.3
[INFO] [stderr]    Compiling memchr v2.0.2
[INFO] [stderr]    Compiling termios v0.3.0
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling clicolors-control v0.2.0
[INFO] [stderr]    Compiling smallvec v0.6.5
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling rand v0.5.5
[INFO] [stderr]    Compiling lock_api v0.1.3
[INFO] [stderr]    Compiling aho-corasick v0.6.8
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling colored v1.6.1
[INFO] [stderr]    Compiling yaml-rust v0.4.0
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.15.4
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling parking_lot v0.6.4
[INFO] [stderr]    Compiling console v0.6.2
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling serde_derive v1.0.78
[INFO] [stderr]    Compiling indicatif v0.9.0
[INFO] [stderr]    Compiling serde_yaml v0.7.5
[INFO] [stderr]    Compiling serde_json v1.0.27
[INFO] [stderr]    Compiling dart-frog v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(custom_attribute)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(custom_attribute)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/project/mod.rs:29:56
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn parse_plan(path: &String) -> Result<String, Box<Error>> {
[INFO] [stdout]    |                                                        ^^^^^ help: use `dyn`: `dyn Error`
[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/project/mod.rs:41:62
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn resolve_requirements(&self) -> Result<String, Box<Error>> {
[INFO] [stdout]    |                                                              ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/project/mod.rs:61:49
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub fn execute(&self) -> Result<String, Box<Error>> {
[INFO] [stdout]    |                                                 ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:35:44
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn run(path: String) -> Result<String, Box<Error>> {
[INFO] [stdout]    |                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dart-frog`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "9df1875aeba28c1cd60e11cb024a8608167c578f15df44e6f73c10fea63ea6a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9df1875aeba28c1cd60e11cb024a8608167c578f15df44e6f73c10fea63ea6a2", kill_on_drop: false }`
[INFO] [stdout] 9df1875aeba28c1cd60e11cb024a8608167c578f15df44e6f73c10fea63ea6a2